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Pavement slabs tend to be subjected to severe changes in temperature differentials as the top of the concrete heats and subsequently slowly cools relative to the bottom of the slab in phase with the surface temperature that rapidly undergoes daily changes in ambient temperature. Maintaining an optimal joint spacing in the design process can substantially control volumetric deformations and the resulting stresses induced by temperature and moisture gradients. Full depth cracks will form at mid span resulting from loading and environmental stresses.

This is a result of these concretes generally exhibiting little to no bleed water, thereby making them prone to plastic shrinkage. There are several things that can be done to reduce the length of time concrete is exposed to evaporation and the potential formation of plastic shrinkage cracks. 2 lbs/ft2/h) when decks may be placed. These limits are particularly important for concretes containing supplementary cements. If the evaporation rate is high, practitioners often consider delaying the placement.

Diamond, and N. Berke. Steel Corrosion in Concrete. Chapman & Hall, London, 1997. Berke, N. , and M. P. Dalliare. The Effect of Low Addition Rate of Polypropylene Fibers on Plastic Shrinkage Cracking and Mechanical Properties of Concrete, Fiber-Reinforced Concrete: Development and Innovations, ACI SP-142-2, 1994, pp. 19–41. , P. Acker, S. Rigaud, and B. Clavaud. Experimental Assessment of Chemical Shrinkage of Hydrating Cement Pastes. Presented at AUTOSHRINK’98, Hiroshima, 1998, E & FN SPON, London, 1999, pp.

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Control of Cracking in Concrete State of the Art by TRANSPORTATION RESEARCH BOARD


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