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Effect of Percentage Volume of Basalt Fibers on Mechanical Properties of High Strength Concrete at Elevated Temperatures

Author(s):

Sutapalli Manikanta , Chaitanya College of Engineering; B. Madhuri, Chaitanya College of Engineering

Keywords:

Compressive Strength, Split Tensile Strength

Abstract

Concrete, the most common material used in construction. Concrete has high compressive strength but it is weak in tension as the cement holding the aggregate in place can crack, allowing the structure to fail. Concrete when exposed to elevated temperatures become ductile and cracks. To improve the ductility we add basalt fibers can withhold the concrete without cracking at elevated temperatures due to their high elastic modulus, resulting in excellent tensile strength. The major objective of this research is to evaluate mechanical properties like compressive strength and split tensile strength of basalt fibre concrete at elevated temperatures expose to 27áµ’C to 600áµ’C for every 200áµ’C interval and is maintained for 3 hours duration. In this study M65 grade of concrete is considered and basalt fibers are added at 0.1, 0.2, 0.3 percent by volume. The parameters tested are compressive strength and split tensile strength. The specimens of size 100mm X 100mm X 100mm cubes were casted for compression test and cylinders of size 300mm length X 150mm diameter were casted for split tensile strength test and are cured for 7 and 28 days. The heated specimens are cooled to room temperature to determine the residual compressive strength and split tensile strength of basalt fibre concrete. Addition of basalt fibre in concrete reduces the compressive strength gradually and increases split tensile strength up to 0.2% addition of basalt content at all temperatures, residual split tensile strength of basalt fibre reinforced concrete increased. Addition of 0.2% basalt fibre content resists the micro cracks which are developed under applied stress resulting in high tensile strength of concrete. By visual observation the spalling of basalt reinforced concrete is less when compared to conventional concrete.

Other Details

Paper ID: IJSRDV5I120535
Published in: Volume : 5, Issue : 12
Publication Date: 01/03/2018
Page(s): 863-867

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