松井 秀岳*1・青木 智幸*2・大脇 英司*3・藤原 斉郁*1・池上 浩樹*1



*1 技術センター 社会基盤技術研究部 地盤研究室
*2 技術センター 社会基盤技術研究部
*3 技術センター T-eConcrete実装プロジェクトチーム

Development of Environment-friendly Ground Improvement Technique for Reducing Carbon Dioxide Emissions

Laboratory Mixing Test for Diaphragm Wall and Trial Mixing for Soil Cement Stabilization

Hidetake MATSUI*1, Tomoyuki AOKI*2, Eiji OWAKI*3, Tadafumi FUJIWARA*1 and Hiroki IKEGAMI*1

“Environment-friendly concrete” is being studied and practically used in the concrete field to contribute toward the realization of carbon neutrality in 2050. This technique can significantly reduce CO2 emissions by using low CO2 emissions binder, mainly composed of blast furnace slag, as an alternative to cement-based binder. The authors are developing an "Environment-friendly ground improvement technique" by applying this binder to ground improvement. For application to ground improvement, it is necessary to confirm the applicability of the binder, such as whether or not it can achieve the required performance, which differs depending on the improvement method. This paper describes laboratory mixing tests for the diaphragm wall method and the soil cement stabilization method, as examples of verification of the binder’s applicability. Through these tests, it was confirmed that improved soil using the binder could be produced by the same procedures and methods normally adopted for cement-based ground improvement. In addition, some mix proportions using the binder were specified that satisfy the general required material properties for the diaphragm wall method.

Keywords: ground improvement, carbon neutrality, low carbon technology, blast furnace slag, diaphragm wall, soil cement stabilization

*1 Geotechnical Research Section, Infrastructure Technology Research Department, Taisei Advanced Center of Technology
*2 Infrastructure Technology Research Department, Taisei Advanced Center of Technology
*3 T-eConcrete Implementation Project Team, Taisei Advanced Center of Technology