Proportioning and characterization of Portland cement-based ultra-lightweight foam concretes
Proportioning and characterization of Portland cement-based ultra-lightweight foam concretes
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波特兰水泥基超轻泡沫混凝土的配比和表征
DOI：
10.1016/j.conbuildmat.2015.01.051
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发表时间：
2015-03-15
影响因子：
7.4
通讯作者：
Wen, Ziyun
中科院分区：
文献类型：
--
作者：
Huang, Zhaoming;Zhang, Tongsheng;Wen, Ziyun
超轻质泡沫混凝土具有良好的保温隔热性能、上级耐火性能和较高的耐久性，被推荐用于建筑节能。通常，铝酸盐水泥、硫铝酸盐水泥和其它快硬胶凝材料用于控制泡沫混凝土中的空隙稳定性。这些特殊的胶凝材料相对昂贵且不能普遍获得，阻碍了泡沫混凝土的应用和推广。研究了波特兰水泥基超轻泡沫混凝土的配合比和性能。结果表明，采用波特兰水泥、粉煤灰、过氧化氢和化学外加剂，可以制备出表观密度为100-300 kg/m3的超轻泡沫混凝土。在泡沫混凝土中加入增稠剂和稳泡乳液，可以防止泡沫混凝土的坍塌和气泡逸出。超轻质泡沫混凝土中的孔隙大多为2.0- 4.0mm的非连通孔隙，具有较低的导热系数和较好的抗压、抗拉强度。(C)2015爱思唯尔有限公司版权所有。
Due to desirable thermal insulation properties, superior fire-resistant and higher durability, ultra-light-weight foam concretes are recommended to achieve energy efficiency in buildings. Generally, aluminate cement, sulphoaluminate cement and other quick hardening cementitious materials are used to control the stability of air-voids in foam concretes. These special cementitious materials are relatively expensive and not universally available, retarding the application and popularization of foam concretes. In the present study, the proportioning and properties of Portland cement-based ultra-lightweight foam concrete were investigated. The results show that ultra-lightweight foam concretes with apparent density of 100-300 kg/m(3) can be prepared using Portland cement, fly ash, hydrogen peroxide and chemical admixtures. Collapse and air-voids escape can be avoided by adding thickening agent and foam stabilizing emulsion into foam concretes. Most of pores in ultra-lightweight foam concretes were non-connected pores with size of 2.0-4.0 mm, resulting in a lower thermal conductivity, desirable compressive and tensile strengths. (C) 2015 Elsevier Ltd. All rights reserved.