Investigating the Mechanism of Carbonation on Different Concentration of Carbon Dioxide
In recent year, powder admixtured are used in the cement industry to reduce carbon dioxide emissions.Blast Furnace Slag powder (BFS) can be set at a high replacement rate, and the amount used is large.Cement using BFS has some merits, but it has low resistance to carbonation.Previous studies have reported that the progress of carbonation of concrete using ordinary portland cement and blast furnace cement is not equivalant.In Japan, according to Japanese industrial standarts, carbonation is determind through accelerated carbonation test, by making used of 5% of carbon dioxide at 60% humidities and 20℃ of temperature.But in reality there are some difference between the natural carbonation and accelerated carbonation.In this study, carbonation would be investigated on the hardened mortar made with slag cement and also clarify the mechanism of carbonation by carrying out different carbon dioxide concentration.We mainly focused on calcium hydroxide (CH) and C-S-H which are key products of hydrations that form carbonation.Considering the mechanism of carbonation between the natural environment and accelerated environment including the chemical characteristics of CH and C-S-H.
BFS Accelerated carbonation test Carbonation rate coefficient CH C-S-H
J.Nakamura T.Iyoda S.Goto
Shibaura Institute of Technology, Tokyo, Japan Yamaguchi university, Yamaguchi, Japan
国际会议
福州
英文
739-743
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）