Study on internal water repellency and mechanical characteristics of cementitious materials with the addition of hydrophobic agent

• Asamoto Shingo

  埼玉大学 大学院理工学研究科

• Furuta Haruka

  首都高速株式会社

• Luan Yao

  埼玉大学 大学院理工学研究科

• Yoneda Taiju

  前田建設工業株式会社 技術研究所

Bibliographic Information

Other Title

• 撥水材を混入したセメント系材料の内部撥水性と材料特性の検討

Abstract

In order to inhibit water penetration into concrete, hydrophobic surface impregnation is generally used to protect concrete, but there is concern that water repellency may decrease greatly when cracks occur. This study aims to develop an internal hydrophobic cementitious material by mixing several hydrophobic agents. Two mixing methods of the agents, direct mixing and sand spraying, were carried out. It was found that mortar with sand sprayed with silicone-based agent had a relatively high contact angle and hydrophobicity under wetting and drying cycles even if cracks occurred, although compressive strength decreased to some extent. Further, mortar with the addition of an alkyl-modified siloxane agent could greatly inhibit the water penetration after partial drying, and drying shrinkage was also found to be smaller than that of normal mortar.

Journal

• Concrete Research and Technology

  Concrete Research and Technology 29 (0), 11-19, 2018

  Japan Concrete Institute

Keywords

• Water repellency agent
• Internal water repellency
• Contact angle
• Inhibition of water penetration
• Drying shrinkage

Details

• CRID: 1390001204405719808
• NII Article ID: 130006309080
• DOI: 10.3151/crt.29.11
• ISSN: 21862745
• ISSN: 13404733
• Web Site: https://www.jstage.jst.go.jp/article/crt/29/0/29_11/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed