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由于橡胶颗粒较轻,橡胶集料混凝土在振捣密实时橡胶颗粒存在上浮现象。对不同振捣时间成型的混凝土,进行了湿体积密度、强度及颗粒均质性的对比试验。结果表明,机械振捣时间少于30s,抗压和劈拉强度都小于人工插捣成型的混凝土,且振捣时间越短,强度越低。当振捣时间为30s时,劈拉强度达到最大值。振捣时间在30～60s范围内,抗压强度随振捣时间的延长而逐渐提高,且强度增长的幅度逐渐增大,但劈拉强度却是递减的;随振捣时间的延长,体积密度逐渐增大,橡胶颗粒上浮现象逐渐明显。橡胶集料混凝土的适宜振捣时间为30～40s。
As the rubber particles lighter, rubber aggregate concrete in the vibrating compact rubber particles floating phenomenon. Contrast tests of wet bulk density, strength and particle homogeneity were carried out on concrete with different vibrating time. The results show that the mechanical vibrating time is less than 30s, the compressive strength and splitting tensile strength are less than those of artificial plugged concrete, and the shorter the vibrating time, the lower the strength. When the vibration time is 30s, the splitting tensile strength reaches the maximum value. The vibrating time is in the range of 30 ~ 60s, the compressive strength increases gradually with the time of vibrating, and the strength increases gradually, but the splitting tensile strength decreases gradually. With the increase of vibrating time, the bulk density Gradually increased, the rubber particles floating phenomenon gradually obvious. The suitable vibrating time of rubber aggregate concrete is 30 ~ 40s.