Application of micro X-ray diffraction to investigate the reaction products formed by the alkali-silica reaction in concrete structures

被引：55

作者：

Daehn, R. ^{[1
]}

Arakcheeva, A. ^{[2
]}

Schaub, Ph. ^{[1
]}

Pattison, P. ^{[3
,4
]}

Chapuis, G. ^{[2
,4
]}

Grolimund, D. ^{[5
]}

Wieland, E. ^{[1
]}

Leemann, A. ^{[6
]}

机构：

[1] Paul Scherrer Inst, Lab Waste Management, CH-5232 Villigen, Switzerland

[2] Phase Solut Ltd, CH-1012 Lausanne, Switzerland

[3] European Synchrotron Radiat Facil, Swiss Norwegian Beam Lines, F-38043 Grenoble 9, France

[4] Ecole Polytech Fed Lausanne, Crystallog Lab, CH-1015 Lausanne, Switzerland

[5] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[6] Empa Swiss Fed Labs Mat Sci & Technol, Lab Concrete & Construct Chem, CH-8600 Dubendorf, Switzerland

来源：

CEMENT AND CONCRETE RESEARCH | 2016年 / 79卷

关键词：

X-Ray Diffraction (B); Alkali-Aggregate Reaction (C); Crack Detection (C); Concrete (E); Microcracking (B); CRYSTAL-STRUCTURE; GEL;

D O I：

10.1016/j.cemconres.2015.07.012

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Alkali-silica reaction (ASR) is one of the most important deterioration mechanisms in concrete leading to substantial damages of structures worldwide. Synchrotron-based micro-X-ray diffraction (micro-XRD) was employed to characterize the mineral phases formed in micro-cracks of concrete aggregates as a consequence of ASR. This high spatial resolution technique enables to directly gain structural information on ASR products formed in a 40-year old motorway bridge damaged due to ASR. Micro-X-ray-fluorescence was applied on thin sections to locate the reaction products formed in veins within concrete aggregates. Micro-XRD pattern were collected at selected points of interest along a vein by rotating the sample. Rietveld refinement determined the structure of the ASR product consisting of a new layered framework similar to mountainite and rhodesite. It is conceivable that understanding the structure of the ASR product may help developing new technical treatments inhibiting ASR. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：49 / 56

页数：8

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