ACTION MECHANISM OF SHRINKAGE REDUCING AGENT IN HARDENED CEMENT PASTE

• MARUYAMA Ippei

  Assoc. Prof., Dept. of Environmental Engineering and Architecture, Nagoya Univ., Dr. Eng.

• KISHI Naoya

  Graduate Student, Dept. of Environmental Engineering and Architecture, Nagoya Univ.

Bibliographic Information

Other Title

• 収縮低減剤の作用機構

Abstract

Based on the disjoining pressure concept, volume change of hardened cement paste is investigated. As the hardened cement paste shows a hysteresis regarding adsorption and desorption isotherm, disjoining pressure of water in hardened cement paste was evaluated with the proposed equation led from equilibrium between disjoining pressure of water and elastic force of skeleton. As a result, all the relationships between averaged thickness of adsorbed water and disjoining pressure of water were on the same curve, and using this potential curve, volume change of hardened cement paste can be simulated. With the same concept, disjoining pressure curve was evaluated with cement paste containing shrinkage reducing agent, and it was experimentally confirmed that shrinkage reducing agent decrease the gradient of disjoining pressure curve and this curve cause the smaller shrinkage strain during drying process.

Journal

• Journal of Structural and Construction Engineering (Transactions of AIJ)

  Journal of Structural and Construction Engineering (Transactions of AIJ) 74 (645), 1895-1903, 2009

  Architectural Institute of Japan

Keywords

• <i>Shrinkage reducing agent</i>
• <i>Hardened cement paste</i>
• <i>Volume change</i>
• <i>Water content</i>
• <i>Disjoining pressure</i>

Details

• CRID: 1390282680580379008
• NII Article ID: 130004507693
• DOI: 10.3130/aijs.74.1895
• ISSN: 18818153
• ISSN: 13404202
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed