复合硅酸盐水泥的生命周期评价

掺加大量工业废渣的复合硅酸盐水泥其生产过程对生态环境有重要的影响.因此,本文利用Gabi 4.4软件,对复合硅酸盐水泥进行生命周期评价,比较分析生命周期各生产阶段中的非生物资源耗竭、全球变暖潜值、酸化效应、富营养化、人体毒性及光化学臭氧生成潜力等主要环境影响类型.结果表明,全球变暖潜值是复合硅酸盐水泥环境影响的主要类型,占总环境影响值的71％.环境影响大小顺序依次为全球变暖潜值、酸化效应、非生物资源耗竭、人体毒性、富营养化和光化学臭氧生成潜力.煅烧阶段的环境影响是最严重的,占整个生命周期影响值的68％.各生产阶段环境影响大小顺序依次为煅烧阶段、水泥粉磨、运输阶段、生料制备和原料开采阶段.煅烧阶段的全球变暖潜值、非生物资源耗竭和酸化效应的影响值为水泥生产各阶段最高值;粉磨阶段相比其他阶段具有最高的人体毒性和光化学臭氧生成潜力影响值;运输阶段产生了最高的富营养化污染值.本文对复合硅酸盐水泥的研究,为中国水泥生命周期评价提供了有效的基础数据,同时为推动水泥行业和建筑业的可持续发展提供了科学依据.

Life cycle assessment of composite portland cement

Composite Portland Cement (CPC) mixed with industrial residues has a destructive impact on ecological environment. This paper presents a life cycle assessment (LCA) of CPC using Gabi 4.4 and evaluates the environmental impact potentials during the production of cement. The parameters including Abiotic Depletion (ADP), Acidification Potential (AP), Eutrophication Potential (EP), Global Warming Potential (GWP), Human Toxicity Potential (HTP) and Photochemical Ozone Creation Potential (POCP) are analyzed and compared. The results show that, compared to other environmental impact potentials, the GWP potential is the most influenced factor, with the contribution proportion of 71%. Regarding the extent of environmental impacts, these parameters can be ordered as: GWP, AP, ADP, HTP, EP and POCP. Compared to other stages, calcination stage exerts the most destructive influence on the environment, with the contribution proportion of 68%. Regarding the extent of environmental impacts, the stages can be ordered as: calcination stage, grinding stage, transport, raw material preparation and raw material mining. The highest GWP, ADP and AP values are generated during calcination stage, the highest HTP and POCP values during grinding stage and the highest EP value during transport stage. This paper discusses the LCA of CPC to provide data for LCA of cement in China and to promote the sustainable development pattern for cement and construction industry.