Concrete Expansion

The History of Recoveries
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The History of Recoveries

This recovery's strength may surprise you. More

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Cause of Cracks in Hollowcore Panel Topping

We supplied 4x24-foot hollowcore slabs for a building floor that received a 2-inch-thick concrete topping placed by the concrete contractor. Part of the building was left unfinished for later use, and, when it was built out, the owner noticed a crack that was visible on the topping surface but not on the underside of the hollowcore members, which are visible from the floor below. The relatively straight crack was parallel to the longitudinal dimension of the hollowcore slab and was up to 0.06 inch in width, up to 2 inches deep, and at least 20 feet long. It ran under a partition wall that had just been built, so I couldn't get a more accurate length estimate. The owner is concerned that the crack was caused by a structural overload during the build-out process and wants assurances that the building doesn't have a structural problem. What do I tell the owner? More

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Is ASR Expansion Linearly Related to Amount of Expansive Material?

We want to buy a jig to float out some of the opaline shale in our sand source. The shale is reactive and we need to reduce the expansion when the sand is tested by either ASTM C 1260, "Standard Test Method for Potential Alkali Reactivity of Aggregate," or C 1293, "Standard Test Method for Concrete Aggregates by Determination of Length Change of Concrete Due to Alkali-Silica Reaction." Is there any data to show how much you would reduce expansion if you reduced the percentage of reactive material in the sand from say 3% to 1.5%? More

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Technology Improves Efficiency of Central Mix Plants
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Don't Miss the Civic Center Expansion Boom
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