Abstract
The compressive and tensile strengths of concrete made in hot weather condition decreased due to loss of mixing water caused by high evaporation. One method to overcome the problem is the use of saturated fly ash aggregate. The water content in fly ash aggregate can flow out to the hardened cement paste to continue the hydration process. This “self-curing” mechanism could produce more hydration around the surface of fly ash aggregate which sub¬sequently increases concrete strength. Experimental study has been conducted in temperature of 20o to 40o with humidity of 70% for dry curing, water curing, and nearly 100% for fog curing. Effect of self-curing could be justified as the strengths of concrete using fly ash aggregates is higher than concrete using fly ash aggregates covered with silane agent, and crushed stone aggregates. Even in high temperature, the self-curing could increase the strengths of concrete due to bond strength around the surface of each fly ash aggregates.
Highlights
Water or moisture content in hardened concrete affects the concrete design, especially in hot-humid climate such as in tropical countries
Parts of mixing water would escape due to the natural process, such as evaporation, bleeding, and gel production due to unsatisfactory hydration which takes place during mixing of concrete, in fresh concrete and hardened concrete
The clearest evidence of self-curing effect is that the later-age strength of fly ash (FA) concrete is higher than crushed stone aggregate concrete
Summary
Water or moisture content in hardened concrete affects the concrete design, especially in hot-humid climate such as in tropical countries. Parts of mixing water would escape due to the natural process, such as evaporation, bleeding, and gel production due to unsatisfactory hydration which takes place during mixing of concrete, in fresh concrete and hardened concrete. This phenomenon would result in decrease of concrete strength. During the process of the movement of water, the whole body will become damp; and because of high humidity of air, the rate of drying is low This situation would support a continuous wet curing within the body of concrete. It is expected that the water to function in water curing comes from the free water already escaped as vapour around the container, and from water still existed within the body of specimen
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