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Concrete is subject to changes in volume during and after the hardening period. This dimensional instability is of considerable importance to the construction industry, and the understanding of the nature of these changes is important for those using concrete as a construction material. These volume changes, if excessive, can result in high stresses and cracking, with resulting poor performance of the concrete. It is an important consideration whether the volume changes occur in hardened concrete or prior to hardening.
Chief, Research and Development, Lone Star Industries, Houston, Tex.