极限拉伸变形是表征混凝土抗裂性能的重要指标。通过轴心抗拉试验和压汞试验, 研究了橡胶集料掺量对混 凝土极限拉伸变形性能的影响。结果表明, 当橡胶集料掺量为10 kg / m3 、20 kg/ m3 和30 kg / m3 时, 试件破坏时的极 限拉应变分别为普通混凝土的21 97、41 11 和31 89 倍; 峰值应变分别是普通混凝土的1. 86、21 00 和21 68 倍。掺入 橡胶集料, 混凝土的极限变形能力提高, 即抗裂性能提高, 但橡胶集料掺量存在一个合理值, 超过该值后混凝土的极 限拉应变会减小。

Ult imate tension defo rmatio n is an impo rtant parameter to char acterizeatio n o f the cr acking resistance per formance of co ncr ete cr ack. Tensile streng th t ests and mer cur y intr usio n po res(MIP) t ests w ere perfo rmed to MIP hav e been carr ied out to indicateinv estigate the effect s o f rubber ag gr egates co ntent on the ult imate tension defo rmatio n per formance of co ncrete. T hat rubber has influence o n ultimate tensio n defo rmation o f concrete. T he results reveal show ed that w hen the r ubber agg reg ates co ntent is 10, 20, and 30 kg / m3 r espectively, the ultimate t ensio n defo rmation of rubber ag gr egates concrete is aboutas 2. 97 times, 4. 11 times, and 3. 89 times as that o f that of the o rdinary concrete, and t he peak strain of rubber ag gr egates co ncr ete is a2 bout 1. 86, 2. 00, and 2. 68 times of that o f the o rdinary co ncr ete. w hen rubber content is 10 kg / m3 , 20kg / m3 and 30 kg/ m3 ; The rubber has improvement on ultimate tension deformation of concrete improves with the adding o f rubber ag gregates, which also sug gests that the cracking resistance performance of concrete impr oves. How ever, there is a reasonable value for the rubber agg regates content, and the ultimate tension deformation of concrete decreases w hen the rubber aggregates content exceeds the reasonable value. when rub2 ber is reasonable. So rubber can increase ultimate tensio n deformation of concrete to impr ove concrete crack.

山东省省级水利科研及技术推广项目( SDSLKY2013021) ; 山东省自然科学基金( ZR2013EML007) ; 山东交通学院博士科研启动 基金; 山东交通学院科研基金( Z201336)