Compressive strength, chloride diffusivity and pore structure of high performance metakaolin and silica fume concrete
Compressive strength, chloride diffusivity and pore structure of high performance metakaolin and silica fume concrete
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DOI：
10.1016/j.conbuildmat.2005.07.001
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发表时间：
2006-12-01
影响因子：
7.4
通讯作者：
Lam, L.
中科院分区：
文献类型：
--
作者：
Poon, C. S.;Kou, S. C.;Lam, L.
本研究旨在探讨高性能偏高岭土（MK）与矽灰混凝土之力学与耐久性能与其微结构特性之关系。测定了对照混凝土和掺入MK或硅灰（SF）的混凝土在水-粘合剂（w/B）比为0.3和0.5时的抗压强度和氯离子渗透性。并测定了混凝土的孔径分布和孔隙率。根据试验结果讨论了MK和SF对界面孔隙率的影响。结果表明，MK混凝土具有上级强度发展和与SF混凝土相似的抗氯离子侵蚀性能，w/B为0.3的MK混凝土具有较低的孔隙率和较小的孔径。混凝土的抗氯离子渗透性与测得的混凝土孔隙率比与膏体孔隙率相关性更好。MK和SF掺入混凝土的实测和计算的混凝土孔隙率之间的差异小于对照混凝土，表明掺入火山灰后界面微观结构得到改善。这种差异在一定程度上与混凝土的强度和氯离子渗透性有关。(c)2005爱思唯尔有限公司保留所有权利。
This study is to relate the mechanical and durability properties of high performance metakaolin (MK) and silica fume concretes to their microstructure characteristics. The compressive strength and chloride penetrability of the control and the concretes incorporated with MK or silica fume (SF) at water-to-binder (w/b) ratios of 0.3 and 0.5 are determined. The pore size distribution and porosity of the concretes are also measured. The effect of MK and SF on the interfacial porosity is discussed based on test results. It is found that MK concrete has superior strength development and similar chloride resistance to SF concrete, and the MK concrete at a w/b of 0.3 has a lower porosity and smaller pore sizes than the control (plain) concrete. The resistance of the concretes to chloride ion penetration correlates better with the measured concrete porosity than with the paste porosity. The differences between the measured and calculated concrete porosity is smaller for MK and SF incorporated concrete than for the control concrete, indicating an improvement in the interfacial microstructure with the incorporation of the pozzolanas. This difference is found to be related to the strength and chloride penetrability of concrete to some degree. (c) 2005 Elsevier Ltd. All rights reserved.