Influence of Path Dependency and Moisture Conditions on the Biaxial Compression envelope for normal weight concrete

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Title: Influence of Path Dependency and Moisture Conditions on the Biaxial Compression envelope for normal weight concrete

Author(s): Michael A. Taylor and B. K. Patel

Publication: Journal Proceedings

Volume: 71

Issue: 12

Appears on pages(s): 627-633

Keywords: biaxial loads; compressive strength; concrete; fineness modulus; loads (forces); mechanical tests; moist curing; moisture content.

Date: 12/1/1974

Abstract:
Using 2 in. (50 mm) cubical specimens, biaxial compression strength envelopes were obtained for three strengths of 3/8 in. (9.5 mm) MSA normal weight aggregate concrete-2 ksi, 3 ksi, and 5 ksi (140, 210, and 350 kgf/cm*) The desired stress state and partial elimination of friction were achieved by loading the specimensthrough l/l 6 in. (1.6 mm) diameter ball bearings and using a specially designed two-channel, closed-loop electro-hydraulic testing facility. Envelopes were obtained for specimens dried after a standard curing period and for specimens kept continually saturated. Further studies examined the envelopes obtained under different loading histories. Results indicate that: Saturated concrete has a larger biaxial compression failure envelope than dry concrete. For saturated concrete, sequential loading gives strengths which appear to be only minimally smaller than proportional loadings. This is in contrast to previous obser-vations on dry specimens of lightweight concrete. [Au-thors]