Wet-carbonation-based Mineral Extraction and CO2 Sequestration Using Concrete Waste Fines at a Low Temperature

被引：10

作者：

Bui, Ngoc Kien ^{[1
]}

Kurihara, Ryo ^{[1
]}

Wang, Wei ^{[2
]}

Kanematsu, Manabu ^{[3
]}

Hyodo, Hikotsugu ^{[4
]}

Takano, Miku ^{[4
]}

Hirao, Hiroshi ^{[4
]}

Noguchi, Takafumi ^{[1
]}

Maruyama, Ippei ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Engn, Tokyo, Japan

[2] Southeast Univ, Sch Mat Sci & Engn, Nanjing, Peoples R China

[3] Tokyo Univ Sci, Fac Sci & Technol, Chiba, Japan

[4] Taiheiyo Cement Corp, Cent Res Lab, Sakura, Chiba, Japan

来源：

JOURNAL OF ADVANCED CONCRETE TECHNOLOGY | 2023年 / 21卷 / 03期

基金：

日本科学技术振兴机构;

关键词：

C-S-H; RECYCLED AGGREGATE CONCRETE; HYDRATED PORTLAND CEMENTS; ACCELERATED CARBONATION; PHYSICAL-PROPERTIES; MICROSTRUCTURE; DISSOLUTION; WATER; KINETICS; CONSTRUCTION;

D O I：

10.3151/jact.21.166

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study investigates the wet carbonation of concrete fines with CO2 and natural air gas bubbling in a carbonation system at low temperatures. After the air-and CO2-wet carbonations, the properties of a solution and hydrated cement paste powder are determined. In the air and CO2-wet carbonations, more Ca is extracted into the solution at a low tem-perature of 5 degrees C. This high Ca concentration in the solution through air-wet carbonation primarily originates from the portlandite and unhydrated phases of the cement paste. Even in solutions with high pH values, the rehydration process and C-S-H decomposition occur simultaneously in air-wet carbonation. Moreover, CO2-wet carbonation indicates that the decalcification of C-S-H occurs rapidly, even in the presence of portlandite. Air-wet carbonation presents a potential method for the direct air capture of CO2 using concrete waste fines in a short period.

引用

页码：166 / 188

页数：23

共 104 条

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