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Advances in Materials Science and Engineering
Volume 2015, Article ID 610428, 10 pages
http://dx.doi.org/10.1155/2015/610428
Research Article

Analysis Technique on Water Permeability in Concrete with Cold Joint considering Micro Pore Structure and Mineral Admixture

1Department of Architectural Engineering, Wonkwang University, 460 Iksan Daero, Iksan 570-749, Republic of Korea
2Department of Architecture & Interior Design, Woosuk University, 66 Jincheon, Daehakro 365-803, Republic of Korea
3Department of Civil Engineering, Hanseo University, 46 Hanseo 1 Ro, Chungnam 356-953, Republic of Korea
4Department of Civil and Environmental Engineering, Hannam University, 133 Ojeong-dong, Daedeok-gu, Daejeon 306-791, Republic of Korea

Received 16 April 2015; Revised 14 July 2015; Accepted 2 August 2015

Academic Editor: Luciano Lamberti

Copyright © 2015 Se-Jin Choi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Cold joint in concrete due to delayed concrete placing may cause a reduced shear resistance and increased water permeation. This study presents an analytical model based on the concept of REV (Representative Element Volume) to assess the effect of water permeability in cold joint concrete. Here, OPC (Ordinary Portland Cement) concrete samples with cold joint are prepared and WPT (Water Permeability Test) is performed on the samples cured for 91 days. In order to account for the effect of GGBFS (Granulated Ground Blast Furnace Slag) on water permeability, concrete samples with the same W/B (Water to Binder) ratio and 40% replacement ratio of GGBFS are tested as well. Utilizing the previous models handling porosity and saturation, the analysis technique for equivalent water permeability with effective cold joint width is proposed. Water permeability in cold joint increases to 140.7% in control case but it decreases to 120.7% through GGBFS replacement. Simulation results agree reasonably well with experimental data gathered for sound and cold joint concrete.