Improving Carbon Sequestration, Mechanical Properties and Thermal Insulation of RMFC by Foaming with H2O2 and Carbonization Curing
LIU Kuizhou1,2, ZHANG Jianren1,3, TIAN Xiang1,3, HUANG Dunwen1,3, PENG Hui1,3,*
1 School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha 410114, China 2 College of Civil Engineering, Hunan University, Changsha 410082, China 3 Key Laboratory of Safety Control of Bridge Engineering of Ministry of Education, Changsha University of Science and Technology, Changsha 410114, China
Abstract: Developing new low-carbon cementitious materials to replace high-energy consumption and carbon emission ordinary Portland cement is one of the critical approaches for carbon reduction in the cement and construction industries. In this study, we prepared a rapidly carbon-sequestering and thermally insulating material, reactive magnesium oxide foam concrete (RMFC), by foaming reactive magnesium oxide cement (RMC) with H2O2 and curing with CO2. We investigated the influence of factors such as water-ash ratio, H2O2 dosage, and H2O2 preheating temperature on the foaming behavior of RMC paste. Additionally, we studied the effects of porosity, curing conditions, and carbonation time on the carbonation behavior of RMFC, and analyzed the mechanisms governing the impact of porosity, curing conditions, and carbonation time on the mechanical and thermal insulation properties of RMFC. The results showed that by appropriately increasing the water-ash ratio, we could extend the initial setting time of RMC paste, while preheating H2O2 enhanced its decomposition rate, enabling the production of high-porosity RMFC. Furthermore, increasing porosity, elevating CO2 concentration, and reducing carbonation temperature significantly enhanced the CO2 sequestration rate. Different curing temperatures led to variations in carbonation products. Reducing porosity or increasing the carbonation level resulted in higher strength but higher thermal conductivity in RMFC. Through experimentation, we achieved RMFC with densities ranging from 635 kg/m3 to 1 335 kg/m3, compressive strengths between 3.75 MPa and 9.1 MPa, and thermal conductivities of 0.32 W/(m·K) to 0.49 W/(m·K) after carbonation curing for 12 h to 48 h. The proposed method for RMFC preparation demonstrated a substantial CO2 sequestration effect, with a maximum CO2 sequestration of 0.42 tons per ton of RMC. Replacing ordinary Portland cement foam concrete with RMFC has the potential to contribute to carbon emissions reduction in the cement and construction industries.
通讯作者:
* 彭晖,长沙理工大学土木工程学院教授、博士研究生导师。1999年湖南大学本科毕业,2002 年湖南大学硕士毕业,2006 年湖南大学博士毕业。目前主要从事预应力FRP增强混凝土结构的力学和耐久性能、高性能无机胶凝材料的合成及结构工程应用、土木工程低碳智能建维关键技术等方面的研究。在Engineering Structures、Cement and Concrete Composites、ASCE Journal of Materials in Civil Engineering等期刊上发表论文80余篇,其中SCI收录20余篇,EI收录40多篇。先后获得国家科技进步二等奖、湖南省科技进步一、二等奖、中国公路学会科学技术二等奖等科技奖励8项,其中主持完成的“基于预应力CFRP的桥梁性能提升技术”获得2016年度中国公路学会科学技术二等奖。Huipeng@csust.edu.cn
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2023, Vol. 37 
