Moisture distribution in drying ordinary and high performance concrete cured in a simulated hot dry climate

2005 ◽  
Vol 38 (10) ◽  
pp. 920-920
Author(s):  
P. F. de J. Cano-Barrita
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Moisture Distribution

Comportement thermohydrique d’une paroi en béton : influence du type de béton, influence du type de chargement

2007 ◽  
Vol 34 (10) ◽  
pp. 1364-1370
Author(s):  
M Shekarchi ◽  
G Debicki
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Phase Transfer ◽  
Moisture Distribution ◽  
Transfer Model ◽  
Concrete Wall ◽  
Two Phase ◽  
Ordinary Concrete ◽  
Hygrothermal Behavior ◽  
Hygrothermal Behaviour

Tests simulating “the accidental conditions” and the “test of heating,” without the contribution of humidity, have been carried out on test equipment that we designed and fabricated in the scope of this work. The tests have been carried out on laterally sealed and insulated cylindrical specimens of ordinary or high-performance concrete having a thickness of 1.3 m. Experimental results present temperature, pressure, and moisture distribution throughout the specimens and permit to characterize the hygrothermal behaviour of a concrete wall. The different aspects of the phenomena affecting a two-phase transfer (steam, water) in a porous medium are presented. Test results show that high-performance concrete exposed to an increase in temperature presents a particular hygrothermal behaviour, because of its microstructure, that is put into evidence, notably while looking at the role of the silica fume. The migration of water is not as rapid in high-performance concrete as in ordinary concrete, which is favourable for tightness. Numerical investigation consists of adapting a heat and mass transfer model, initially built for ordinary concrete, to the high-performance concrete used in this work.Key words: hygrothermal behavior, concrete wall, ordinary concrete, high-performance concrete, leak tightness, temperature distribution, pressure distribution, moisture distribution.

Modeling of Moisture Distribution Evolution in High-Performance Concrete under Fire Exposure

2014 ◽  
Vol 629-630 ◽  
pp. 279-283
Author(s):  
Jie Zhao ◽  
Gai Fei Peng
Keyword(s):  
Vapor Pressure ◽  
High Performance ◽  
High Performance Concrete ◽  
Water Saturation ◽  
Initial Moisture Content ◽  
Moisture Distribution ◽  
Distribution Analysis ◽  
Vapor Pressure Gradient ◽  
Fire Conditions

High-performance concrete (HPC) will undergo severe damage under fire conditions. It is well known that vapor pressure induced by high temperatures plays an important role in the damaging process. Therefore, the determination of the moisture distribution evolution in concrete is essential to the damage analysis of heated HPC. This paper presents a numerical method for the prediction of the moisture distribution evolution in HPC under fire conditions. In the method, the vapor pressure and the moisture transport induced by the vapor pressure gradient are analyzed. The effect of the thermal decomposition on the moisture distribution and the effects of the slippage flow and the water saturation degree on the permeability are considered. The proposed method is applied to the moisture distribution analysis of a concrete cube with 90% initial moisture content under fire conditions and can be further used for the analysis of the thermal damage of heated HPC.

Moisture distribution in drying ordinary and high performance concrete cured in a simulated hot dry climate

2004 ◽  
Vol 37 (8) ◽  
pp. 522-531 ◽  
Author(s):  
P. F. de J. Cano-Barrita ◽  
B. J. Balcom ◽  
T. W. Bremner ◽  
M. B. MacMillan ◽  
W. S. Langley
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Moisture Distribution

On-Going High Performance Concrete Research in Louisiana

PCI Journal ◽  
2001 ◽  
Vol 46 (1) ◽  
pp. 79-81
Author(s):  
John J. Roller ◽  
Robert N. Bruce ◽  
Henry G. Russell
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Research
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