Producers of high-strength concrete know what factors affect compressive strength and know how to manipulate those factors to achieve the required strength. Manufacture of high-strength concrete involves making optimal use of the basic ingredients that constitute normal-strength concrete. Likewise, there is not a precise point of separation between high-strength concrete and ultra-high performance concrete, which has greater compressive strength than high-strength concrete and other superior properties. Although there is no precise point of separation between high-strength concrete and normal-strength concrete, the American Concrete Institute defines high-strength concrete as concrete with a compressive strength greater than 6,000 psi. The primary difference between high-strength concrete and normal-strength concrete relates to the compressive strength that refers to the maximum resistance of a concrete sample to applied pressure. ![]() ![]() Two buildings in Seattle, Washington, contain concrete with a compressive strength of 19,000 psi. ![]() Over the past two decades, the development of high-strength concrete has enabled builders to easily meet and surpass this estimate. In the early 1970s, experts predicted that the practical limit of ready-mixed concrete would be unlikely to exceed a compressive strength greater than 11,000 pounds square inch (psi).
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