Engineering and durability properties of concretes based on alkali-activated granulated blast furnace slag/metakaolin blends

被引:316
作者
Bernal, Susan A. [1 ,2 ]
Mejia de Gutierrez, Ruby [2 ]
Provis, John L. [1 ]
机构
[1] Univ Melbourne, Dept Chem & Biomol Engn, Melbourne, Vic 3010, Australia
[2] Univ Valle, Sch Mat Engn, Composite Mat Grp, CENM, Cali, Colombia
基金
澳大利亚研究理事会;
关键词
Alkali-activated concretes; Slag/metakaolin blends; Mechanical strength; Chloride permeability; Carbonation; CALCIUM SILICATE HYDRATE; C-S-H; STRENGTH DEVELOPMENT; CHLORIDE DIFFUSION; PERMEABILITY TEST; SLAG CEMENT; FLY-ASH; METAKAOLIN; CARBONATION; HYDROXIDE;
D O I
10.1016/j.conbuildmat.2012.01.017
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The effects of activation conditions on the engineering properties of alkali-activated slag/metakaolin blends are examined. At high activator concentration, compressive strengths at early age are enhanced by the inclusion of metakaolin in the binder. A similar effect is observed in the flexural strength of the concretes, as dissolution and reaction of metakaolin is favoured under higher-alkalinity activation conditions. Increased metakaolin contents and higher activator concentrations also lead in most cases to reduced water sorptivity and lower chloride permeability. The correlation between the outcome of the rapid chloride permeability test (RCPT) and a directly-measured chloride diffusion coefficient is weak, revealing the limitations of the RCPT when applied to alkali-activated concretes. Accelerated carbonation, induced by exposure to elevated CO2 concentrations, leads to a reduction in compressive strength and an increased permeability; however, there is not a linear relationship between carbonation depth and total porosity, indicating that CO2 diffusion is not the only parameter controlling the carbonation of these materials. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:99 / 108
页数:10
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