Internal sulfate attack in mortars containing contaminated fine recycled concrete aggregates

被引：31
作者：
Colman, C. [1 ,3 ]
Bulteel, D. [1 ]
Thiery, V [1 ]
Remond, S. [2 ]
Michel, F. [3 ]
Courard, L. [3 ]
机构：
[1] Univ Lille, IMT Lille Douai, ULR 4515, LGCgE Lab Genie Civil & Geoenvironm, F-59000 Lille, France
[2] Univ Orleans, Univ Tours, INSA CVL, LaMe,EA 7494, Orleans, France
[3] Univ Liege, Urban & Environm Engn, GeMMe Bldg Mat, B-4000 Liege, Belgium
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 272卷
关键词：
Recycled aggregates; Sulfate attack; Microstructure; Waste management; Secondary ettringite formation; DELAYED ETTRINGITE FORMATION; EXPANSION; GYPSUM;
D O I：
10.1016/j.conbuildmat.2020.121851
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Internal sulfate attack can be caused by the gypsum residues present in fine recycled aggregates (FRA). As opposed to the better known external sulfate attack or Delayed Ettringite Formation (DEF), the sulfates in this context are provided by a gypsum contamination of the aggregates. Mortars made with contaminated FRA were subjected to different conditions, to assess which parameters had an influence on the sulfate attack reaction. Their mechanical properties and microstructure are investigated. Results showed that gypsum content, porosity, temperature and alkalinity influenced the consequences of sulfate attack. However, the gypsum size distribution and cement type did not. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：8
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