Abstract
Worldwide, concrete is the most preferred construction material. The steam curing method is favored when there is a need for accelerating strength. This paper presents the study of the compressive and flexural tensile strength of concrete subjected to eight different steam cures. In addition, the stress-strain curve and the modulus of elasticity were determined at the age of 28 days. The compressive strength test results show that after treatment, strength increases with concrete maturity. A cycle with a pre-heating period gives better results than a cycle without a pre-heating period. The longer the duration of the maximum temperature period, the lower the strength drop compared to the control concrete. The best results were obtained for concrete treated according to the following cycle: a 3-hour pre-heating period at 20oC, a 2-hour increase of temperature from 20 to 70oC, and a 3 hour of maximum temperature of 70oC.
Highlights
Concrete is extensively used as a construction material and, globally, it is the second highest consumed material [1]
Twelve 100mm cubes were made to determine the compressive strength and two 300×150mm diameter cylindrical specimens were used to determine the static modulus of elasticity
Strength compared to control concrete at 28 days, which is in agreement with the results in [19]
Summary
Concrete is extensively used as a construction material and, globally, it is the second highest consumed material [1]. Authors in [7] showed that 85°C is the optimum temperature in order to obtain high early strength. Authors in [8] demonstrated the improved early-age strength of high performance concrete through steam curing. Authors in [9] showed that as the temperature increases, the compressive and flexural strength of concrete at early age increase. Steaming leads to a reduction of 20 to 30% of the creep compared to the same concrete, cured at room temperature and loaded with equal stress/strength ratio [16]. This reduction in creep has been confirmed by [5, 12]
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