摘要
采用等体积置换法,将4目(4.75 mm)、40目(0.425 mm)两种粒径橡胶微粒分别按10%、20%、30%取代细骨料配制橡胶混凝土,并进行单轴受压及四点弯曲荷载作用下变形性能试验,研究橡胶微粒粒径、掺量对混凝土压弯性能的影响。试验结果表明:橡胶混凝土的单轴抗压强度及弹性模量较基准混凝土均有大幅度的降低,但变形能力明显增加,当掺量为30%时,峰值应变可达到基准混凝土的1.66倍;弯曲荷载作用下,试件极限挠度呈明显的增长,抗折强度随掺量的增加逐渐降低。表明橡胶微粒降低混凝土强度,但可显著提高其变形性能。
10%,20%,30% fine aggregate are replaced by 4,40 mesh rubber particles separately in compound rubberized concrete by the same volume replacement method,and the uniaxial compression performance and the load-deflection curves of the specimens by the four-point flexure test are derived,the influence of rubber particles diameter and the admixture of concrete is also studied.The results show that rubber concrete＇s uniaxial compressive strength and elastic modulus are greatly reduced;if the admixture is 30%,the peak strain can reach 1.66 times that of the original concrete;under flexure loads,the limiting deflection of the specimens remarkably increased,and the flexural strength with the admixture of increase gradually reduced.It shows that rubber particles can reduce the strength of concrete,and greatly improve the deformation properties.
出处
《公路》
北大核心
2011年第9期186-190,共5页
Highway
关键词
等体积置换
橡胶混凝土
峰值应变
极限挠度
same volume replacement
rubberized concrete
peak strain
limiting deflection
