废旧橡胶粉改性混凝土渗透性能试验研究

Experimental Research on Permeability of Waste Scrap Rubber Powder Modified Concrete

以C30混凝土为基准,选用16目、20目、40目三种粒径废旧轮胎橡胶粉等体积取代粗细骨料制备橡胶混凝土,研究胶粉粒径、掺量对橡胶混凝土28d后的平均渗水高度、相对渗水系数的影响。结果表明,掺入橡胶粉后,混凝土拌合物流动性减弱,孔隙率减小;16目胶粉混凝土的渗水高度和相对渗透系数随胶粉掺量呈现先低再高再低的变化,20目、40目胶粉橡胶混凝土波动变化小;胶粉掺量小于125L时,三种胶粉制备的混凝土,相对渗透系数均小于基准混凝土,到125L时,相对渗透系数趋于一致;综合橡胶混凝土28d抗压强度和抗渗性能表现,橡胶粉的掺量宜控制在100L以内,最佳粒径为20目和40目。

Using C30 concrete as a standard, rubber concrete is prepared by waste scrap rubber powder with three particle size of 16 mesh, 20 mesh and 40 mesh scrapped which is replaced in same volume. The influence of powder par- ticle size and dosage on average water penetration height and relative permeability coefficients for rubber concrete after 28 days later is investigated. The results show that, the fluent of fresh concrete decreases and porosity reduces by adding rubber powder; by adding dosage of powder, water penetration height of concrete with 16 mesh powder and relative permeability coefficients decrease first then increase at last decrease, while 20 mesh and 40 mesh varies between a small range; when dosage of powder is less than 125 liter, relative permeability coefficient of rubber concrete mixed with three kinds of powder is less than reference concrete. Relative permeability coefficient of rubber concrete comes consistent up to 125 liter dosage. Compressive strength and permeability of rubber concrete in 28 day are synthesized, the content of rubber powder is controlled by 100 liter, best diameter is 20 mesh and 40 mesh.