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Recently, research has been conducted using fibers to reduce the explosive spalling of concrete. Assessmentsof the volume fraction of polypropylene fiber in high-strength and lightweight concrete has shownthat an optimum volume fraction of fiber reduces explosive spalling by discharging pore pressure andheat stress inside the concrete through the dissolution of fibers during exposure to high temperatures.In this study, we manufactured a high-strength polymer–cement mortar that can be used in repairs ofmany concrete structures by selecting three kinds of lightweight aggregate that have excellent heat interceptionperformance, combined with varying volume fractions of polypropylene fiber to reduce explosivespalling. We analyzed the thermal characteristics and physical and mechanical properties of the mortarat high temperature. The analysis of test results for compressive strength, flexural strength, thermal conductivity,and thermogravimetric showed that a mixture of expanded perlite with high thermal stabilityand 0.2% polypropylene fiber showed the best physical, mechanical, and thermal characteristics.
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