Effects of organic admixtures on super long-term stability of cement-based artificial barrier for radioactive waste disposal facility

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06170
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Nihon University
• Principal Investigator: UMEMURA Yasuhiro 日本大学, 理工学部, 教授 (70246825)
• Co-Investigator(Kenkyū-buntansha): 小泉 公志郎 日本大学, 理工学部, 准教授 (10312042) ; 佐藤 正己 日本大学, 理工学部, 准教授 (50580164)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: コンクリート / セメント / 高性能減水剤 / 水和反応 / ケイ酸カルシウム水和物 / ケイ酸構造 / 空隙構造

Outline of Final Research Achievements

This study clarified the influence of high performance water reducing agent (superplasticizer) which is an organic chemical admixture on super long term stability of cement based artificial barrier used for radioactive waste disposal facility.　As a result, it was revealed that a difference of about 20% in the compressive strength for 1 year of age occurs due to the difference in the type of high performance water reducing agent and the addition rate. Furthermore, the correlation between the compressive strength and the amount of calcium silicate hydrate , the degree of polymerization of the silicate chain length and the amount of fine voids was found, and the necessity of examining the structural strength of the calcium silicate hydrate It became clear.

Free Research Field

コンクリート工学