Title:
Influence of Accelerating Admixtures on Strength Development of Concrete Under Wet and Dry Curing
Author(s):
T. Rezansoff and J. R. Corbett
Publication:
Materials Journal
Volume:
85
Issue:
6
Appears on pages(s):
519-528
Keywords:
accelerating agents; admixtures; age-strength relation; compressive strength; concretes; curing; tensile strength; Materials Research
DOI:
10.14359/2280
Date:
11/1/1988
Abstract:
Effect of calcium chloride or a chloride-based strength-accelerating admixture on the tensile and compressive strength development of concrete under both wet and dry curing was evaluated. Tension and compression tests were made at time intervals to 91 days. Tension tests included the split cylinder, the modulus of rupture, and a pullout test. Both strength-accelerated concretes showed reduction in the split cylinder tensile strength averaging 10 and 11 percent for wet and dry curing, respectively, at 91 days relative to the compressive strength, when compared to the tensile strength achieved for the nonaccelerated control concrete. A single equation such as ft = A(f'c)1/2 or t = b(f'c)2/3 for calculating tensile strength from the measured compressive strength is often given in concrete codes on the basis of tests on normal (nonaccelerated) concretes. This can lead to overestimation of the tensile strength for strength-accelerated concrete, since tensile strength acceleration may be much less than compressive strength acceleration with calcium chloride or a chloride-based accelerator. This is further complicated with dry curing since tensile strengths may drop significantly with time.