Water absorption properties of concrete after freeze-thaw damages

被引：0

作者：

Zhang P. ^{[1
]}

Zhang L.-S. ^{[1
]}

Zhao T.-J. ^{[1
]}

Wittmann F.H. ^{[1
,2
]}

Lehmann E. ^{[3
]}

Jin Z.-Q. ^{[1
]}

机构：

[1] School of Civil Engineering, Qingdao Technological University

[2] Aedificat Institute Freiburg

[3] Department of Spallation Neutron Source, Paul Scherrer Institute

来源：

Jianzhu Cailiao Xuebao/Journal of Building Materials | 2011年 / 14卷 / 02期

关键词：

Dynamic elastic modulus; Freeze-thaw damage; Neutron radiography; Water absorption; Water penetration depth;

D O I：

10.3969/j.issn.1007-9629.2011.02.002

中图分类号：

学科分类号：

摘要：

Concrete without and with addition of air entrainment have been exposed to freeze-thaw cycles; the influence of frost damages on water absorption properties of concrete was investigated through water absorption test and neutron radiography. Results indicate that by means of neutron radiography the process of water absorption of non-transparent concrete can be observed visually and analyzed quantitatively. For concrete without air entrainment, the dynamic elastic modulus decreases about 14% after only 10 freeze-thaw cycles due to its low frost resistance. Under this condition, water penetration depth into concrete increases by 30%. For the concrete with addition of air entrainment, the dynamic elastic modulus hardly decreases even after 200 freeze-thaw cycles. However, after 200 freeze-thaw cycles part of the surfaces of concrete specimens scale off, which results in higher penetration rate and penetration depth of water. Therefore, the influence of frost damages on water absorption properties of concrete also has to be taken into account when the damage degree of frost action is evaluated, in addition to the decreasing of dynamic elastic modulus.

引用

页码：155 / 159+195

共 10 条

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