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Evaluation of Shrinkage-Cracking Characteristics of Structural Lightweight Concrete
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1969-10-01
[PDF-1.69 MB]
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Abstract:Tests were conducted to determine the effect of coarse aggregate type, cement content and curing environment on unrestrained volume changes and restrained shrinkage cracking behavior. Measurements of restrained shrinkage stress and ultimate tensile strength were made for purposes of comparing these properties with the above characteristics. Two synthetic lightweight aggregates, commercially produced in Texas and having widely different saturation characteristics were used along with a natural siliceous river gravel as coarse aggregates. After a five-day initial moist curing period, the specimens were placed in four different curing environments, a) 140F 25 percent R.H., b) 73oF 50 percent R.H., c) 73F 95 percent R.H., and d) 40F 92 percent R.H. Cement contents of 5.0, 6.0 and 6.5 sacks/cubic yard were used. Unrestrained volume changes were measured on standard type specimens (3x3x11.25 in.). Cracking was evaluated as the number of cracks occurring on a specimen 4x4x48 in. with a No.8 reinforcing bar through the center.
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