Temperature Effects on Strength-Maturity Relations of Mortar
Nicholas J. Carino and H. S. Lew
Appears on pages(s):
age-strength relation; compression tests; compressive strength;cubes; curing; hydration; mortars (material); setting (hardening).
Two questions are addressed: 1) What are the quantitative effects of curing temperature on the strength-maturity relations of concrete? 2) At what age will curing temperature no longer affect the strength-marrity relation? To answer the first question, mortar cubes were cast and cured at five different temperatures from 5 to 43 C, and compreson tests were performed at seven maturity values. A three-parameter regulation was used to represent the strength-maturity relations, while regression analysis was used to evaluate the coefficients. It was found at the parameters in the strength-maturity function for each curing condition varied systematically with temperature. To answer the second question, mortar cubes were cast and stored at 5 and 32 C; they were then transferred to a 23 C environment for subsequent curing. Compression tests were performed at five maturity values. Resulting data were analyzed to determine the age beyond which initial curing temperature no longer affected the strength-maturity relation. Results indicate that an alternative to the traditional appoach for computing maturity may exist which may better account for combined effects of temperature and time on the strength develpment of concrete.