|Table of Contents|

Influence of Surface Cracks on Humidity Response of Concrete Under Constant Climatic Environment(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年03期
Page:
99-106
Research Field:
Publishing date:

Info

Title:
Influence of Surface Cracks on Humidity Response of Concrete Under Constant Climatic Environment
Author(s):
JIANG Jian-hua;  QIU Jia-qi;  FU Yong-quan;  LIN Ming-yi;  HU Fei-fei
(College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, Jiangsu, China)
Keywords:
concrete;  humidity response;  water-cement ratio;  fly ash;  crack width;  crack depth
PACS:
TU528
DOI:
10.19815/j.jace.2020.09027
Abstract:
In order to study the humidity response relationship between the internal micro-environment and the external environment of cracked concrete, the internal humidity response tests of concrete under different crack conditions were carried out by artificially simulating the constant climatic environment, and the effects of different water cement ratios and fly ash contents were also considered. Finally, a formula for calculating the equivalent moisture diffusion coefficient of concrete considering the effect of surface crack was proposed, and the prediction model of internal humidity response of concrete with surface crack under the constant climatic environment was established, then the feasibility of the model was verified. The results show that the internal humidity response rate of cracked concrete is higher than that of non-cracked concrete. Under the crack conditions, the humidity response rate of concrete does not change significantly with the increase of crack width, but increases linearly with the increase of crack depth. The humidity response rate of cracked concrete increases with the increase of the water-cement ratio, and the humidity response rate of concrete without fly ash is the fastest, followed by the concrete with the fly ash content of 30% and 15%. Moreover, there are differences in the significance of the effect of cracks on the internal humidity response of concrete with different water-cement ratios and fly ash contents.

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Last Update: 2021-05-20