Experimental Study On Mechanical Properties Of Basalt Fiber Reinforced Concrete After High Temperature

With the frequent building fire,the performance of concrete has different degrees of injury after high temperature and the safety of structure is threatened. Studies have shown that basalt fiber can improve the mechanical properties and degeneration performance of concrete and increase the concrete’s ductility and reduce concrete’s cracks at room temperature. The articles have carried on the test of the BFRC’s mechanical properties in order to explore the performance of BFRC after high temperature and mainly studied cube compressive strength 、 axial compressive strength、splitting strength、axial compressive stress-strain curve and burning loss rate after high temperature. The main research results are as follows:1. With the increasing of temperature, BFRC’s cube compressive strength and splitting strength firstly increases and then reduces; The axial compressive strength gradually decreases; The peak stress gradually decreases and peak strain gradually increases;The burning loss rate gradually increases.2. With the increasing of basalt fiber volume ratio, BFRC’s cube compressive strength axial compressive strength and splitting strength firstly increases and then reduces; The peak stress and peak strain firstly increases and then reduces; The burning loss rate firstly increases and then reduces.3. When the length of BF is 18 mm BFRC’s cube compressive strength 、 axial compressive strength、splitting strength、peak stress and peak strain are higher than the other strength when the length of BF is 6mm and 30mm;When the length of BF is 18 mm BFRC’s burning loss rate are lower than the other burning loss rate when the length of BF is 6mm and 30 mm.4. When the grade of concrete is C60 BFRC’s cube compressive strength、axial compressive strength、splitting strength、peak stress and peak strain are higher than the other strength when the grade of concrete is C30;Before 600℃ when the grade of concrete is C60 BFRC’s burning loss rate are higher than the other burning loss rate when the grade of concrete is C30 and after then.