Application of high-slag cement for reducing CO₂ emissions in grid-form deep cement mixing walls

Abstract

Reducing CO₂ emissions is a critical concern in addressing global climate change. In Japan, CO₂ emissions from cement production constitute approximately 3% of the country's total CO₂ emissions. This study investigates a technological system designed to significantly reduce CO₂ emissions in cement production. The system involves the development of blast furnace slag high-content cement and its application in concrete structures and ground improvement. This paper provides a detailed explanation of the development process of high-slag cement and presents experimental results from laboratory tests on ground improvement using this material. The developed high-slag cement was subsequently applied to ground improvement in grid-form deep cement mixing walls as a liquefaction countermeasure. The compressive strength of the ground improved with high-slag cement exceeded that achieved with an alternative type B blast furnace slag cement. Based on laboratory and in-situ results, high-slag cement was confirmed to be well-suited for ground improvement.