高温后玄武岩纤维混凝土力学性能试验研究

Experimental Study on Mechanical Properties of Basalt Fiber Concrete After High Temperature

研究了高温作用下素混凝土、玄武岩纤维混凝土、玄武岩-高吸水树脂混凝土及玄武岩-纤维素混杂纤维混凝土的力学性能,建立了高温作用后混凝土的抗压强度预测模型。结果表明:纤维的掺入能够提高混凝土的耐高温性能;对于抗压强度,玄武岩-纤维素混杂纤维混凝土的抗压强度值最高,400℃时,其抗压强度相较素混凝土提高了36.3%;对于抗折强度,玄武岩和高吸水树脂混掺对混凝土抗折强度的提升效果最优;建立的高温作用下混凝土抗压强度预测模型的精度较高。

The mechanical properties of plain concrete,basalt fiber concrete,basalt-superabsorbent resin concrete and basalt-cellulose hybrid fiber concrete after high temperature were studied,and the prediction models of compressive strength of concrete after high temperature were established.The results show that the addition of fiber can effectively improve the high temperature resistance of concrete.For compressive strength,the basalt-cellulose hybrid fiber concrete has the highest compressive strength,and at 400℃,its compressive strength is 36.3%higher than that of plain concrete.For flexural strength,the mixing of basalt and superabsorbent resin has the best effect on the improvement of the flexural strength of concrete.The established prediction models of compressive strength of concrete under high temperature have high accuracy.