About microcracking due to leaching in cementitious composites: X-ray microtomography description and numerical approach

被引：73

作者：

Rougelot, Thomas ^{[1
]}

Burlion, Nicolas ^{[1
]}

Bernard, Dominique ^{[2
]}

Skoczylas, Frederic ^{[3
]}

机构：

[1] Univ Lille 1, Polytech Lille, Lab Mecan Lille, CNRS,UMR 8107, F-59650 Villeneuve Dascq, France

[2] Univ Bordeaux 1, CNRS, ICMCB, CNRS,UPR 9048, F-33608 Pessac, France

[3] Ecole Cent Lille, CNRS, UMR 8107, Lab Mecan Lille, F-59650 Villeneuve Dascq, France

来源：

CEMENT AND CONCRETE RESEARCH | 2010年 / 40卷 / 02期

关键词：

Cementitious composites; Endogenous and decalcification shrinkages; Leaching; Microcracking; X-ray computed microtomography; CHEMOMECHANICAL COUPLING BEHAVIOR; ELASTIC PROPERTIES; CALCIUM HYDROXIDE; TRANSITION ZONE; PORE STRUCTURE; CONCRETE; SHRINKAGE; PASTE; MICROSTRUCTURE; FRACTURE;

D O I：

10.1016/j.cemconres.2009.09.021

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Chemical shock of cement based materials leads to significant degradation of their physical properties. A typical scenario is a calcium leaching due to water (water with very low pH compared with that of pore fluid). The main objective of this paper is to evaluate the evolution of microstructure induced by leaching of a cementitious composite using synchrotron X-ray micro tomography, mainly from an experimental point of view. In this particular case, it was possible to identify cracking induced by leaching. After a description of the degradation mechanism and the X-ray synchrotron microtomographic analysis, numerical simulations are performed in order to show that cracking is induced by an initial pre-stressing of the composite, coupled with decalcification shrinkage and dramatic decrease in tensile strength during leaching. X-ray microtomography analysis allowed to make evidence of an induced microcracking in cementitious material submitted to leaching. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：271 / 283

页数：13

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