Abstract
This paper describes the effects of high temperatures on the strength characteristic of crushed limestone sand concrete (CLSC). To compare, natural (river) sand concrete (NSC) and CLSC specimens were exposed to the three different high temperatures. Visual color-change and weight loss were also carefully examined through the tests. The test results indicated that the decreasing rate of compressive strength of CLSC after exposure to high temperature is slightly lower than that of NSC while the splitting tensile strength of CLSC indicated a very similar rate compared to NSC. Therefore, the strength variations of crushed limestone sand concrete after exposal to high temperature can be similarly treated as that of the natural sand concrete. Also it can be seen that the CLSC can use 0.5 power law equation to represent the relationship between compressive and splitting tensile strength before and after exposal to high temperature.
Highlights
The use of crushed sand as a fine aggregate has gradually increased in concrete industry due to the supplying shortage of natural sand and the growing restrictions to get natural sand for environmental protection
The test results indicated that the decreasing rate of compressive strength of crushed limestone sand concrete (CLSC) after exposure to high temperature is slightly lower than that of natural (river) sand concrete (NSC) while the splitting tensile strength of CLSC indicated a very similar rate compared to NSC
An experimental program on the variations of strength characteristics of the crushed limestone sand concrete (CLSC) subjected to high temperature was conducted in order to provide one of comprehensive study of crushed sand concrete when compare to the natural sand concrete (NSC)
Summary
The use of crushed sand as a fine aggregate has gradually increased in concrete industry due to the supplying shortage of natural (river) sand and the growing restrictions to get natural sand for environmental protection. Akrout [4] et al investigated an experimental study on the effect of crushed limestone sand proportioning to the workability and the compressive strength of concrete. Four different cement types were used while maintaining a constant water/cement ratio, and examined the influence of limestone fines in crushed sand on concrete properties of strength, chloride-ion permeability and capillary water absorption. The test results showed that up to 15% of fines content in crushed sand could be used without adversely affecting concrete strength. An experimental program on the variations of strength characteristics of the crushed limestone sand concrete (CLSC) subjected to high temperature was conducted in order to provide one of comprehensive study of crushed sand concrete when compare to the natural sand concrete (NSC)
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