【摘要】 以C90～C100高强混凝土为基础,外掺40目(420%m)、60目(250&m)和80目(178’m)三个不同粒径的精细橡胶粉,外掺量分别为胶结材料用量的1%、2%、3%、4%,研究了废旧橡胶粉对高强混凝土材料的工作性、表观密度及抗压强度的影响。对研配成功的试件进行了高温试验,利用外表面观察法、重量损失法和残余强度等方法,对比研究了高强混凝土与橡胶粉改性高强混凝土高温作用后的性能变化。研究发现:常温下高强混凝土抗压强度随着橡胶粉掺量的增加而下降,当橡胶粉外掺量小于10.8kg/m3时,其抗压强度损失低于10%;高温时低用量的40目橡胶粉能抑制高强混凝土的爆裂行为;高温作用后橡胶粉混凝土的强度有一定的增长。更多还原

【Abstract】 The influence of waste rubber powder on workability,apparent density and compressive strength of high strength concrete material was studied in the paper.Based on high strength concrete from C90~C100,The concrete was modified by different grain diameter of fine rubber powder.The grain diameter are 420μm,250μm and 178μm and the content is 1%,2%,3% and 4% of content of cementitious material.The property change of crumb rubber modified high strength concrete and high strength concrete after high temperature was studied by contrast using the method of external surface inspection,weight loss and residual strength.The results show that the compressive strength of high strength concrete decreased with the increase of rubber powder content under normal temperature.The loss of compressive strength is lower than 10% when the content of rubber powder is lower than 10.8kg/m3.Low content of rubber powder whose grain diameter is 420μm can prevent bursting behavior of high strength concrete under high temperature.The strength of rubber powder modified high strength concrete increased after high temperature.更多还原