Development of Blended Cement using Chemical Admixture

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04551
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Shimane University
• Principal Investigator: ATARASHI DAIKI 島根大学, 学術研究院環境システム科学系, 准教授 (70431393)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 建設材料 / 廃棄物有効利用 / 二酸化炭素排出削減 / 資源循環型社会 / 低炭素社会 / 化学混和剤 / 添加剤 / 反応メカニズム

Outline of Final Research Achievements

In order to analyze the hydration reaction promoting mechanism of blast furnace slag (BFS) by additives, the effects of various additives on the hydration reaction in the BFS-Ca(OH)2 system were investigated focusing on calcium salts. As a result, in the case of gypsum, the reaction ratio of BFS didn’t change, but the combined water increased by producing ettringite. On the other hand, Ca(NO3)2,Ca(NO2)2 and CaCl2 produced highly soluble AFm phases, and showed the effect of significantly increasing both the reaction ratio of BFS and the combined water. We have concluded that the solubility of hydration product can be related to the promotion of the hydration reaction of BFS by the additive.

Free Research Field

無機材料工学、セメント化学

Academic Significance and Societal Importance of the Research Achievements

化学混和剤を使用し初期強度発現性を改善した汎用型混合セメントを開発することが可能となれば,混合セメントの生産量を増加させセメント産業からのCO2排出量削減と循環型資源有効利用を両立させることが可能となる.さらに本研究により開発された技術は諸外国にも移転可能であり,低炭素化社会における海外のCO2排出権の獲得に対しても非常に重要であると考えられる.