15312Differences from Normal Strength Concrete

To make high-strength concrete, more stringent quality control and more care in the selection of materials are needed. The microstructure and failure modes in compression of high-strength concrete are quite different from the normal-strength concrete.

From a microstructure point of view, the behavior of high-strength concrete is more like a homogeneous material. The extent of porosity in the transition zone is greatly reduced and thus almost eliminates the existence of the transition zone. Also, the amount of microcracking in high-strength concrete associated with shrinkage, short-term loading, and sustained loading is significantly less than in normal-strength concrete. As for the failure mode, high-strength concrete usually has a vertical crack going through the aggregate and shows a more brittle mode of fracture and less volumetric dilation.

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