Performances evaluation of binary concrete designed with silica fume and metakaolin
Performances evaluation of binary concrete designed with silica fume and metakaolin
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DOI：
10.1016/j.conbuildmat.2018.01.138
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发表时间：
2018-03-30
影响因子：
7.4
通讯作者：
Fitriani, Heni
中科院分区：
文献类型：
--
作者：
Meddah, Mohammed Seddik;Ismail, Mohamed A.;Fitriani, Heni
各种火山灰和胶凝材料的使用不仅具有环境和经济影响，通过减少波特兰水泥熟料的产量，还可以显著提高混凝土的强度和耐久性能。硅灰（SF）是一种众所周知的且大量使用的火山灰材料，这是由于可以为混凝土提供许多改进，而偏高岭土（MK）即使具有非常相似的性能，在混凝土工业中仍然不太受欢迎。研究了SF和MK取代波特兰水泥（PC）5%~ 25%的二元混凝土配合比的主要力学性能和耐久性能，结果表明，SF和MK部分取代PC能显著提高混合水泥混凝土的强度和耐久性能。同时，SF-混凝土似乎比MK-混凝土的强度发展和耐冻融性能更好，而MK-混凝土表现出更好的性能，碳化和氯离子的侵入。此外，虽然经济评估表明，由于SF/MK比PC更昂贵的事实，用SF/MK制成的混凝土的成本增加，但环境评估表明，当使用MK，特别是SF作为PC的部分替代品时，产生的隐含CO2（ECO 2）显著减少。设计二元SF和MK混凝土可以有助于生产清洁和环境友好的混凝土材料。(C)2018爱思唯尔有限公司版权所有。
The use of various pozzolanic and cementitious materials not only has an environmental and economic impact, by the reduction of Portland cement clinker production, but also could significantly improve the strength and durability performances of concrete. Silica fume (SF) is a well-known and largely used pozzolanic material due to numerous improvements that could provide to concrete while metakaolin (MK) even with quite similar performance is still less popular in concrete industry. The present study investigates and compares the key mechanical properties and durability performances of binary concrete mixes designed with different replacement levels of SF and MK varying from 5% to 25% of Portland cement (PC).The results indicate that using both SF and MK in a partial substitution of PC could significantly improve strengths and durability performances of blended cement concrete mixes in comparison with the control PC-concrete. Meanwhile, SF-concrete seems to perform better than MK-concrete with regards to strength development and resistance to freezing-thawing while MK-concrete has exhibited a better performance with regard to carbonation and chloride ions ingress. Furthermore, although economical assessment showed an increase in the cost of concrete made with SF/MK due to the fact that SF/MK are more expensive than PC, environmental assessment revealed that significant reduction of the embodied CO2 (ECO2) is generated when using MK, and especially SF as a partial substitution of PC. Designing a binary SF and MK concretes may help towards producing clean and environmentally friendly concrete material. (C) 2018 Elsevier Ltd. All rights reserved.