会議発表論文 Laboratory investigation of soilcrete created from Mekong Delta's soils mixed with cement slurry

北詰, 昌樹  ,  Kitazume, Masaki

内容記述
The Mekong Delta is formed from the low stream of the Mekong River in the Vietnam land. Earth levees in the Mekong Delta constructed to protect rice fields have often broken due to annual floods. An Giang and Dong Thap province locating in the Vietnam-Cambodia border have faced directly annual floods. Deep mixing methods (DMM) have high potential to reinforce earth levees effectively and sustainably but limit application in the Mekong Delta. This paper investigates behaviors of soilcrete created in laboratory using Mekong Delta’s soils mixed with cement slurry to create database for DMM practical applications. About 160 soilcrete specimens were made from Mekong Delta’s soils mixed with cement slurry at several cement contents and cured at various durations. Unconfined compressive strength (UCS, qu) test results indicate that (1) qu at a curing time of 28 days increases 7 to 30 times to those of the in-situ soils, respectively; (2) qu_7/qu_28, qu_60/qu_28, and qu_90/qu_28 ratios are 0.6, 1.6, and 2.0, respectively; (3) secant modulus of elasticity is 50 to 350 times qu; (4) low failure strain of soilcrete specimens is about 1.3% or brittle failure; and (5) a cement content of 200-250 kg/m3 (for ordinary Portland cement) is suitable for almost all soil types in the Mekong Delta.

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