废旧橡胶粉改性碾压混凝土强度试验研究

摘要

试验选用40目、80目、120目三种废旧轮胎橡胶粉按5%、10%、15%、20%以体积代砂掺入到基准碾压混凝土中，测定了橡胶混凝土密度、含气量、不同龄期的立方体抗压强度和28d轴心抗压强度。结果表明，掺入橡胶粉后，混凝土密度随掺入量增加而减小；含气量随橡胶粉掺量增加而增加；基准混凝土强度会降低，且随着橡胶粉掺入量的增加，强度降低明显；在相同橡胶粉掺量下，80目橡胶混凝土强度最大，120目橡胶混凝土强度次之，40目橡胶混凝土强度最低。%Three kinds of scrap tire rubber powder:40 mesh, 80 mesh and 120 mesh are chosen with 5%, 10%, 15%, 20% (volume ratio) replaced of sand into the benchmark roller compacted rubcrete. The density, air content, different age of cube compressive strength and 28d axial compressive strength of the rubber concrete are tested. The results show that after incorporating with rubber powder, the density of concrete decreases and air content increases with the increase of rubber powder's quantity, and the benchmark concrete strength decreases and decreases more with the more rubber pow-der. Under the same dosage of rubber powder, the 80 mesh rubber concrete has the largest strength, the 120 mesh rubber concrete next to it, and the 40 mesh rubber concrete has the lowest strength.