新型金属化改性法对橡胶混凝土性能的影响

Effect of new metallization modification method on property of rubber concrete

金属化改性法是一种全新的橡胶改性方法。采用抗压强度、抗折强度、荷载-挠度试验,研究金属化改性法对橡胶混凝土力学性能、弯曲韧性的改性效果,并对比分析金属化改性法与丁苯胶乳、偶联剂等传统改性法的改性效果。结果表明,金属化改性法能够大幅度提高混凝土的弯曲韧性;金属化改性后的橡胶混凝土跨中挠度较未掺橡胶的混凝土增长530%,相比未改性橡胶混凝土28 d抗压强度提升40%、抗折强度提升25%左右;金属化改性法在混凝土力学性能、弯曲变形等方面的改性效果优于丁苯胶乳、偶联剂等传统改性法,跨中挠度增长达320%,28 d抗压强度衰减率降低50%~75%。

The metallization modification method is a new method of rubber concrete modification.We use compressive strength,flexural strength,and load-deflection tests to study the modification effect of mechanical,bending,and deflection properties of rubber concrete by the metallization modification method,and compare and analyze the modification effect between the metallization modification method and the traditional modification methods such as styrene-butadiene latex and coupling agent.The results show that the metallization modification method can greatly improve the bending toughness of concrete.The mid-span deflection of metallization modification rubber concrete grows 530%than that of unmixed rubber concrete,compares to the unmodified rubber concrete 28 d compressive strength increases by 40%,and flexural strength increases by about 25%.The metallization modification method in the mechanical property of concrete,bending deformation,and other aspects of the modification is better than the butyl rubber latex,coupling agent,and other traditional modification methods.The mid-span deflection increases by up to 320%,28 d compressive strength decay rate decreases by about 50%to 75%.