Abstract
Assuming precast concrete using expansion material, we will confirm the influence of curing conditions on the basic physical properties of mortar with regard to the free expansion coefficient, constraint expansion coefficient and strength, using two types of expansive materials widely used in Japan . As a result, it was confirmed that the higher the curing temperature, the higher the strength regardless of the addition of the expansion material. In addition, it was confirmed that both the free expansion coefficient and the constrained expansion ratio had an effect irrespective of the curing temperature of the lime type expansion material.
Highlights
In recent years, research results on the performance of various types of foamed concrete have been reported
As a result of comparing the difference in expansion ratio between the curing temperature of 20 ° C and 50 ° C, It was confirmed that the expansion coefficient of the lime type expansion material was larger than the expansion coefficient of the ettringite type expansion material.The reason why no additive was judged to have a high shrinkage ratio is that a lot of water came out from the mortar
It was confirmed that the expansion coefficient of the lime based foam material was about 4 times the expansion coefficient of the ettringite type expansion material at any temperature of 20°C and 50°C
Summary
Research results on the performance of various types of foamed concrete have been reported. We assumed precast concrete using expandable material focusing on free expansion coefficient and expansion coefficient, and confirmed the influence of curing conditions on basic physical properties of mortar using two main materials used in Japan . [20-32]
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