Durability performance and engineering properties of shale and volcanic ashes concretes
Durability performance and engineering properties of shale and volcanic ashes concretes
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DOI：
10.1016/j.conbuildmat.2015.01.020
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发表时间：
2015-03-15
影响因子：
7.4
通讯作者：
Meddah, Mohammed Seddik
中科院分区：
文献类型：
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作者：
Meddah, Mohammed Seddik
设计一种可持续的混凝土已经成为当今混凝土的重要要求。在混凝土中引入各种胶结剂和火山灰材料来替代波特兰水泥似乎是降低混凝土工业对环境影响的合适途径。本文报道了用从火山灰中提取的天然火山灰（NP）和页岩灰（SA）两种不同比例的火山灰（NP）作为波特兰水泥（PC）的部分替代品生产混凝土性能的结果。混凝土混合料的水胶比（w/c）范围从0.79到0.45不等。研究了二元拌合水泥混凝土的主要力学性能和耐久性。同时使用NP和SA会导致强度损失；而SA在强度发展和耐久性方面似乎比NP表现更好。结果表明，掺入10-15%火山灰石的水泥混凝土具有良好的抗碳化性能和抗氯离子侵入性，具有抗冻融耐久性。但当更换率高于20%时，耐久系数、氯离子和抗碳化性能下降。总体而言，研究结果表明，NP和SA二元混合水泥的力学和耐久性性能与其化学成分、细度、粒径分布和潜在反应性等固有特性密切相关。(c) 2015 Elsevier Ltd.版权所有。
Designing a sustainable concrete has become a vital requirement for today's concrete. Introducing various cementing and pozzolanic materials in concrete in replacement of Portland cement seems to be the appropriate way to lower the environmental impact of concrete industry.This paper reports results on concrete performance produced with two types of pozzolanas including natural pozzolana (NP) obtained from volcanic ash and shale ash (SA) used, in various proportions ranged from 10-45%, as a partial substitute of Portland cement (PC). Concrete mixtures were designed with a wide range of water-to-cementitious ratios (w/c) ranged from 0.79 to 0.45. The key mechanical properties and durability performance of binary blended cement concretes were investigated.Using both NP and SA has resulted in a strength loss; while SA seems to perform better than NP in terms of strength development and durability performance. The blended cement concretes with 10-15% pozzolanas was found to have a good resistance to carbonation and chloride ions ingress and are freeze-thaw durable. However, with replacement level higher than 20%, the durability factor, chloride ions and carbonation resistance drop down.Overall, the results indicate that the mechanical and durability performances of binary blended cements with NP and SA are strongly linked to their intrinsic characteristics including chemical composition, fineness, particle size distribution and potential reactivity. (c) 2015 Elsevier Ltd. All rights reserved.