Author Archives: Brent

Loss of Unit Density Zero-Slump Concrete CMUs

Hang in there to the end, I’ll get to the point, promise.

Every CMU starts with a mold that is loosely filled with zero-slump concrete.  The loose concrete is tamped down with much pressure, noise, and vibration until loose concrete becomes very dense concrete.  After curing you have a very dense, high quality, concrete paver, or retaining wall, or other CMU.  High density makes for strong CMUs.

How much compaction and density you achieve depends on several things.  Given the tamper head/shoe will try to press the unit to the same height (and therefore the same volume) every time it is critical that you put enough concrete in the mold.

What factors make it possible to put enough concrete in the mold to get a good dense unit?  What factors could interfere with filling the mold properly?

The wonderful machines that make CMUs can perform the exact same operations over and over.  So they fill the mold with the same motions time after time.  To a certain extent they can adjust the mold filling in response to changes in the height of the units.  What they can not do is adjust in response to changes in the density of the unit.  I should add, “to my knowledge”, they can not.

If our CMU machine is consistently performing the same mold fill motions every time the biggest variable becomes the zero-slump concrete itself.  How it flows through the various hoppers of the machine, how it drops out of the fill box, how it responds to vibration during fill and compaction.

There is much literature, many mix design tools, and a zilliion opinions about how to design a mix to flow, fill, compact, and look good as a CMU.   Lets not tackle that bottomless subject.  This is about time.

This is a reminder.  A reminder that when you get water, cement, and aggregates together you have clicked a stop watch.  You are under the gun.  Barring any extraordinary chemical intervention, those components are reacting, hydrating, and with time will hardened into concrete that will not run through your machine.  This is so basic, so obvious, that we forget to talk about it.  Why talk about such tacit information?

Why?  Because this hydration process is not like flipping a switch.  Here flowable, “CLICK”, here hard as a rock.  No big “BOOM”, oh, too late, hard concrete.  As the curing clock ticks there are periods of time where the concrete is fresh, it flows and fills great.  Later there are periods of time where the concrete just starts to change, the flow and fill are being negatively impacted, but it still goes through the machine.  Then it gets just plain hard, we can all recognize that and it’s not going anywhere fast.

The dangerous period for the CMU guy is the time after all is well and the units are great, but before the concrete is obviously too hard.  Usually this period of bad fill, poor compaction, and sub-par unit density starts at around 20 minutes and goes down hill from there.

This is not theory.  A producer was having trouble with the compression strength of some SRWs.  Some were good, some were, shall we say, not so good.  I saw cut the units as part of normal testing.  Being concrete curious I was looking closely at the matrix exposed by  the cut.  The units were a two color mix.  The charcoal parts were visibly less dense.  No petrographic analysis, just naked eye and you could see the difference.

When alerted to this the producer discovered that the units were about 1/3 charcoal and 2/3 base color.  The charcoal batch was sitting in the hopper much longer than the base color. Units made when the charcoal batch was fresh were OK.    Units that happened to be from the tail end of the charcoal batch were less dense and weak.  Switching to smaller charcoal batch size cured the problem.  Like magic!

I’ve found this “old concrete” thing more than just this once.  Dodo happens and everything else gets scrutinized first.  Aggregates, order of addition, mix time, cement, water content, and (God forbid) admix.  Pay attention to time.  It can run through the machine OK but still come out bad.  Operators at my example producer had no clue there was an issue. Keeping concrete fresh can save you many headaches.

Gentleman, start your stopwatches!

 

Top - Low Density Bottom - High Density

Top – Low Density
Bottom – High Density

 

 

 

Contec EC-55

DESCRIPTION

ConTec EC-55 is a integral water repellant admixture used in low slump concrete units such as architectural block, paving stones, SRW units, or masonry mortar. When used properly this unique formulation chemically reacts with concrete to prevent water penetration and control efflorescence. ConTec EC-55 enhances the color and appeal of all types of concrete products. When used in both mortar and masonry units EC-55 reduces water infiltration through masonry walls.

APPLICATION

Use ConTec EC-55 in all types of manufactured concrete in which the reduction of efflorescence and water permeability is desirable.

PACKAGING

ConTec EC-55 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 480 lbs (218 kg) and 265 gallon (1003 L) totes weighing 2400 lbs (1089 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….………..1.01 – 1.02
Viscosity at 77F, cps …………..… ….100—300
Weight per gallon ………………… …….. 8.5
% Volatile matter (NVM(1)) …………… 45-65

FEATURES / BENEFITS

● Increases hydrophobic properties and lowers absorption rates.
● Impedes the formation of primary and secondary efflorescence.
● Helps maintain color integrity throughout.
● Aids color development and can shorten production cycles.
● Improves compressive strength and density.

HANDLING / STORAGE

ConTec EC-55 should be stored at temperatures above 40°F (4.5°C) Care should be taken to prevent this product from freezing. Should EC-55 become frozen the resulting material will be unusable.

ADDITION RATES

The recommended dosage is 8 to 16 fluid ounces per hundred weight of cement for concrete paving stones and concrete roof tile. For SRW units and other architectural block higher dosage rates may be recommended. These dosage rates are estimated, your actual rate should be determined by testing. We recommend the assistance of an ICT technical representative to help you determine the proper dosage rate and order of addition for your particular process. Order of addition procedures can vary per facility. Never mix EC-55 with other admixtures before application.

MSDS

Winter’s Efflorescence Control Challenges

We should be leaving winter behind.  But all the CMUs that were put in the yard though the cold months are being shipped now.  With the proper precautions this doesn’t have to lead to efflorescence complaint calls.  (For those of you that stumbled upon this post CMUs are Concrete Masonry Units.  The target audience for this post is ICT’s customers and potential customers that operate plants that make CMUs.  CMUs include interlocking pavers, hardscape items like garden wall, outdoor fireplace and grill kits, patio stones, and large segmental retaining wall {SRW}.)

What goes wrong in the winter?  Cold batch temperatures.  If you are making concrete for a bridge you can bet DOT would be monitoring concrete and ambient temperatures very closely.  If minimum criterion are not met no concrete gets made.

It is easy to forget how important batch temperatures are in the CMU plant.  Water gets colder, aggregates going into the bins are very cold.

Once batch temperatures get down to 55 hydration chemistry starts to misbehave.  Parts of the chain of hydration reactions fail to do their job.  The part we worry about transforms efflorescence causing calcium hydroxide into hardened concrete.  There is always plenty of troublesome calcium hydroxide left over (about 10% of the weight of cement) but cold batch and curing temperatures can double the usual amount.

That causes trouble when winter production goes to the customer in the spring.

Energy is the answer in the form of heat.  Batch water can be heated to nearly boiling.  Aggregate bins should be topped off at end of shift and allowed to warm in the HEATED plant.  Aggregate bins can be steamed.  Stick a thermometer in the concrete and keep it 55F or warmer.  Keep curing chamber temps were they belong.  Best advice saved for last, use ICT admix.

A little heat will make sure your CMU’s get a warm reception this spring.

Regards,

Brent

Sieve Analysis

ICT Technical Service helps ICT customers with aggregate sieve analysis and mix design optimization.  Customers get a free copy of ICT’s sieve and mix design spreadsheet.

The spreadsheet archives sieve data, tracks sieve trends, auto-fits aggregates into mix design curves, calculates batch cost, and saves mix designs for later recall.

Sieve excel 2007

ConTec CS-640

DESCRIPTION

ConTec CS-640 sealer is an water-based emulsion of organomodified siloxanes/silanes. It is designed to give concrete tough, water-resistant properties. It excels on concrete roof tile and concrete pavements. ConTec CS-640 is proven effective on porous concrete masonry surfaces. Properly applied CS-640 aids in the prevention of moss and algae growth.

APPLICATION

Spray systems should be airless type. There is no need to over apply. Only one coat is required. Apply only when substrate and ambient temperatures are above 64 degrees F. High volume users may consider buying CS-640 concentrate. Consult your ICT representative about our automated inline mixing units.

PACKAGING

ConTec CS-640 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 480 lbs (218 kg) and 265 gallon (1003 L) totes weighing 2360 lbs (1070 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.00 – 1.02
Viscosity at 77F, cps ………… …..…. 100 max
Weight per gallon …………………. ….8.35 – 8.4
% Volatile matter (NVM(1)) ………… …… ~ 50

FEATURES / BENEFITS

● Deep penetrating.
● Good water repellency.
● Fast Drying – Reduces Blocking.
● Improves durability and chemical resistance.
● Reduces efflorescence on concrete products.
● Self cleaning effect.
● Excellent price/performance ratio.
● Can be applied on dry or green concrete.
● Tolerates heat accelerated drying.

HANDLING / STORAGE

ConTec CS-640 can be stored over a wide range of temperatures but should not be allowed to freeze. Should ConTec CS-640 freeze, it will not thaw to a usable product. Provide adequate ventilation with use.

APPLICATION RATES

Application rates can vary, depending on surface, from 100 to 500 square feet per gallon. Typical roof tile application rates average 9 grams per square foot. Optimum coverage rates vary with geographic area and the texture and composition of the surface being sealed. Always consult your ICT technical representative for recommendations for your application.

Call and ask for technical assistance at 908-453-2737 or email info@bestadmix.com.

PDF File

MSDS

ConTec CS-630

DESCRIPTION

ConTec CS-630 sealer is an aqueous fine particle acrylic co-polymer dispersion blend. It is designed to give concrete tough, water-resistant properties. It excels on concrete roof tile. ConTec CS-630 is proven effective on porous concrete masonry surfaces. Properly applied CS-630 aids in the prevention of moss and algae growth.

APPLICATION

Spray systems should be airless type. There is no need to over apply. Only one coat is required. Apply only when substrate and ambient temperatures are above 64 degrees F. High volume users may consider buying CS-630 concentrate. Consult your ICT representative about our automated inline mixing units.

PACKAGING

ConTec CS-630 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 480 lbs (218 kg) and 265 gallon (1003 L) totes weighing 2360 lbs (1070 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.00 – 1.02
Viscosity at 77F, cps ………… …..…. < 300
Weight per gallon ……………..…. ….8.65 – 8.7
% Volatile matter (NVM(1)) ………… …… ~ 50

FEATURES / BENEFITS

● Deep penetrating.
● Good water repellency.
● Fast Drying – Reduces Blocking.
● Improves durability and chemical Resistance.
● Reduces efflorescence on concrete products.
● Self cleaning effect.
● Excellent price/performance ratio.
● Extremely blush resistant

HANDLING / STORAGE

ConTec CS-630 can be stored over a wide range of temperatures but should not be allowed to freeze. Should ConTec CS-630 freeze, it will not thaw to a usable product. Provide adequate ventilation with use.

APPLICATION RATES

Application rates can vary, depending on surface, from 100 to 500 square feet per gallon. Typical roof tile application rates average 9—12 grams per square foot. Optimum coverage rates vary with geographic area and the texture and composition of the surface being sealed. Always consult your ICT technical representative for recommendations for your application.

MSDS

ConTec CS-620

DESCRIPTION

ConTec CS-620 sealer is an aqueous fine particle dispersion of acrylic polymer. It is designed to give all concrete masonry units tough, water-resistant properties. ConTec CS-620 is proven effective on porous concrete masonry surfaces. It can be applied in the field or on the dry side of the production line. ConTec CS-620 can be tinted using approved pigments.

APPLICATION

Spray systems should be airless type. There is no need to over apply. Only one coat is required. Apply only when substrate and ambient temperatures are above 64 degrees F. Maintain temp for 3 hours or until completely dry.

PACKAGING

ConTec CS-620 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 480 lbs (218 kg) and 265 gallon (1003 L) totes weighing 2400 lbs (1089 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… .….. 1.00 – 1.03
Viscosity at 77F, cps ………… …. …..…. < 400
Weight per gallon ………………… ….8.7 – 8.75
% Volatile matter (NVM(1)) ………… …… ~ 50
VOCs (lbs/gallon) ….……0.0 lb/gal or 0.0 lb/ton

FEATURES / BENEFITS

● Deep penetrating.
● Non yellowing.
● Fast Drying – Reduces Blocking.
● Improves durability and chemical resistance.
● Reduces efflorescence on concrete products.
● Extremely blush resistant.

HANDLING / STORAGE

ConTec CS-620 can be stored over a wide range of temperatures but should not be allowed to freeze. Should ConTec CS-620 freeze, it will not thaw to a usable product. Provide adequate ventilation with use.

ADDITION RATES
Application rates can vary, depending on surface, from 100 to 420 square feet per gallon. Optimum coverage rates vary per application and geographic area. Always consult your ICT technical representative for recommendations for your application.

MSDS CS620-15

Call and ask for technical assistance at 908-453-2737 or email info@bestadmix.com.

PDF File

ConTec CS-620C

DESCRIPTION

ConTec CS-620C sealer is an concentrated aqueous fine particle dispersion of acrylic polymer. It is designed to give all concrete masonry units tough, water-resistant properties. ConTec CS-620C is proven effective on porous concrete masonry surfaces. It can be applied in the field or on the dry side of the production line. ConTec CS-620C can be tinted using approved pigments.

APPLICATION

Dilute before using. Stir well. Spray systems should be airless type. There is no need to over apply. Only one coat is required. Apply only when substrate and ambient temperatures are above 64 degrees F. Maintain temp for 3 hours or until completely dry.

PACKAGING

ConTec CS-620C is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 480 lbs (218 kg) and 265 gallon (1003 L) totes weighing 2400 lbs (1089 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.00 – 1.02
Viscosity at 77F, cps ………… …..…. 100 max
Weight per gallon ……………………. ….8.4 – 8.5
% Volatile matter (NVM(1)) ….………… …… ~ 55
VOCs (lbs/gallon) ……..012 lb/gal or 2.9 lb/ton

FEATURES / BENEFITS

● Deep penetrating.
● Concentrate saves freight.
● Non yellowing.
● Fast Drying – Reduces Blocking.
● Improves durability and chemical resistance.
● Reduces efflorescence on concrete products.
● Extremely blush resistant.

HANDLING / STORAGE

ConTec CS-620C can be stored over a wide range of temperatures but should not be allowed to freeze. Should ConTec CS-620C freeze, it will not thaw to a usable product. Provide adequate ventilation with use. Store as concentrate in original sealer container until just before usage.

ADDITION RATES

Dilute to appropriate solids level before using. 20% final solids is common but solids from 10% to 33% can be used. Add potable water and mix well.

Application rates can vary, depending on surface, from 100 to 420 square feet per gallon. Optimum coverage rates vary with geographic area. Always consult your ICT technical representative for recommendations for your application.

MSDS

Call and ask for technical assistance at 908-453-2737 or email info@bestadmix.com.

PDF File

ConTec CS-605

DESCRIPTION

ConTec CS-605 sealer is an aqueous fine particle dispersion of acrylic polymer. It is designed to give all concrete masonry units tough, water-resistant properties. ConTec CS-605 is proven effective on porous concrete masonry surfaces. It can be applied in the field or on the dry side of the production line. ConTec CS-605 can be tinted using approved pigments.

APPLICATION

Spray systems should be airless type. There is no need to over apply. Only one coat is required. Apply only when substrate and ambient temperatures are above 64 degrees F. Maintain temp for 3 hours or until completely dry.

PACKAGING

ConTec CS-605 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 480 lbs (218 kg) and 265 gallon (1003 L) totes weighing 2400 lbs (1089 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.00 – 1.02
Viscosity at 77F, cps ………… …..…. 100 max
Weight per gallon …………………. ….8.4 – 8.5
% Volatile matter (NVM(1)) ………… …… ~ 80
VOCs (lbs/gallon) ……..012 lb/gal or 2.9 lb/ton

FEATURES / BENEFITS

● Deep penetrating.
● Non yellowing.
● Fast Drying – Reduces Blocking.
● Improves durability and chemical resistance.
● Reduces efflorescence on concrete products.
● Extremely blush resistant.

HANDLING / STORAGE

ConTec CS-605 can be stored over a wide range of temperatures but should not be allowed to freeze. Should ConTec CS-605 freeze, it will not thaw to a usable product. Provide adequate ventilation with use.

ADDITION RATES

Application rates can vary, depending on surface, from 100 to 420 square feet per gallon. Optimum coverage rates vary with geographic area. Always consult your ICT technical representative for recommendations for your application.

MSDS

Call and ask for technical assistance at 908-453-2737 or email info@bestadmix.com.

ConTec AE-407

DESCRIPTION

ConTec AE-407 is a liquid air-entraining admixture used to provide a suitable air-void system in concrete products. AE-407 is based on neutralized vinsol resin technology that is factory premixed into a ready to use solution for accurate dispensing.

APPLICATION

ConTec AE-407 may be used wherever the need for air-entrainment is required by specification. AE-80 meets ASTM C 260 requirements designed for use in low slump and precast products. Concrete durability research has established that proper air entrainment can reduce the effects of freeze thaw cycles in hardened concrete. AE-407 is effective and compatible with other admixtures in concrete. AE-407 can be useful in production of “Slump Block”.

PACKAGING

ConTec AE-407 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 485 lbs (220 kg) and 265 gallon (1003 L) totes weighing 2400 lbs (1089 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.01 – 1.02
Viscosity at 77F, cps ……….… …..…. 100 max
Weight per gallon …………………..…. ….8.4 – 8.5
% Volatile matter (NVM(1)) ……..……… …… ~ 85
Appearance ……….. . ….. Clear Amber Liquid

FEATURES / BENEFITS

● Improves workability and plasticity.
● Helps reduce bleeding, segregation and shrinkage in concrete.
● Improves resistance to freeze thaw cycles.
● Improves water permeability.
● Greatly improves the properties of precast concrete when used in conjunction with SR-550.

HANDLING / STORAGE

ConTec AE-407 can be stored over a wide range of temperatures but should not be allowed to freeze. Should AE-407 freeze, allow complete thawing before mixing by mechanical means. AE-407 has a minimum shelf like of 12 months. With proper storage conditions the shelf life can be greatly extended.

ADDITION RATES

The addition rates for AE-407 will vary depending on the mount of air needed for a given job condition. The components of mix design along with temperature are typical factors that effect the amount of AE-407 required. Consult your ICT representative for assistance.

Call and ask for technical assistance at 908-453-2737 or email info@bestadmix.com.

MSDS

ConTec AE-80

DESCRIPTION

ConTec AE-80 is a liquid air-entraining admixture used to provide a suitable air-void system in concrete products. AE-80 is based on neutralized vinsol resin technology that is factory premixed into a ready to use solution for accurate dispensing. Concrete durability research has established that proper air entrainment can reduce the effects of freeze thaw cycles in hardened concrete.

APPLICATION

ConTec AE-80 may be used wherever the need for air-entraiment is required by specification. AE-80 meets ASTM C 260 requirements designed for use in low slump and precast products. AE-80 is effective and compatible with other admixtures in concrete. AE-80 can be useful in production of “Slump Block”.

PACKAGING

ConTec AE-80 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 485 lbs (220 kg) and 265 gallon (1003 L) totes weighing 2380 lbs (1079 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.01 – 1.02
Viscosity at 77F, cps ………… …..…. 100 max
Weight per gallon …………………. ….8.0 – 8.5
% Volatile matter (NVM(1)) ………… …… ~ 85
Appearance …………….. Clear, Amber Liquid

FEATURES / BENEFITS

● Improves workability and plasticity.
● Helps reduce bleeding, segregation and shrinkage in concrete.
● Improves resistance to freeze thaw cycles.
● Improves water permeability.
● Greatly improves the properties of precast concrete when used in conjunction with SR-550.

HANDLING / STORAGE

ConTec AE-80 can be stored over a wide range of temperatures but should not be allowed to freeze. Should AE-80 freeze, allow complete thawing before mixing by mechanical means. AE-80 has a minimum shelf like of 12 months. With proper storage conditions the shelf life can be greatly extended.

ADDITION RATES

The addition rates for AE-80 will vary depending on the mount of air needed for a given job condition. The components of mix design along with temperature are typical factors that effect the amount of AE-80 required. Consult your ICT representative for assistance.

MSDS

Call and ask for technical assistance at 908-453-2737 or email info@bestadmix.com.

ConTec NC-537P

DESCRIPTION

ConTec NC-537P is a non-corroding, chloride free accelerator/plasticizer blend. It does not corrode metal block and paver pallets or machine parts. It promotes early strength development and ease of manufacturing in concrete masonry unit (CMU) mix designs. NC-537P helps offset the effects of cold weather by increasing hydration speed. It should be used year-round to shorten time between CMU manufacture and splitting or tumbling.

APPLICATION

ConTec NC-537P is compatible in all CMU mixes. It may be added to the mix on the sand or in the water.

PACKAGING

ConTec NC-537P is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 560 lbs (254 kg) and 265 gallon (1003 L) totes weighing 2750 lbs (1247 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.17 – 1.18
Viscosity at 77F, cps …………..… .…. 50—100
Weight per gallon ………………… ….….. 9.8
% Volatile matter (NVM(1)) ………… …… NA

FEATURES / BENEFITS

● Compatible with all types of Portland cement.
● Ideal in masonry units that will be split or tumbled shortly after manufacturing.
● Increases the early strength of a concrete mixture.
● Plasticizer component adds lubricity to mix.
● Consolidates accelerating and plasticizing admixes into one economical product.
● Easily dispensed with conventional admix dispensers.

HANDLING / STORAGE

ConTec NC-537P will freeze at approximately 23°F (-5°C), but can be completely restored by thawing and thorough agitation. It may cause irritation to eyes and skin upon contact. Proper protection should be worn.

ADDITION RATES

Dosage must be determined by in-plant testing and is usually in the range of 8 to 30 US fluid ounces per 100 pounds of cement. Your ICT sales representative will help you determine your exact dosage.

MSDS

Call and ask for technical assistance at 908-453-2737 or email info@bestadmix.com.

ConTec NC-505

DESCRIPTION

ConTec NC-505 is a non-corroding, chloride free accelerator. It does not corrode reinforcing steel or pre-stressed strands in concrete. It promotes strength development of the concrete and meets ASTM C 494 requirements as a type C admixture. NC-505 offsets the effects of cold weather by increasing hydration speed.

APPLICATION

ConTec NC-505 is compatible in concrete with all commercial air entraining admixtures. The amount used will depend upon the setting time of the non-admixture concrete and the temperature at placement. It may be added to the mix on the sand or in the water.

PACKAGING

ConTec AC-505 is available in 55 gallon (208 L) drums weighing 620 lbs (281 kg) and 275 gallon (1041 L) totes weighing 3150 lbs (1429 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F……..…… ….. 1.30 – 1.32
Viscosity at 77F, cps ……….…..… .…. 50—100
Weight per gallon ………………. ….….. 10.90
% Volatile matter (NVM(1)) …………. …… NA

FEATURES / BENEFITS

● Compatible with all types of Portland cement.
● Offers a significant reduction in corrosion to steel reinforcing.
● Increases the early strength of a concrete mixture.
● Designed for use in cold weather concreting.
● Shortens setting time for concrete.
● Easily dispensed with conventional admix dispensers.

HANDLING / STORAGE

ConTec NC-505 will freeze at approximately -15°C, but can be completely restored by thawing and thorough agitation. It may cause irritation to eyes and skin upon contact. Proper protection should be worn.

ADDITION RATES

The dosage range is 0.5 – 2.6 liters per 100Kg of cement. NC-505 at 0.78 – 0.98 liter per 100Kg of cement will reduce the setting time of typical Type I cement concrete by 2-3 hours (at 10°C) and a 25 to 50% increase in 3 day compressive strength is normally achieved.

MSDS

ConTec AC-501

DESCRIPTION

ConTec AC-501 is a ready to use liquid admixture formulated to provide set acceleration and .increased early strength development in concrete. AC-501 is comprised of Calcium Chloride with additional chemical enhancements, to improve its effectiveness.

APPLICATION

Use ConTec AC-501 in all zero-slump applications including gray block, architectural block, segmental retaining wall, pavers, roof tile, and slabs. AC-501 improves cement hydration may change the demand for batch water. For maximum product improvement always add batch water at the maximum allowed rate with your process.

PACKAGING

ConTec AC-501 is available in 55 gallon (208 L) drums weighing 620 lbs (281 kg) and 275 gallon (1041 L) totes weighing 3150 lbs (1429 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….………..1.31 – 1.32
Viscosity at 77F, cps ……………….………<50
Weight per gallon ……………………….. 10.90
% Volatile matter (NVM(1)) ………………N/A

FEATURES / BENEFITS

● Increases product early and final strength.
● Offsets the effect of low temperature on setting time and early strength.
● Shortens setting time and increases rate of strength development.
● Designed for use in cold weather concreteing.
● Cement hydration increases and helps raise and maintain temperature.

HANDLING / STORAGE

ConTec AC-501 can freeze at extremely low
temperatures, but can be restored by thawing and
thorough agitation. Always use cold water when
diluting calcium chloride solution. Leather clothing and shoes will be damaged by calcium chloride.

ADDITION RATES

The Dosage range for AC-501 is 7 to 18 US fl. Oz./100 lb. of cement. Please consult an ICT representative for further recommendations to determine the proper dosage rate and order of addition for your particular process. Order of addition procedures can vary per facility. Never mix AC-501 with other admixtures before application. Flush dispensing equipment before changing to or from any another admix.

ConTec SP-311

DESCRIPTION

ConTec SP-311 is a ready to use liquid plasticizing and swipe producing admixture for use in low slump concrete masonry units. It’s unique multi-component chemistry creates a moderate to high swipe appearance and minimizes both feed and compaction times with its lubricating properties. SP-311 improves compaction and density producing higher compressive strength and a less permeable surface.

APPLICATION

Use ConTec SP-311 in all types of manufactured concrete where moderate to high swipe is desired

PACKAGING

ConTec SP-311 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 490 lbs (222 kg) and 260 gallon (984 L) totes weighing 2390 lbs (1084 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.01
Viscosity at 77F, cps ……….…. 50 – 100
Weight per gallon ……………… … ….….. 8.4
% Volatile matter (NVM(1)) ……… 86 – 88

FEATURES / BENEFITS

● Produces a moderate to high swipe.
● Creates more defined edges improving overall appearance.
● Optimizes material flow which shortens overall machine cycle times.
● Increases compressive and flexural strength.
● Added components improve cement particle dispersion and hydration.
● Reduces mechanical abrasion in equipment.

HANDLING / STORAGE

ConTec SP-311 should be stored at temperatures above 35°F (2°C) Care should be taken to prevent this product from freezing. Should SP-311 freeze, warm till completely liquid then use mechanical agitation to reconstitute.

ADDITION RATES

The recommended dosage is 2 – 5 fl oz /100 lbs (130-325 mL/100kg) of cement. As with most plasticizers, water content should be monitored to achieve desired appearance. SP-311 is not a water reducer and should not be utilized as such. Please consult an ICT representative for further recommendations to determine the proper dosage rate and order of addition for your particular process. Order of addition procedures can vary per facility. Never mix SP-311 with other admixtures before application.

ConTec SP-307

DESCRIPTION

ConTec SP-307 combines a swipe agent with an effective mix lubricant and hydration aid. It’s unique chemistry creates a low to moderate swipe appearance while its lubrication properties minimize both feed and compaction times. SP-307 is ready to use liquid for use all low slump concrete masonry units. SP-307 improves compaction and density producing higher compressive strength and a less permeable units.

APPLICATION

Use ConTec SP-307 in all types of manufactured concrete where low to moderate swipe is desired. SP-307 is not a water reducer and should not be utilized as such.

PACKAGING

ConTec SP-307 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 490 lbs (222 kg) and 260 gallon (984 L) totes weighing 2390 lbs (1084 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.02- 1.04
Viscosity at 77F, cps …………..… .…. 75—150
Weight per gallon ………………… ….….. 8.6
% Volatile matter (NVM(1)) … ……… 12—17

FEATURES / BENEFITS

● Improves cement particle dispersion and hydration.
● Produces a low to moderate swipe.
● Increases compressive through better compaction and hydration.
● Optimizes material flow which shortens overall machine cycle times.
● Creates more defined edges improving overall appearance.
● Reduces mechanical abrasion in equipment

HANDLING / STORAGE

ConTec SP-307 should be stored at temperatures above 35°F (2°C) Care should be taken to prevent this product from freezing. Should SP-307 freeze, warm till completely liquid then use mechanical agitation to reconstitute.

ADDITION RATES

The recommended dosage is 2-5 fl oz /100 lbs (130-325 mL/100kg) of cement. As with most plasticizers, water content should be monitored to achieve desired appearance. Please consult an ICT representative for further recommendations to determine the proper dosage rate and order of addition for your particular process. Order of addition procedures can vary per facility. Never mix SP-307 with other admixtures before application.

ConTec SD-235

DESCRIPTION

ConTec SD-235 is a unique blend of dispersing aids that features cutting-edge polycarboxylate technology. It’s highly active formulation improves both cement and color pigment efficiency in all types of architectural and hardscape concrete units. SD-235 improves cement hydration and provides higher compressive strength in manufactured concrete products. Your ICT technical representative can help you design a mix that will used SD-235 to actually reduce manufacturing cost.

TECHNOLOGY

Cement particles stick together in clumps called agglomerations. This clumping prevents water from reaching all the cement. Use of ConTec SD-235 admix breaks up agglomerations to increase the cement surface area available for hydration. The increased surface area holds more water without slumping your mix.

PACKAGING

ConTec SD-235 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 485 lbs (220 kg) and 260 gallon (984 L) totes weighing 2425 lbs (1100 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…….….. 1.05 – 1.06
Viscosity at 77F, cps …………..…..…. 50—100
Weight per gallon ……………….……….….. 8.8
% Volatile matter (NVM(1)) ………….…..65- 85

FEATURES / BENEFITS

● Improves cement particle dispersion and hydration.
● Aids pigment particle dispersion improving color development.
● Increases compressive and flexural strength.
● Proper use can potentially reduce cement and pigment usage.
● Improves the compaction process enhancing finished density.

HANDLING / STORAGE

ConTec SD-235 should be stored at temperatures above 35°F (2°C) Care should be taken to prevent this product from freezing. Should SD-235 freeze, warm till completely liquid then use mechanical agitation to reconstitute

ADDITION RATES

The recommended dosage is 3 US Fluid Ounces per 100 weight of cement. In dry-cast concrete products SD-235 will increase the demand for water by 5% to 10% above normal addition rates. SD-235 is not a water reducer and should not be utilized as such. Please consult an ICT representative for further recommendations to determine the proper dosage rate and order of addition for your particular process. Order of addition procedures can vary per facility. Never mix SD-235 with other admixtures before application.

ConTec SD-231

DESCRIPTION

ConTec SD-231 is a unique blend of dispersing aids that features cutting-edge polycarboxylate technology. It’s highly active formulation improves both cement and color pigment efficiency in all types of architectural and hardscape concrete units. SD-231 improves cement hydration and provides higher compressive strength in manufactured concrete products. Your ICT technical representative can help you design a mix that will used SD-231 to actually reduce manufacturing cost.

TECHNOLOGY

Cement particles stick together in clumps called agglomerations. This clumping prevents water from reaching all the cement. Use of ConTec SD-231 admix breaks up agglomerations to increase the cement surface area available for hydration. The increased surface area holds more water without slumping your mix.

PACKAGING

ConTec SD-231 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 485 lbs (220 kg) and 260 gallon (984 L) totes weighing 2425 lbs (1100 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…….1.05 – 1.06
Viscosity at 77F, cps ………… ..….. 50—100
Weight per gallon ……………….…. ..….….. 8.8
% Volatile matter (NVM(1)) … …..…… ~ 85

FEATURES / BENEFITS

● Improves cement particle dispersion and hydration.
● Aids pigment particle dispersion improving color development.
● Increases compressive and flexural strength.
● Proper use can potentially reduce cement and pigment usage.
● Improves the compaction process enhancing finished density.

HANDLING / STORAGE

ConTec SD-231 should be stored at temperatures above 35°F (2°C) Care should be taken to prevent this product from freezing. Should SD-231 freeze, warm till completely liquid then use mechanical agitation to reconstitute

ADDITION RATES

The recommended dosage is 0.2% by weight of cement. In dry-cast concrete products SD-231 will increase the demand for water by 5% to 10% above normal addition rates. SD-231 is not a water reducer and should not be utilized as such. Please consult an ICT representative for further recommendations to determine the proper dosage rate and order of addition for your particular process. Order of addition procedures can vary per facility. Never mix SD-231 with other admixtures before application.

ConTec SD-209

DESCRIPTION

ConTec SD-209 is a unique blend of dispersing aids bringing calcium naphthalene sulfonate technology to a new level. It’s highly active formulation improves both cement and color pigment efficiency in all types of architectural concrete. SD-209 will also improve cement hydration and therefore provide higher compressive strength in manufactured concrete products.

APPLICATION

Use ConTec SD-209 in all types of manufactured concrete where improved cement and pigment dispersion is desired. SD-209 is a low viscosity liquid ready to use as received.

PACKAGING

ConTec SD-209 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 570 lbs (259 kg) and 260 gallon (984 L) totes weighing 2750 lbs (1247 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.2 – 1.22
Viscosity at 77F, cps …………..… .…. 50—100
Weight per gallon ………………… ….….. 10.0
% Volatile matter (NVM(1)) ………… …… ~ 55

FEATURES / BENEFITS

● Improves cement particle dispersion and hydration.
● Aids pigment particle dispersion improving color development.
● Increases compressive and flexural strength.
● Proper use can potentially reduce cement and pigment usage.
● Improves the compaction process enhancing finished density.

HANDLING / STORAGE

ConTec SD-209 should be stored at temperatures above 35°F (2°C) Care should be taken to prevent this product from freezing. Should SD-209 freeze, warm till completely liquid then use mechanical agitation to reconstitute

ADDITION RATES

The recommended dosage is 0.2% by weight of cement. In dry-cast concrete products SD-209 will increase the demand for water by 5 to 10% above normal addition rates. SD-209 is not a water reducer and should not be utilized as such. Please consult an ICT representative for further recommendations to determine the proper dosage rate and order of addition for your particular process. Order of addition procedures can vary per facility. Never mix SD-209 with other admixtures before application.

ConTec SD-205

DESCRIPTION

ConTec SD-205 is a unique blend of dispersing aids bringing calcium naphthalene sulfonate technology to a new level. It’s highly active formulation improves both cement and color pigment efficiency in all types of architectural concrete. SD-205 will also improve cement hydration and therefore provide higher compressive strength in manufactured concrete products.

APPLICATION

Use ConTec SD-205 in all types of manufactured concrete where improved cement and pigment dispersion is desired. SD-205 is a low viscosity liquid ready to use as received.

PACKAGING

ConTec SD-205 is available in bulk quantities or packaged in 55 gallon (208 L) drums weighing 570 lbs (259 kg) and 260 gallon (984 L) totes weighing 2750 lbs (1247 kg).

TYPICAL PROPERTIES

Specific Gravity at 77F…….…… ….. 1.19 – 1.21
Viscosity at 77F, cps …………..… .…. 50—100
Weight per gallon ………………… ….….. 10.0
% Volatile matter (NVM(1)) ………… …… ~ 55

FEATURES / BENEFITS

● Improves cement particle dispersion and hydration.
● Aids pigment particle dispersion improving color development.
● Increases compressive and flexural strength.
● Proper use can reduce cement and pigment usage.
● Improves the compaction process enhancing finished density.

HANDLING / STORAGE

ConTec SD-205 should be stored at temperatures above 35°F (2°C) Care should be taken to prevent this product from freezing. Should SD-205 freeze, warm till completely liquid then use mechanical agitation to reconstitute

ADDITION RATES

The recommended dosage is 0.2% by weight of cement. In dry-cast concrete products SD-205 will increase the demand for water by 5 to 10% above normal addition rates. SD-205 is not a water reducer and should not be utilized as such. Please consult an ICT representative for further recommendations to determine the proper dosage rate and order of addition for your particular process. Order of addition procedures can vary per facility. Never mix SD-205 with other admixtures before application.