混杂钢纤维水泥基材料的力学行为

Mechanical Behaviors of Hybrid Steel Fiber Reinforced Cementitious Composites

研究了微细钢纤维以及中等直径钢纤维混杂增强水泥基材料的力学行为.结果表明,在纤维体积分数一定的情况下,混杂钢纤维体系对水泥基材料抗折强度的改善作用可优于单一直径钢纤维.而且,不同直径钢纤维混杂还可显著提高水泥基材料的断裂能和弯曲韧性.普通纤维增强水泥基材料断裂破坏时裂缝为沿切口开展的单一贯穿裂缝,而混杂钢纤维增强的试件破坏时切口附近呈现多缝开裂的现象.采用适当体积比的两种尺度钢纤维混杂增强基体,制备出了综合力学性能优越的混杂钢纤维增强水泥基材料.

The mechanical behaviors of micro-diameter steel wool and medium-diameter steel hybrid fiber reinforced cementitious composites （HFRCC） were investigated. With a constant fiber volume fraction, hybrid fiber can improve the mechanical properties of cementitious composites more effectively than mono-diameter fiber. Hybrid fiber has distinct hybrid effects on bending strength, fracture energy, and fracture toughness of cementitious composites. The crack mode of ordinary FRCC is a runthrough crack along the notch tip, but the crack mode of HFRCC is multiple cracks near the notch tip. It＇s expected that, once the hybrid ratio of two different diameter fibers is tailored properly, HFRCC materials with general superior mechanical behaviors can be prepared.