期刊
CEMENT & CONCRETE COMPOSITES
卷 30, 期 8, 页码 700-705出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2008.05.004
关键词
leaching; portlandite; X-ray powder diffraction; Rietveld method; thermal analysis
资金
- Ministry of Economic Development
- Italian Electrical System
- Prof Alessandro Gualtieri (Modena University)
Long-term leaching tests on concretes have been performed to investigate portlandite dissolution by means of X-ray powder diffraction and the Rietveld method, which reveals a promising approach to detect CH content in leached concrete. Several concrete samples have been prepared and immersed in deionised water for 0, 35, 99 and 150 days. The results have been compared with those obtained by DTA/TGA measurements. The Rietveld method provides quantitative determinations of Ca(OH)(2) in agreement with thermal analyses. Portlandite dissolution front in a concrete drifts inward upon increasing leaching duration. The distribution of portlandite as a function of the sample depth in the concretes treated for 0, 99 and 150 days show similar trends. (C) 2008 Elsevier Ltd. All rights reserved.
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