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Frequently Asked Questions about CleanCrete

Q: How does CleanCrete compare to regular concrete?
A: CleanCrete is equal to or better than regular concrete.

Q: How is CleanCrete better for the environment than regular concrete?
A: The reduced portland cement content and high use of post–consumer by–products avoids most of the CO2 emissions due to cement manufacturing. This helps in the fight against global warming.

Q: Does CleanCrete cost more than regular concrete?

A: We have engineered CleanCrete so that it can be competitively priced with regular concrete. Pricing may vary by market, distributor and mixer.

Q: Does CleanCrete qualify for LEED credits?
A. CleanCrete can help contribute toward LEED credits for your project, including credit toward Innovation in Design through its embodied energy savings. CleanCrete can also earn project LEED points in Materials & Resources for its recycled material content.

Q: How does CleanCrete install? Are there special instructions?
A: CleanCrete installs just like regular concrete. Normal concrete mixing equipment and processes for mixing, handling, placement and finishing.

Q: Is CleanCrete as strong as traditional concrete, both during curing phase and over time?
A: CleanCrete can exceed the performance of traditional concrete in compressive, tensile and flexural strength. Longevity is expected to be many times greater than traditional concrete due to the use of micro–fibers, pozzolans and small particles.

Q: CleanCrete Classic contains only 7.5% portland cement. How does this compare to regular concrete?

A: Concrete mixes commonly contain 12 to 17% cement, 10 to 15% water and 70% coarse and fine aggregates (crushed rock and sand). CleanCrete effectively cuts the use of portland cement in half. Depending on your project’s desired compressive strength properties and how quickly you need to reach design strength, you may be able to reduce the quantity of portland cement by 60 or more.

Q: Can waterproofing admixtures be added to CleanCrete (eg Hycrete or Xypex)?
A: Yes, but you’ll first want to consider that, compared to conventional concrete, the CleanCrete admixture makes CleanCrete much more impermeable to water. This naturally enhances durability and helps to protect steel reinforcement from water intrusion degradation. Because CleanCrete performs just like traditional concrete, you can use chemical waterproofing admixtures, if desired.

Q: What's the highest SRI (Solar Reflectance Index) rating I can achieve in using CleanCrete?  
A: CleanCrete’s SRI rating is the same as traditional concrete. Specifying CleanCrete will help a LEED-track project earn points in Sustainable Sites, Credit 7: Heat Island Effect. Concrete constructed using ordinary Portland cement generally has an SRI around 35. New concrete made with white Portland cement can have an SRI as high as 86. For comparison, new asphalt usually has an SRI of 0, and weathered asphalt has an SRI of approximately 6.

Q: Can white portland cement be used in lieu of traditional Portland cement?
A: Yes, but because much of the portland cement has been replaced in CleanCrete by other material, the dramatic lightening effects from white portland cement won’t be as dramatic as in conventional concrete.

Q:  Does concrete and CleanCrete absorb CO2?

A:  Slowly, over time, small amounts of the calcium hydroxide compound within any concrete will combine with atmospheric CO2 to form calcite. Mostly, this process occurs at the surface or within a few millimeteres of the surface, and it is known as "adsorption". There is new, yet somewhat anecdoctal, evidence that other compounds within concrete will also absorb CO2—in even smaller amounts. The cement industry is making much of this news, but the truth is the amounts of CO2 that can be adsorbed and absorbed are mere trifles compared to the emissions produced through the manufacture of cement. These emissions will always outpace CO2 uptake through adsorption and absorption.

Q:  Can CleanCrete be used in structural columns, beams, footings, retaining walls and shear walls?
A:  Yes, the various CleanCrete mix formulations address the varying structural applications of any given project.  Depending on the compressive, tensile and flexural strength required for a job, we have a mix which can exceed the structural capabilities of conventional concrete.

Q:   Is there a listing of completed projects, as well as names of architectural and engineering firms on those projects, that might be available for us to contact regarding your product?
A: We are happy to provide contacts with architects, engineers and builders who have experience with CleanCrete. Please contact us to request more information.

Q: When will CleanCrete be available in my area?
A: CleanCrete is sold by authorized pre-mixers and certified ready-mixers. To see a current list of sources, visit our Where to Buy page. If you are interested in becoming an authorized CleanCrete pre-mixer or certified CleanCrete ready-mixer, use our Contact Form to request more information.

     
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