Behaviour of lightweight expanded polystyrene concrete containing silica fume
Behaviour of lightweight expanded polystyrene concrete containing silica fume
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DOI：
10.1016/s0008-8846(02)01055-4
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发表时间：
2003-05-01
影响因子：
11.4
通讯作者：
Babu, DS
中科院分区：
文献类型：
--
作者：
Babu, KG;Babu, DS
轻质混凝土可以通过用轻质骨料部分或全部取代普通骨料来生产，这取决于密度和强度的要求。本研究涵盖了使用发泡聚苯乙烯（EPS）珠作为轻骨料在混凝土和砂浆含有硅灰作为辅助胶凝材料。本课题的主要目的是研究EPS混凝土的强度和耐久性能。这些混合物是通过使用不同百分比的硅灰的效率来设计的。所得到的混凝土的密度从1500到2000 kg/m3不等，相应的强度从10到21 MPa不等。这些混凝土的强度增加率表明，硅粉百分比的增加增加了7天强度。在3%、5%和9%的硅灰替代水平下，观察到这分别为相应28天强度的约75%、85%和95%。在30分钟和最终吸收的吸收结果表明，与含有正常骨料的混合物相比，用砂制成的EPS混合物具有较低的吸收水平。此外，吸收值被认为是随着水泥含量的增加而降低。这些混凝土的性能，在其氯化物渗透性和耐腐蚀性方面，即使在最小的硅灰含量水平下，观察到是非常好的。(C)2002年由Elsevier Science Ltd.出版
Lightweight concrete can be produced by replacing the normal aggregate with lightweight aggregate, either partially or fully, depending upon the requirements of density and strength. The present study covers the use of expanded polystyrene (EPS) beads as lightweight aggregate both in concretes and mortars containing silica fume as a supplementary cementitious material. The main aim of this project is to study the strength and the durability performance of EPS concretes. These mixes were designed by using the efficiency of silica fume at the different percentages. The resulting concretes were seen to have densities varying from 1500 to 2000 kg/m(3), with the corresponding strengths varying from 10 to 21 MPa. The rate of strength gain for these concretes shows that an increase in the percentage of silica fume increases the 7-day strength. This was observed to be about 75%, 85%, and 95% of the corresponding 28-day strength at the silica fume replacement levels of 3%, 5%, and 9%, respectively. The results of absorption, at 30 min and the final absorption, show that the EPS mixes made with sand have lower levels of absorption compared to the mixes containing normal aggregates. Further, the absorption values were seen to be decreasing with increasing cementitious content. The performance of these concretes, in terms of their chloride permeability and corrosion resistance, even at the minimal silica fume content level was observed to be very good. (C) 2002 Published by Elsevier Science Ltd.