Analysis of moisture migration in concrete at high temperature through in-situ neutron tomography

被引：66

作者：

Dauti, Dorjan ^{[1
,2
]}

Tengattini, Alessandro ^{[1
,3
]}

Dal Pont, Stefano ^{[1
]}

Toropovs, Nikolajs ^{[2
,4
]}

Briffaut, Matthieu ^{[1
]}

Weber, Benedikt ^{[2
]}

机构：

[1] Univ Grenoble Alpes, CNRS, Grenoble INP, 3SR, F-38000 Grenoble, France

[2] Empa, Swiss Fed Labs Mat Sci & Technol, Uberlandstr 129, CH-8600 Dubendorf, Switzerland

[3] Inst Laue Langevin, 71 Ave Martyrs, F-38000 Grenoble, France

[4] Riga Tech Univ, Inst Mat & Struct, 1 Kalku St, LV-1658 Riga, Latvia

来源：

CEMENT AND CONCRETE RESEARCH | 2018年 / 111卷

关键词：

Neutron tomography; Drying front [A; Aggregate size [D; Image analysis [B; Moisture clog; HIGH-PERFORMANCE CONCRETE; POLYPROPYLENE FIBERS; FIRE; BEHAVIOR; RADIOGRAPHY; PRESSURE; DAMAGE;

D O I：

10.1016/j.cemconres.2018.06.010

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Spalling, which is a phenomenon encountered when high-performance concrete is exposed to high temperature, can lead to large economical damage and can be a major safety hazard. Moisture distribution in concrete during exposure to fire is of paramount importance for understanding the complex mechanism of this phenomenon. To capture in its fullness this mechanism, it is crucial to account for the heterogeneous nature of concrete. In this paper, the first 3D analysis of moisture distribution in concrete at high temperature through in-situ neutron tomography is presented. The world-leading flux at the Institute Laue Langevin in Grenoble, France allowed capturing one 3D scan per minute, which is sufficient to follow the fast dehydration process. The paper describes the experimental setup with the heating system and discusses in detail the framework of the neutron tomography test. Quantitative analysis showing the effect of the aggregate size on the moisture distribution is presented.

引用

页码：41 / 55

页数：15

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