Abstract
Blending a certain proportion of basalt fiber into concrete improves the toughness of concrete, which prevents cracking and avoids the brittle behaviors. In this paper, the compressive, tensile, and flexural tests of concrete with different basalt fiber contents were carried out. Then the test phenomena, failure modes, and mechanical properties were compared and analyzed to derive the relationship between the basalt fiber contents and mechanical properties. The toughness and crack resistance performance of basalt fiber reinforced concrete were evaluated by the fracture energy, advanced toughness parameters, and characteristic length proposed by Hillerborg. The correlation coefficient of basalt fiber was introduced to establish the calculation formula for mechanical properties of basalt fiber reinforced concrete. The results indicated that basalt fiber significantly improved the toughness and crack resistance performance of concrete. The enhancing effect of the basalt fiber on the compressive strength of concrete is lower than that of tensile strength and flexural strength. Moreover, the improvement effect was the highest with the basalt fiber content was 0.3% and 0.4%.
Highlights
Concrete has the advantage of high compressive strength, superior corrosion resistance, and relatively lower cost, it is still the most widely used building material in the world.as one type of artificial brittle materials, concrete is relatively insufficient in terms of tensile strength, bending resistance, impact resistance, and toughness
The toughness and crack resistance performance of basalt fiber reinforced concrete were evaluated by the fracture energy, advanced toughness parameters, and characteristic length proposed by Hillerborg and the best volume content was obtained
The results show that the compressive strength of concrete has not been significantly improved by the incorporation of basalt fiber
Summary
Concrete has the advantage of high compressive strength, superior corrosion resistance, and relatively lower cost, it is still the most widely used building material in the world. As one type of artificial brittle materials, concrete is relatively insufficient in terms of tensile strength, bending resistance, impact resistance, and toughness. In the past two decades, blending fibers into concrete has been widely applied in some projects [1,2,3,4,5,6], such as railway sleepers, dams, and airport sidewalks. Researchers had investigated the fiber concrete by blending it with polypropylene fiber, polyvinyl alcohol fiber, steel fiber, glass fiber, and carbon fiber in order to improve the tensile strength, bending resistance, and impact resistance of concrete. The toughness and crack resistance of concrete had been improved [7,8,9,10,11]
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