论文部分内容阅读
以H_2O_2溶液(质量浓度30%)为发泡剂,粗、细膨胀珍珠岩颗粒为轻集料和发泡剂载体,明胶为稳泡剂,采用将加载发泡剂的载体拌入轻集料混凝土的水泥浆中原位化学发泡的方法,制备出了系列轻混凝土试样,并对其性能进行了系统表征。结果表明,原位发泡轻混凝土中外加1.5%(质量分数)胶凝材料量的稳泡剂后,对气泡有较为理想的稳泡作用,可获得均匀分布的细小气泡(气泡直径0.5~1mm)。原位发泡轻混凝土的体积密度随发泡剂量增加而降低,随稳泡剂量的增加而增大。当稳泡剂为胶凝材料量的1.5%(质量分数)时,原位发泡轻混凝土试样的抗压强度和导热系数均随着发泡剂量的增加而降低。其中,发泡剂量为胶凝材料量1.4%(质量分数)试样的28d抗压强度为21 MPa,体积密度为940kg/m3,比不发泡试样的强质比提高了14%,导热系数降低了13%。
With H 2 O 2 solution (mass concentration 30%) as blowing agent, the coarse and fine expanded perlite particles are light aggregate and foaming agent carrier, gelatin is foam stabilizer, and the carrier with foaming agent is mixed into light aggregate A series of light concrete specimens were prepared by in-situ chemical foaming in concrete grout. The properties of the samples were systematically characterized. The results show that foam stabilizing agent with 1.5% (mass fraction) cementitious material added to in-situ foamed lightweight concrete has an ideal foam stabilizing effect on bubbles and uniform distribution of fine bubbles (bubble diameter 0.5 ~ 1mm ). The bulk density of in-situ foamed lightweight concrete decreases with the increase of foaming agent and increases with the increase of foaming agent. When the foam stabilizer is 1.5% (mass fraction) of the cementitious material, the compressive strength and thermal conductivity of in-situ foamed lightweight concrete specimens decrease with the increase of foaming agent. The compressive strength at 28d was 21 MPa and the bulk density was 940kg / m3, which was 14% higher than that of the unfoamed specimen. The thermal conductivity The coefficient is reduced by 13%.