Time and Temperature Effects on Tensile, Bond, and Compressive Strengths

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Title: Time and Temperature Effects on Tensile, Bond, and Compressive Strengths

Author(s): N. J. Gardner and S. M. Poon

Publication: Journal Proceedings

Volume: 73

Issue: 7

Appears on pages(s): 405-409

Keywords: age-strength relation: bonding;compressive strength: concretes: curing;low temperature: moist curing:setting (hardening): tensile strength.

Date: 7/1/1976

Abstract:
Describes an experimental investigation into the relaytionship between bond strength, tensile strength, and cylinder strength of concretes made of Type I cement and Type II cement moist cured at 72 F (22 C) for 1, 3, or 7 days and then cured under exteneded low tempertaures of 55 F (13 C) and 35 F (2 C). Compression strength, tensile strength, and bond strength are all elated, and an increase in one is reflected similarly in the others. The coomonly assumed relationship that the tensile and bond strengths of concrete are proprtional to the 0.5 power of the cylidar strength with time was found to inaccurate. The tensile strength and bond strength were found to be proportional to the 0.8 power of the cylindar strength with respect to age. The longer the concrete is cured at 72 F (22 C) the higher the initial rate of gain of strength (up to 28 days). However, the longer the concrete is cured at 72 F (22 C) the lower the ultimate (3 month) strength of the concrete.