双掺技术在尾矿砂加气混凝土中的应用  

Study on the Test Performance of Double Mixing Technology in Tailing Aerated Concrete

作　　者：张巨松[1] 苏杭 董建国 ZHANG Jusong;SU Hang;Dong Jianguo(Materials Science and Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Qin Zhen Environmental Building Materials Co.Ltd,Liaoyang,China 110000)

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168 [2]辽宁秦甄环保建材有限公司,辽宁辽阳110000

出　　处：《沈阳建筑大学学报（自然科学版）》2018年第6期1045-1053,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(50274025);辽宁省教育厅科技攻关项目(11211004)

摘　　要：目的复掺减水剂、稳泡剂改善尾矿砂加气混凝土孔结构;复掺矿渣、偏高岭土、粉煤灰提高尾矿砂加气混凝土孔间壁密实度,解决其吸水率高,抗压强度偏低,抗冻性偏差的问题.方法制备B06级尾矿砂加气混凝土试件,测试加气混凝土试块的干密度、抗压强度、质量吸水率以及抗冻性能.结果减水剂掺量为0. 14%,稳泡剂为铝粉掺量的20%时,质量吸水率下降到57%,抗压强度4. 68 MPa;复掺外加剂与各种矿物掺合料可以使抗压强度提高到5. 76 MPa,吸水率降低到50%.结论双掺技术可以有效提高加气混凝土的抗压强度,降低吸水率,同时满足寒冷地区冻融50次的要求,冻融循环后达到B06优等品(A)的冻融标准.The pore structure of autoclaved aerated concrete can be improved by compound water-reducing admixture and foam stabilizing agent.The density of autoclaved aerated concrete holes can be improved by the mixture of slag,metakaolin and fly ash,which can also solve the problems of high water absorption,low compressive strength and deviation of frost resistance.B06grade tailings sand autoclaved aerated concrete specimens were prepared to test the dry density,compressive strength,mass water absorption and frost resistance of autoclaved aerated concrete specimens.When the content of superplasticizer is0.14%,and the content of foam stabilizer is20%of aluminum powder,the water absorption rate decreases to57%,in the meantime,the compressive strength is4.68MPa.Compressive strength can be increased to5.76MPa and water absorption can be reduced to50%by mixing admixtures and mineral admixtures.So when the Double-mixing technology is adopted,the compressive strength of autoclaved aerated concrete will be improved effectively,water absorption will be reduced,the requirements of freeze-thaw50times in cold areas can be meet,and the B06quality(A)freeze-thaw standard can be also achieved after freeze-thaw cycle.

关 键 词：加气混凝土 外加剂 矿物掺合料 冻融 

分 类 号：TU522.32[建筑科学—建筑技术科学]