摘要详情

ID / 提交时间

57 / 2022-03-31 13:29:05

标题

Carbon Footprint Analysis of Graphene Nanofluid Additive Modified Cement Materials Based on LCA Evaluation

关键字

graphene,LCA,low carbon concrete,modified cement,surfactant

主题及专题

Special session: Sustainable construction materials towards carbon neutrality

状态

全文待审

作者

智健姚 / Shenzhen University；College of Civil and Transportation Engineering；Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering

arina C / Shenzhen University；College of Civil and Transportation Engineering；Guangdong Probvincal Key Laboratory of Durability for Marine Civil Engineering

Jihua Zhu / Shenzhen University；Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering； College of Civil and Transportation Engineering

摘要

The production of concrete accounts for about 5-7% of global carbon emissions. Graphene-modified concrete possesses higher mechanical strengths and longer service life than conventional concrete, and its application can make structures stronger and more durable，so less concrete is required to achieve the same structural strength, which may greatly increase save on building materials, resulting in a smaller carbon footprint. Among many assessment methods, life cycle assessment (LCA) is common and representative. Existing literature shows that surfactants such as polyvinyl alcohol (PVA), polycarboxylate superplasticizer (PCE), and sodium carboxymethyl cellulose (CMC) exhibit excellent dispersion and stabilization ability during the preparation of GNAs by liquid phase exfoliation. In order to explore the feasibility of graphene nanofluidic additives (GNAs) modified cement materials in low carbon concrete, the carbon emissions and other environmental impacts(Global warming potential, Acidification potential,etc) of modified cement materials prepared by three different GNAs were quantitatively analyzed by LCA(compared to conventional cement).This paper constructed a mathematical model for the LCA of GNAs modified cement. This model covers the whole “from cradle to grave” process from material acquisition, processing, and use to waste. Meanwhile, the database of GaBi and other software is used to carry out the full LCA of GNAs modified cement materials. Finally, the strength of GNAs modified cement materials was tested, and the material strength and carbon emission were taken as key factors to conduct comparative analysis with conventional cement. The evaluation calculation results show that compared with conventional cement, GNAs modified cement material can achieve the Optimized combination of material strength and carbon emission, and the GNAs modified cement material prepared with PCE surfactant has the best comprehensive evaluation. This indicates that GNAs modified cement material can be applied to improve concrete production technology, which will reduce the negative environmental impact and achieve green production.