Effect of High Temperature on the Mechanical Strength of Bone Powder Concrete Mortar.

Document Type : Research Studies

Authors

1 Assistant Professor., Faculty of Engineering., Zagazig University., Zagazig., Egypt.

2 Professor of Faculty of Engineering., Al-Azhar University., Nasr City., Egypt.

Abstract

When building materials are subjected to fire and exposed to cooling, some changes may occur in their characteristics; such as phase transformation, weight loss, aggregate cement bond, etc., which directly reflects on its chemical stability and mechanical properties. The effect of high temperature on the compressive and tensile strengths of concrete mortar premixed with bone powder (B.P.) as an addition as weight percent of cement was experimentally investigated. The percentage additions of bone powder were 0% 5%, 10% and 15%. All mortar samples were prepared and cured in tap water for 28 days, then kept in a  laboratory atmosphere until the beginning of the test. The specimens were subjected to different target temperatures of 100, 200, 300, 400, 500 and 600°C. After reaching to the desired target temperature, the specimens were held at that temperature for 4 hours. After heating the specimens were allowed to cool at room temperature until the date of this test. The results showed that all mortar specimens exposed to high temperature suffered a significant decrease in both compressive and tensile strengths. Addition of bone powder for concrete mortar by 5% recorded the highest relative compressive and tensile strength compared to other addition ratios. The mass loss increased with increasing temperature up to 600°C and B.P.%. In addition, at temperature of 600°C, cracks appeared on the surface of specimens.

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