Abstract
The effect of high temperature and air cooling on the mechanical properties and microstructure of mortars incorporating manufactured sand (MS) and granite powder (GP) waste as river sand (RS) substitutes has been studied. Results of study on one type of each material show that the compressive strength, split tensile strength and flexural strength at room temperature are increased by the addition of MS and GP waste. A significant decrease in strength was recorded for all control, MS and GP incorporated mortar specimens after a 3-hour exposure to 700 °C heat. However, MS-incorporated specimens show higher residual strength than those with RS and GP. In addition, the material exhibits a stable structure state up to 500 °C, while exposure to higher temperatures results in a decomposition of hydration products. Microstructural analysis shows that the surface texture of MS particles has significant effect on mortar strength. X-ray diffraction, Fourier-transform infra-red and scanning electron microscopic techniques have been used for microstructural analysis.
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