H_2O_2原位发泡轻混凝土的制备与性能表征  

Preparation and characterization of the lightweight concrete produced by H_2O_2 chemical foaming in situ

作　　者：樊传刚[1] 吴瑞[1] 黄兴田 陈贺 孟方方[1] 李家茂[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]马鞍山市墙体材料改革办公室,安徽马鞍山243000 [3]马鞍山17冶工程科技有限公司,安徽马鞍山243000

出　　处：《功能材料》2016年第5期129-132,共4页Journal of Functional Materials

基　　金：安徽省科技攻关资助项目(1301042105)

摘　　要：以H2O2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%。The lightweight concrete （LC） specimens were prepared using the method of chemical foaming in situ.In the foaming process, the H2O2 was used as foaming agent, the coarser and fine expanded perlites were usedas lightweight aggregate and as carrier for H2O2 respectively, and the gelatin was used as foam stabilizer. Thefoaming reaction of He O2 was taken place after it was being charged into carriers and the charged carriers weremixed into the mortar previously. The mortar was enclosed by the lightweight aggregates in fresh concrete. Theproperties of the resulting LC specimens were characterized systemically. It was found that the adding amountof 1.5wt% foam stabilizer had the promising stabilization for the foam formed in situ, which resulted in thebubbles with 0.5-1 mm diameter in homogeneous distribution. The bulk densities （BD） of resulting LC speci-mens were decreased with the increasing of the adding amount of foaming agent, and increased with the addingamount of foam stabilizer. For the resulting LC specimens with foam stabilizer amount of 1.5wt% , their 28 dcompressive strengths （CS） and thermal conducting coefficients （TCC） were decreased with the increase of theamount of foaming agent. Among them, the resulting LC specimen with foaming agent of 1.4wt% had the 28 dCS of 21 MPa and the BD of 940 kg/m3. As compared with that of the resulting LC specimen without foamingagent, its specific strength value was improved by 14% and its TCC was decreased by 13%, respectively.

关 键 词：轻混凝土 原位化学发泡 发泡剂载体 

分 类 号：TU528.2[建筑科学—建筑技术科学]