泡沫混凝土的制备及性能研究.pdfVIP

泡沫混凝土的制备及性能研究 乔欢欢 卢忠远 严云 （西南科技大学材料科学与工程学院，先进建筑材料四川省重点实验室 四川 绵阳 621010 ） 摘要 以硅酸盐水泥和粉煤灰为主要原料，采用化学发泡剂发泡和矿物发泡剂发泡相结合的复合发泡方式，用预发泡 的方法制备免蒸养泡沫混凝土。研究了矿物发泡剂的发泡原理及掺量的确定，并研究了发泡剂掺量、减水剂、水灰 比以及粉煤灰等对泡沫混凝土性能的影响规律。研究结果表明：采用高浓萘系减水剂和磨细粉煤灰可以大幅度增加 泡沫混凝土的强度；水灰比对泡沫混凝土的影响规律不同于一般水泥混凝土；要达到一定容重的泡沫混凝土，其泡 沫掺量具有一定的范围。 关键字 泡沫混凝土 普通硅酸盐水泥 矿物发泡剂 Study on preparation and property of foamed concrete QIAO Huanhuan, LU Zhongyuan , YAN Yun (School of Material Science and Engineering , Southwest University of Science and Technology, key laboratory for advanced building materials of Sichuan province, Mianyang 621010, China) Abstract Portland cement and fly ash were used as chief raw materials, and a new foam technology which combines the traditional surfactant and mineral addictives was adopted to prepare foamed concrete. The foaming principle and content of mineral addictives were learned, influence of the content of surfactant, water reducing agent, water-solids ratio and fly ash on the properties of foamed concrete were studied at the same time. It showed that the strength of foamed concrete increased when using the grinded fly ash and the water reducing agent including smaller Na SO . The rule of 2 4 influence of water-solids ratio on the foamed concrete was different from others. When a designed bulk density was got, the content of surfactant has a optimum range. Keywords foamed concrete Portland cement mineral addictives 0 前言 随着我国墙体材料改革与建筑节能政策的推行，节能型建筑材料的开发和应用受到广泛的重视， 国内大力发展节能、利废、保温、轻质、隔热等新型材料[1,2],其中，泡沫混凝土砌块在非承重墙体 材料中，占有重要的地位。泡沫混凝土通常是用机械或压缩空气的方法将泡沫剂的水溶液制备成泡 沫，再将泡沫加入到含硅质材料、钙质材料、水及各种外加剂等组成的料浆中，经混合搅拌、浇注 成型、养护而成的一种内部含有大量封闭气孔的混凝土[3,4] 。这种混凝土由于多孔轻质，使其具有较 [5-7] 低的热膨胀系数、较好的隔热、隔音以及耐火性能