DEVELOPMENT OF CARBON DIOXIDE SEQUESTRATION TECHNOLOGY IN CONCRETE

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656323
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Building structures/materials
• Research Institution: Yamaguchi University
• Principal Investigator: LI ZHUGUO 山口大学, 理工学研究科, 准教授 (50432737)
• Co-Investigator(Kenkyū-buntansha): MATSUO Eiji 九州産業大学, 工学部, 准教授 (10284267)
• Research Collaborator: TANIGAWA Yasuo 名古屋大学, 名誉教授
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 気泡コンクリート / 二酸化炭素固定 / アルカリ性 / 力学性能 / 炭酸塩化反応 / 炭酸ガス漏れ

Outline of Final Research Achievements

In this study, a new method for sequestrating CO2 was developed, which encloses CO2 bubbles into foamed concrete. The setting time, strength, water absorption, drying shrinkage, alkalinity, CO2 uptake caused by the carbonation, and micro-structure, leakage of CO2, etc. of CO2 -foamed concrete (CFC) mixing with different kinds of cement were investigated.
The experimental results show that (1) Mixing CO2 bubbles into concrete didn’t harm the setting and mechanical performances, and didn’t increase the water absorption and drying shrinkage of foamed concrete. (2) The pH of CFC with a long age even one year was kept to be more than 11.5, when CO2 content was below 60% by volume, (3) most of the carbonation was caused by external CO2. Internal CO2 bubbles yielded a little increase of CaCO3, (4) leakage of CO2　was very few when CO2 content was less than 60%, and (4) CO2 sequestration in CFC was mainly structural trapping rather than carbonation.

Free Research Field

建築材料