Temperature-Dependent Water Redistribution from Large Pores to Fine Pores after Water Uptake in Hardened Cement Paste

• Kiran Rohith

  Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan.

• Samouh Hamza

  Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan.

• Igarashi Go

  Graduate School of Engineering, The University of Tokyo, Tokyo, Japan.

• Haji Tatsuto

  Taiheiyo Cement Corporation, Chiba, Japan.

• Ohkubo Takahiro

  Graduate School & Faculty of Engineering, Chiba University, Chiba, Japan.

• Tomita Sayuri

  Taiheiyo Consultant, Co. Ltd., 2-4-2 Osaku, Sakura city, Chiba prefecture, Japan.

• Maruyama Ippei

  Graduate School of Engineering, The University of Tokyo, Tokyo, Japan. Graduate School of Environmental Studies, Nagoya University, ES-546, Furo-cho, Chikusa-ku, Nagoya, Japan.

Abstract

During sorption, the microstructural evolutions of two different cement pastes (with water-to-cement ratios of 0.40 and 0.55) are studied via proton-nuclear-magnetic-resonance relaxometry. The water uptake test is performed for samples dried at 105°C under three different temperatures of 20°C, 40°C, and 60°C for the first twenty-six days of sorption. It is observed that the water went first to the larger pores before migrating to the finest ones. This behavior is accelerated with increasing temperature. The rate of water exchange between fine and large pores is estimated and found to increase with temperature for both studied mixtures. The activation energy corresponding to this water movement is calculated and found to be higher for the lowest water-to-cement ratio, owing its finer microstructure. Finally, the activation energy related to the local water transport in re-distribution from large pores to fine pores is calculated and found to be inferior to the experimental results, which can be explained by the dynamic microstructure not being considered in the classical theories.

Journal

• Journal of Advanced Concrete Technology

  Journal of Advanced Concrete Technology 18 (10), 588-599, 2020-10-10

  Japan Concrete Institute

Keywords

• General Materials Science
• Building and Construction

Details

• CRID: 1390004222634194944
• NII Article ID: 130007925201
• DOI: 10.3151/jact.18.588
• ISSN: 13473913
• ISSN: 13468014
• Web Site: https://www.jstage.jst.go.jp/article/jact/18/10/18_588/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed