Variablility and Mean Value of Strength of Concrete as Function of Load


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Title: Variablility and Mean Value of Strength of Concrete as Function of Load

Author(s): B. Zech and F. H. Wittmann

Publication: Journal Proceedings

Volume: 77

Issue: 5

Appears on pages(s): 358-362

Keywords: dynamic loads; dynamic tests; flexural strength; impact; impact strength; impact tests; loading rate; loads (forces); mortars (material); shock resistance; variablility.

Date: 9/1/1980

Properties of concrete under high rate of loading have gained increasing interest in recent years. Experiments to study the influence of rate of loading on flexual strength of mortar bars are described. Bending of the bars which are loaded by a falling missile is measured by means of a transient recorder. The ultimate stress and strain at failure are determeined. A high and a low strength mortar have been tested. A theoretical approach publiched earlier explains satisfactorily the experimental findings. Within the reached range of accuracy it is found that the coeffiecinet of variability of strength of mortar remains unchanged as the rate of loading increases.