DRAINAGE EFFECT AFTER PLACING ON THE COMPRESSIVE STRENGTH OF SLURRY MORTAR WITH LANDSLIDE SEDIMENT

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  • HORIGUCHI Itaru
    NATIONAL INSTITUTE OF TECHNOLOGY（KOSEN）, KURE COLLEGE, Department of Civil and Environmental Engineering（2-2-11, Agaminami, Kure-shi, Hiroshima 737-8506, Japan）
  • MIMURA Yoichi
    NATIONAL INSTITUTE OF TECHNOLOGY（KOSEN）, KURE COLLEGE, Department of Civil and Environmental Engineering（2-2-11, Agaminami, Kure-shi, Hiroshima 737-8506, Japan）

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Other Title
  • スラリー状にした土砂モルタルの圧縮強度に及ぼす型枠存置中の水抜き効果

Abstract

<p>Heavy rain in late June through mid-July 2018 caused southwestern Japan devastating and massive floods and landslides. Landslide sediment of about 8 million m3 was run off in a wide range of Hiroshima prefecture. The sediment was collected and ultimately ended up in a landfill at a final disposal site. Considering large amounts of costs and time on sediment transportation and selection of a final disposal site, the effective usage of sediment in disaster sites is needed for unexpected disasters. We thought that draining excessive water from slurry mortar, which was mixed sediment and cement with a lot of water, could produce the hardened mortar with high strength. In this study, the drainage effect after placing on compressive strength of slurry mortar with sediment was investigated. The landslide sediment and garden soil were prepared for production of drained and non-draining slurry mortar. The water permeable molds for drained specimens were made of stainless steel wire mesh while steel molds were used for non-draining specimens. The test results showed that the drained specimens had higher compressive strength than the non-draining specimens due to the drainage effect. The compressive strength of drained sediment mortar and garden soil mortar ranged 5 to 10N/mm2 and 5 to 15N/mm2, respectively.</p>

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