The spalling mechanism of high-strength concrete under fire

被引：46

作者：

Ko, Jeongwon ^{[1
]}

Noguchi, Takafumi ^{[2
]}

Ryu, Dongwoo ^{[3
]}

机构：

[1] DICT, Suwon S, South Korea

[2] Univ Tokyo, Dept Architecture, Tokyo, Japan

[3] Daejin Univ, Dept Architectural Engn, Pocheon Si, South Korea

来源：

MAGAZINE OF CONCRETE RESEARCH | 2011年 / 63卷 / 05期

关键词：

PORE PRESSURE; HIGH-TEMPERATURES; HEATED CONCRETE; MOISTURE; PREDICTION;

D O I：

10.1680/macr.10.00002

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The spalling properties of concrete were investigated in relation to surface moisture content. Changes in the microstructure of concrete, moisture transfer and internal pressure were also investigated from a microscopic aspect. Based on the results of the investigation, experimental research was conducted on the effects of heat and moisture transfer on spalling as well as the causes of vapour pressure (internal stress) surges and spalling. Spalling of high-strength concrete was found to be significantly affected by moisture transfer in the surface region of concrete and moisture transfer was found to be closely related to the temperature profiles resulting from the characteristics of pore structures, which are the main passages for moisture. It was also found that, in the high-strength (80 MPa) concrete used in this study, the probability of spalling and scale of damage could be reduced according to dryness in the surface region (0-30 mm depth).

引用

页码：357 / 370

页数：14

共 29 条

[1] Modeling pore pressure, moisture, and temperature in high-strength concrete columns exposed to fire [J].

Ahmed, GN ;

Hurst, JP .

FIRE TECHNOLOGY, 1999, 35 (03) :232-262

[2]

Anderberg Y., 1976, Stress and deformation characteristics of concrete at high temperatures, 2-Experimental investigation and material behaviour model

[3]

Anderberg Y., 1997, P INT WORKSHOP FIRE, P69

[4]

[Anonymous], C192 ASTM

[5]

[Anonymous], ACI MAT J

[6]

[Anonymous], 1994, EUR 4 DES COMP STEEL

[7]

ASCHL M, 1977, MECH EIGENSCHAFTEN M

[8]

BAZANT ZP, 1979, MAG CONCRETE RES, V31, P67

[9]

BAZANT ZP, 1978, J ENG MECH DIV-ASCE, V104, P1059

[10] FINITE-ELEMENT PROGRAM FOR MOISTURE AND HEAT-TRANSFER IN HEATED CONCRETE [J].

BAZANT, ZP ;

CHERN, JC ;

THONGUTHAI, W .

NUCLEAR ENGINEERING AND DESIGN, 1982, 68 (01) :61-70

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