期刊
CEMENT & CONCRETE COMPOSITES
卷 31, 期 7, 页码 438-446出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2009.04.013
关键词
Reactive aggregate powder; Pozzolan; Alkali-aggregate reaction; Expansion; Supplementary cementing materials (SCM)
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
This study assesses the potential of ground reactive aggregates to reduce or suppress expansion associated with ASR. Particular attention is paid to fine admixtures (<80 mu m) added to mortars. which contain the reactive aggregates from which the fines were ground. Many varieties of aggregate (quarried and natural, igneous, metamorphic and sedimentary rocks) from different geological settings were subjected to an autoclave test. The replacement of 10-20% of the sand by reactive aggregate powder (RAP) of different surface areas from 11 different reactive aggregates led to the reduction of ASR-expansion by up to 78% compared with control mortars. Increasing the amount of fines led to better performance. No clear relationship was observed between the reactivity degree of the aggregates and the efficiency of their ground powder to reduce expansion. A general trend was found regarding the fineness of ground aggregates: finer particles were more effective in reducing expansion. The reduction of the expansion due to RAP is discussed in terms of parameters affecting its efficiency and of the mechanisms responsible for the reduction. (C) 2009 Elsevier Ltd. All rights reserved.
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