Cementitious Materials and Pozzolans

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The Fly Ash Threat

Designation as hazardous waste could turn concrete's environmental image on its head. More

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Admixture or Additive?

Q. In the past few years, we have noticed that mix design specifications have... More

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Lafarge Secures New Marketing Agreements to Meet Growing Customer Demand for Full-Service Fly Ash Programs in North Texas

Beginning January 1, 2009, company's local technical sales team will offer high-quality fly ash from AEP's Welsh and Oklaunion power plants to customers throughout region. More

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Help in Leed Certification

Changes in the point system are on the way. More

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TCP's 2008 GreenSite Awards

CONCRETE PRODUCER, with our sister publication, CONCRETE CONSTRUCTION, introduced the GreenSite Project of the Year con contest honoring the concrete community's efforts to promote concrete's role in creating eco-friendly structures that will stand the test of time. More

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An Aggregate Replacement

The synthetic aggregate market is a $2 billion industry in the United States, with... More

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An Alternative for Infill Wall Systems

Recently, researchers at the University of Missouri-Rolla investigated the... More

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Controlling Entrained Air Content

We have started having problems with variations in air content of our air-entrained mix designs. Air content stays uniform for a while, then goes out of the specification range. Usually, measured air content is too low, but sometimes we get exceptionally high values. I know that many factors affect air content. Is there a systematic method for tracking down the problem? More

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Lightening Hardened Concrete

We’ve been asked to bid on an upcoming concrete bridge deck. The project requires a hardened concrete that will resist corrosion. Normally on jobs like this we recommend micro-silica. But in this case, there’s a catch. The bridge is part of a high-profile project that features decorative concrete sidewalks and architectural precast panels. The designer wants a brighter surface on the bridge deck. Is there a way to lighten the concrete? More

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Was it too late to revibrate?

We watched a concrete pour where concrete was revibrated after it had set up. The vibrator head did not "readily penetrate" the concrete as described in ACI 309. In fact the inspector said "it took 15 to 30 seconds of vibrating at each pass for the probe to enter the older concrete." The "older" concrete had been placed two hours earlier. What happened in the concrete as it was revibrated and would it have been better to leave the concrete as it was without revibrating and place a cold joint? More

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