Ternary blending with metakaolin and silica fume to improve packing density and performance of binder paste

被引：60
作者：
Chen, J. J. [1 ]
Ng, P. L. [2 ,3 ]
Chu, S. H. [3 ]
Guan, G. X. [4 ]
Kwan, A. K. H. [3 ]
机构：
[1] Foshan Univ, Dept Civil Engn, Foshan, Peoples R China
[2] Vilnius Gediminas Tech Univ, Fac Civil Engn, Vilnius, Lithuania
[3] Univ Hong Kong, Dept Civil Engn, Hong Kong, Peoples R China
[4] G&K Consultancy Ltd, Hong Kong, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 252卷
关键词：
Metakaolin; Packing density; Permeable porosity; Silica fume; Water film thickness; Water sorptivity; CEMENTITIOUS MATERIALS; COMPRESSIVE STRENGTH; RHEOLOGICAL PROPERTIES; WORKABILITY; MORTAR; FILLER; ASH; SUPERPLASTICIZERS; MICROSTRUCTURE; REPLACEMENT;
D O I：
10.1016/j.conbuildmat.2020.119031
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In theory, ternary blending of cement with metakaolin (MK), which is of finer size, and silica fume (SF), which is even finer, would improve the packing density (PD) by successively filling the voids between cement grains. This should release more excess water (water in excess of that filled into voids) for fresh properties improvement and densify the microstructure for hardened properties improvement. To verify this postulation and reveal how and why (cement + MK + SF) ternary blending improves the fresh and hardened properties, 21 binder pastes with various MK and SF contents and a constant water/binder ratio were produced for flowability, adhesiveness, strength, sorptivity and porosity testing and microstructure observation, and the corresponding binder mixes were produced for PD measurement. The results showed that such ternary blending could improve the PD and both the fresh and hardened properties. In-depth analysis proved that the additions of MK and/or SF exerted influence through the eventual changes in PD and water film thickness (WFT). Lastly, plots depicting the concurrent flowability-strength and flowability-durability performances are produced to help find the optimum MK and SF contents for best overall performance. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：13
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