A study of the relationships between time, strength, deformation and fracture of plain concrete

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Abstract
Synopsis A review of previous work shows that the relationship between compressive strength and rate of strain for concrete is dependent upon curing conditions, strength and age. Tests are reported in which for strain rates slower than 2·5 7times; 10−4/s the strength of concrete was independent of strain rate. The applicability to concrete of a criterion recently established for a sandstone is examined. This criterion is based upon the incremental Poisson's ratio and defines the critical stress of concrete. The use of cored and sawn concrete cylinders produced uniform fracturing of test specimens and facilitated the study of fracture patterns resulting from varying strain rates and load histories.

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