纤维格栅增强水泥混凝土的弯曲力学特性

为研究纤维格栅类型、纤维格栅表面处理及粗集料最大粒径对水泥混凝土弯曲力学特性的影响,对14组150 mm× 150 mm ×600 mm的水泥混凝土试件进行了四点弯曲试验,分析了试件破坏过程,探讨了纤维格栅与水泥混凝土相互作用的力学机理,提出了纤维格栅使用的若干建议.结果表明:试件属于脆性破坏；纤维格栅明显改善了水泥混凝土的弯曲力学特性,使水泥混凝土的抗弯强度提高6.62％ ～31.40％；与粗集料最大粒径为40mm时相比,粗集料最大粒径为20mm时,水泥混凝土的抗弯强度提高2.72％ ～9.97％；纤维格栅表面经环氧树脂处理后,试件的抗弯强度提高8.30％ ～ 11.88％.

Bending Mechanical Properties of Cement Concrete with Fiber Grid Reinforcement

In order to investigate the influence of fiber grid type,surface treatment and coarse aggregate limiting grain size on bending mechanical properties of cement concrete,fourteen group specimens with dimensions of 150 mm×150 mm×600 mm were tested through four-point bending experiments.The failure processes of the specimens were analyzed,the mechanical mechanism of the interaction between fiber grid and cement concrete was discussed,and some suggestions about the use of fiber grid were proposed.The research result shows that brittle failure characterizes the damage of the specimens.Fiber grid greatly improves the bending mechanical properties of cement concrete,and the bending strength of cement concrete is improved by 6.62% to 31.40%.When coarse aggregate limiting grain size is 20 mm compared with 40 mm,the bending strength of cement concrete increases by 2.72% to 9.97%.The bending strength of cement concrete is improved by 8.30% to 11.88% when fiber grid surface is treated with epoxy resin.