不同养护条件下钢纤维混凝土力学性能试验研究

Experimental Study on Mechanical Properties of Steel Fiber Reinforced Concrete under Different Curing Conditions

钢纤维混凝土是在普通混凝土中掺入乱向分布的短钢纤维所形成的一种新型复合材料。基于试验,研究分别在水和质量浓度为5%的NaCl溶液2种养护条件下,不同钢纤维掺量的混凝土试件在一定养护时间内的抗压强度及轴压应力-应变曲线。试验结果表明,混凝土抗压强度随养护龄期的增长而增大,相比在5%NaCl溶液中养护,在水中养护的钢纤维混凝土抗压强度更高。总体来说,混凝土在掺入钢纤维后抗压强度降低,但延性更好,能有效阻止混凝土内部微小裂缝的扩大延伸及大裂缝的生成,在一定程度上证明掺入钢纤维对混凝土抗氯盐侵蚀有利。

Steel fiber reinforced concrete(SFRC)is a new composite material formed by adding short steel fibers distributed randomly into ordinary concrete.Based on the experiment,the compressive strength and axial compressive stress-strain curves of concrete specimens with different steel fiber content cured in the solution of 5%NaCl and water were studied.The experimental results show that the compressive strength of concrete increases with the increase of time and age,and the compressive strength of steel fiber reinforced concrete cured in water is higher than that cured in 5%NaCl solution.Generally speaking,the compressive strength of concrete decreases after adding steel fiber,but its ductility is better,which can effectively prevent the expansion and extension of micro-cracks and the formation of large cracks in concrete.To some extent,it is proved that adding steel fiber is beneficial to the chloride corrosion resistance of concrete.