Path Dependent Biaxial Compressive Testing of an All-Lightweight Aggregate Concrete

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Title: Path Dependent Biaxial Compressive Testing of an All-Lightweight Aggregate Concrete

Author(s): Michael A. Taylor, Arun K. Jain, and Melvin R. Ramey

Publication: Journal Proceedings

Volume: 69

Issue: 12

Appears on pages(s): 758-764

Keywords: biaxial loads;compression;compressive strength;failure mechanisms;lightweight aggregate concretes;lightweight aggregates;loads (forces);strains;stresses;test equipment;tests.

Date: 12/1/1972

Abstract:
Using 2-in. cubical specimens, biaxial compression-compression envelopes were obtained for three strengths of 3/8 in. (10mm) MSA all-lightweight aggregate concrete: 2 ksi, 3.5 ksi, and 5 ksi (140, 245 and 350 kgf/cm^2). The desired stress state and the elimination of fricition were achieved by loading the specimens through wire bristle compression platens in a specially designed two-channel, closed-loop, electro-hydraulic testing facility. In contrast to a previous investigation, the shape of the failure envelo was found to differ from that for regular weight concrete. Furthurmore, an investigation of the influence of loading path showed that two-step sequential loadings result in strengths significantly lower than those obtained by proportional loadings.