Properties of sustainable concrete containing fly ash, slag and recycled concrete aggregate
Properties of sustainable concrete containing fly ash, slag and recycled concrete aggregate
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DOI：
10.1016/j.conbuildmat.2009.02.011
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发表时间：
2009-07-01
影响因子：
7.4
通讯作者：
Berndt, M. L.
中科院分区：
文献类型：
--
作者：
Berndt, M. L.
研究了在风力涡轮机基础和其他涉及大量混凝土的应用中使用更“可持续”混凝土的适用性。所采取的方法是进行材料替代，以减少混凝土对环境、能源和CO（2）的影响。这是通过用大量粉煤灰或高炉矿渣部分取代水泥并使用再生混凝土骨料来实现的。考虑了五种基本混凝土配合比。这些是：（1）没有材料替代的常规混合物，（2）用粉煤灰替代50%的水泥，（3）用高炉矿渣替代50%的水泥，（4）用高炉矿渣替代70%的水泥，和（5）用粉煤灰替代25%的水泥和用高炉矿渣替代25%的水泥。研究了普通混凝土和矿渣改性混凝土中混凝土骨料的膨胀情况。性能研究包括压缩和拉伸强度，弹性模量，渗透系数和耐久性在氯化物和硫酸盐溶液。确定含有50%矿渣的混合物给出最佳的总体性能。矿渣对再生骨料混凝土特别有益，可以减少强度损失。耐久性试验表明，使用再生混凝土骨料时，渗透系数和氯离子扩散系数略有增加。然而，值仍然是可以接受的耐久性混凝土和氯离子扩散系数的改善，掺入矿渣的混合物。对于本研究中使用的材料和配合比，含50%粉煤灰的混凝土性能相对较差，建议在建筑项目中使用此类混合物之前进行彻底测试。(C)2009爱思唯尔有限公司保留所有权利。
The suitability of using more "sustainable" concrete for wind turbine foundations and other applications involving large quantities of concrete was investigated. The approach taken was to make material substitutions so that the environmental, energy and CO(2)-impact of concrete could be reduced. This was accomplished by partial replacement of cement with large volumes of fly ash or blast furnace slag and by using recycled concrete aggregate.Five basic concrete mixes were considered. These were: (1) conventional mix with no material substitutions, (2) 50% replacement of cement with fly ash, (3) 50% replacement of cement with blast furnace slag, (4) 70% replacement of cement with blast furnace slag and (5) 25% replacement of cement with fly ash and 25% replacement with blast furnace slag. Recycled concrete aggregate was investigated in conventional and slag-modified concretes. Properties investigated included compressive and tensile strengths, elastic modulus, coefficient of permeability and durability in chloride and sulphate solutions. It was determined that the mixes containing 50% slag gave the best overall performance. Slag was particularly beneficial for concrete with recycled aggregate and could reduce strength losses. Durability tests indicated slight increases in coefficient of permeability and chloride diffusion coefficient when using recycled concrete aggregate. However, values remained acceptable for durable concrete and the chloride diffusion coefficient was improved by incorporation of slag in the mix. Concrete with 50% fly ash had relatively poor performance for the materials and mix proportions used in this study and it is recommended that such mixes be thoroughly tested before use in construction projects. (C) 2009 Elsevier Ltd. All rights reserved.