Concrete with compressive strength up to 140 MPa (20000 psi) can be now economically produced. For these high strength concretes it has been shown that one cannot use the same empirical relationships between compressive strength and other properties such as split cylinder strength, flexural strength, shear strength and bond strength as that currently used, and different relationships for high strength concrete have been proposed. In this paper a fracture mechanics based theoretical model is used to predict various experimentally observed trends for high strength concrete. The size independent fracture parameters needed for this model can be derived from a single test. It is known that an increased loading rate increases the strength but reduces the nonlinearity (increased 'brittleness'). This strain rate sensitivity of fracture strength of concrete is generally lower for high strength concrete. This interaction between high strength concrete and strain rate and between test method and size of the specimen can be predicted using the fracture mechanics approach proposed in the paper.
|Original language||English (US)|
|Title of host publication||Unknown Host Publication Title|
|Editors||Surendra P. Shah, Stuart E. Swartz|
|Publisher||Soc for Experimental Mechanics Inc|
|Number of pages||18|
|State||Published - Dec 1 1987|
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