The 3rd Construction Material, the Study on Mechanism of Strength Mobilization of Cement-Treated Soil

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289146
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Hiroshima University
• Principal Investigator: Tsuchida Takashi 広島大学, 工学(系)研究科(研究院), 教授 (10344318)
• Co-Investigator(Kenkyū-buntansha): NAKARAI KENICHIRO 広島大学, 大学院工学研究院, 准教授 (10359656)
• Research Collaborator: Tang Y. X. 関門港湾建設(株), 技術課長
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: セメント固化処理土 / 浚渫土 / 海成粘土 / 一軸圧縮強度 / 含水比 / セメント添加率 / 港湾 / 養生時間

Outline of Final Research Achievements

A formula to estimate unconfined compressive strength of cement-treated marine clays is proposed. In the proposed formula, the strength of cement-treated soil is given by volumetric solid content, strength increase coefficient due to cement, and exponential parameter N representing the effect of the void structure of soil and cement content on the solid material of soil. On comparing the estimates with those using a conventional formula based on water cement ratio, the proposed formula generated better-fit estimates. On the basis of the results obtained from the laboratory tests, it was found that the strength mobilization process can be divided into two stages; first stage within 3 days after curing (the early stage of curing) and the second stage 3 days after the curing. Two equations to evaluate strength during early stages of curing were proposed based on the normalized initial water content and normalized specific volume ratio.

Free Research Field

地盤工学