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http://dx.doi.org/10.14190/JRCR.2017.5.4.421

Prediction for Pore Structure of Cement Mortar Exposed to Freezing-Thawing Action by Ultrasonic Pulse Velocity Measurement  

Pang, Gi-Sung (Architectural and Environmental System Engineering, Sungkyunkwan University)
Lee, Kwang-Myong (Architectural and Environmental System Engineering, Sungkyunkwan University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.5, no.4, 2017 , pp. 421-426 More about this Journal
Abstract
In this paper, the effect of freezing-thawing action on the dynamic modulus and porosity was examined by ultrasonic pulse velocity (UPV) measurement. UPV was measured every 30 cycles during the freezing-thawing test, and dynamic modulus and porosity of cement mortar were calculated by relationship among UPV, porosity and dynamic modulus. Porosity analysis was also performed to compare with calculated porosity by mercury intrusion porosimetry (MIP). From the test, it was found that dynamic modulus of cement mortar was decreased 13% after 300 cycles. The calculated porosity was increased about 30% compared with the initial porosity before freezing-thawing action. The calculated porosity showed similar increase tendency with the porosity measured by MIP. So, it can be concluded that the porosity change of cementitious materials by freezing-thawing action can be predicted by UPV measurement.
Keywords
Freezing-thawing action; Pore structure; Durability; Cementitious materials;
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Times Cited By KSCI : 4  (Citation Analysis)
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