Postfire Residual Strength and Morphology of Concrete Incorporating Natural Rubber Latex Exposed to Elevated Temperatures
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Te exposure of concrete to elevated temperatures is known to cause diverse severe damages in concrete composites. Hence,
measures to improve the performance of concrete during exposure to fre are continually proposed. Te present study
investigated the postfre residual strength and morphology of concrete incorporating natural rubber latex exposed to
elevated temperature. Four diferent concrete mixes were considered for the investigation, namely, a control sample made
without natural rubber latex, the second sample containing 1% natural rubber latex, the third sample containing 1.5%
natural rubber latex, and the fourth sample containing 3% of natural rubber latex. Te concrete samples (150 mm cubes and
100 × 200 mm cylinders) were exposed to varying temperatures 300°C, 800°C, and 1000°C, after the curing process.
Nondestructive tests using Schmidt rebound hammer and ultrasonic pulse tester were carried out on samples. Te
compressive strength and split-tensile strength of concrete cubes and cylinders, respectively, were determined. Micrographs and elemental distribution in the sample were studied using the scanning electron microscopy (SEM-EDX) apparatus. It could be seen from the results that the concrete strength properties reduced as the exposure temperature increased. Te results also showed that NRL could be sparingly utilized as a concrete admixture, at 1% content. Te performance of concrete was not stable at over 300°C when NRL addition was above 1%.
Keywords
T Technology (General), TA Engineering (General). Civil engineering (General)