Impact of carbonation on unsaturated water transport properties of cement-based materials

被引：128
作者：
Auroy, Martin [1 ]
Poyet, Stephane [1 ]
Le Bescop, Patrick [1 ]
Torrenti, Jean-Michel [2 ]
Charpentier, Thibault [3 ]
Moskura, Melanie [3 ]
Bourbon, Xavier [4 ]
机构：
[1] CEA, Lab Etud Comportement Betons & Argiles, SECR, DEN,DPC, F-91191 Gif Sur Yvette, France
[2] Univ Paris Est, IFSTTAR, Dept Mat & Struct, F-77447 Marne La Vallee 2, France
[3] CEA, Lab Struct & Dynam Resonance Magnet, CNRS, DSM,IRAMIS,NIMBE,UMR 3299, F-91191 Gif Sur Yvette, France
[4] Andra, F-92298 Chatenay Malabry, France
来源：
CEMENT AND CONCRETE RESEARCH | 2015年 / 74卷
关键词：
Waste management; Cement paste; Drying; Permeability; Microstructure; C-S-H; HYDRAULIC CONDUCTIVITY; ACCELERATED CARBONATION; SOIL PROPERTIES; LOW-ALKALINITY; SALT-SOLUTIONS; SURFACE-AREA; LOW-HEAT; PERMEABILITY; CONCRETE;
D O I：
10.1016/j.cemconres.2015.04.002
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In unsaturated conditions, the durability of concrete structures is strongly dependent on the evolution of the amount of free water within concrete porosity. Reliable durability assessment of concrete structures in relation to their environment thus requires accurate unsaturated water transport description as well as reliable input data. The effect of carbonation on water transport remains poorly studied and data are lacking. It was then the purpose of this article to acquire all the data needed to describe unsaturated water transport in carbonated cementitious materials (porosity, water retention and unsaturated permeability). Four hardened pastes made with four different binders were carbonated at 3% CO2 to ensure representativeness with natural carbonation. Beyond the modification of the water retention curve and porosity clogging, significant microcracking due to carbonation shrinkage was observed. The consequence on permeability highlighted a competition between porosity clogging and microcracking that was dependent on the initial mineralogical composition. (C) 2015 Elsevier Ltd. All rights reserved.
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收藏
页码：44 / 58
页数：15
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