Action of Hydraulic Pressure on Portland Cement Mortars - Current Understanding and Related Progress of the First-Ever In-Situ Deep Sea Tests at a 3515 m Depth

DOI Web Site 4 Citations 17 References Open Access
  • Takahashi Keisuke
    Technical Development Center, Ube Industries, Ltd., 1-6 Okinoyama Kogushi, Ube, 7558633, Japan.
  • Kawabata Yuichiro
    Structural Engineering Field, Port and Airport Research Institute, National Institute of Maritime, Port and Aviation Technology.
  • Kobayashi Mari
    Technical Development Center, Ube Industries, Ltd., 1-6 Okinoyama Kogushi, Ube, 7558633, Japan.
  • Gotoh Shinpei
    Department of Marine Electronics and Mechanical Engineering, Tokyo University of Marine Science and Technology.
  • Nomura Shun
    Department of Mathematical Science and Advanced Technology, Japan Agency for Marine-Earth Science and Technology.
  • Kasaya Takafumi
    Research Institute for Marine Resources Utilization Submarine Resources Research Center, Japan Agency for Marine-Earth Science and Technology.
  • Iwanami Mitsuyasu
    Department of Civil and Environmental Engineering, Tokyo Institute of Technology.

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Other Title
  • Action of hydraulic pressure on Portland cement mortars and related progress of the first-ever in-situ deep sea tests at a 3,515 m depth

Abstract

<p>In order to realize the utilization of cement-based materials in the special extreme environment, the deep sea, the authors have launched a project targeted at creating a technology platform with in-situ methods and systems for monitoring and evaluating cement-based materials located at deep ocean bottom sites. The first in-situ test in the world with a view to investigating the time-dependence of the volumetric stability and microstructure of Portland cement mortar following its long-term exposure to deep-sea conditions is currently underway at a 3515-m depth in the Nankai Trough. This paper reviews previous studies about the influences of deep-sea hydraulic pressure on cement-based materials, verifies the action of short-term hydraulic pressure using Portland cement mortars on a laboratory scale, and introduces the ongoing progress of in-situ deep-sea tests. Results from laboratory tests indicate that dimensional changes were provoked by liquid water infiltration and confinement while under short-term hydraulic pressure, however, time-dependent behavior under stresses such as creep has not appeared. Weight gain, changes in pore-size distribution, compressive strength and bending strength of the cement mortar were monitored after pressurization and depressurization processes.</p>

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