Linbo Jiang , Zhi Wang , Hongzhi Xu , Zheng Wang , Jinghang Niu , Yuan Wang , Qi Yang , Jihui Qin
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引用次数: 0
Abstract
This study employed nano-silica (NS) and nano-calcium carbonate (NC) to stabilize CO2 foam, which was subsequently employed in the production of CO2 foamed concrete (CFC). The impacts of varying dosages of NS and NC on the characteristics of CO2 foam and the properties and microstructure of CFC were investigated. The incorporation of NS and NC significantly enhanced the stability of CO2 foam, with optimal foam stability achieved at content of 1 % for NS and 1.5 % for NC, respectively. The fluidity of fresh CFC paste exhibited a gradual decline as the content of nanoparticles increases. In addition, when the foam was optimal stable, the strength of CFC can be increased by 36 % and CO2 uptake by 1.8 % on average. NS owing to its crystal nucleus effect and volcanic ash effect, concurrently facilitated both hydration and carbonation processes. This dual action effectively filled the defects present on the pore walls and enhanced the strength. Whereas NC acted as a nucleation site effect for calcium carbonate formation, further advancing the carbonation process and reinforcing the strength of the pore walls. Above effects to varying degrees significantly reduced the pore throat radius, length and the number of interconnected pores of CFC, and optimized the pore size distribution, uniformity and sphericity, thereby reducing the water absorption rate of CFC and enhancing its mechanical properties.
期刊介绍:
Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development.
The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.