Comparison and assessment of carbon dioxide emissions between alkali-activated materials and OPC cement concrete

IF 7.4 2区 工程技术 Q1 ENGINEERING, CIVIL
Peiliang Cong, Ruyan Du, Huanlin Gao, Zhihui Chen
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Abstract

Geopolymer concrete (GPC) has been developed as a sustainable alternative to traditional cement-based concrete using industrial waste materials. Thus, reducing greenhouse gas emissions in concrete production can be expected. This study employed the life cycle assessment (LCA) method to evaluate geopolymer concrete's cost and life-cycle carbon dioxide (CO2) emissions. Moreover, the critical transportation radius of the geopolymer is estimated. Then, evaluation results were compared with ordinary Portland cement (OPC), considering three concrete construction methods: cast-in-place, ready-mixed, and precast. In particular, the service life of two types of concrete in sulfuric acid environments is considered. Compared with OPC concrete, the results show that geopolymer concretes can significantly reduce the cost and CO2 emissions when one or a small amount of alkali activator is used or alkali-containing materials are used to replace some alkali activators. However, the advantages would be reversed by the rising alkali dosages, which account for cost increases and carbon emissions. When considering the service life in special environments, geopolymer concrete in sulfuric acid environments corresponds to fewer carbon emissions, 94%–97% decreased compared with OPC concrete. Finally, compared with OPC concrete, the newly developed limestone calcined clay cement (LC3) avoids high-temperature calcination and dramatically reduces carbon dioxide emissions. Compared to OPC concrete, LC3 concrete has a 19% reduction in CO2 emissions. And geopolymer concrete that takes alkali-activate materials for superseding alkalis also produces less carbon dioxide emissions. In particular, CO2 emissions from FA-SF geopolymer concrete are approximately 50% lower than OPC concrete. In addition, the use of alkali activators significantly weakens the cost advantage of geopolymers. But after accounting for waste disposal costs, the average net cost of fly ash-based geopolymer concrete can be more than 30% lower than that of OPC concrete. The average net cost of slag-based geopolymer concrete is 7%–45% lower than that of OPC concrete. The findings of this work provide the basis for further development of geopolymer concretes obeyed environmental protection.

Abstract Image

碱活性材料与 OPC 水泥混凝土二氧化碳排放量的比较与评估
土工聚合物混凝土(GPC)是利用工业废料作为传统水泥混凝土的可持续替代品而开发的。因此,有望减少混凝土生产过程中的温室气体排放。本研究采用生命周期评估(LCA)方法对土工聚合物混凝土的成本和生命周期二氧化碳(CO2)排放量进行了评估。此外,还估算了土工聚合物的临界运输半径。然后,将评估结果与普通硅酸盐水泥(OPC)进行了比较,并考虑了三种混凝土施工方法:现浇、预拌和预制。特别是考虑了两种混凝土在硫酸环境中的使用寿命。结果表明,与 OPC 混凝土相比,当使用一种或少量碱活化剂,或使用含碱材料替代某些碱活化剂时,土工聚合物混凝土可显著降低成本和二氧化碳排放量。然而,碱用量的增加会导致成本上升和碳排放量增加,从而使上述优势发生逆转。考虑到特殊环境下的使用寿命,土工聚合物混凝土在硫酸环境下的碳排放量比 OPC 混凝土少 94%-97%。最后,与 OPC 混凝土相比,新开发的石灰石煅烧粘土水泥(LC3)避免了高温煅烧,大大减少了二氧化碳排放量。与 OPC 混凝土相比,LC3 混凝土的二氧化碳排放量减少了 19%。而采用碱活性材料取代碱的土工聚合物混凝土也减少了二氧化碳排放量。其中,FA-SF 土工聚合物混凝土的二氧化碳排放量比 OPC 混凝土低约 50%。此外,碱活化剂的使用大大削弱了土工聚合物的成本优势。但在考虑废物处理成本后,粉煤灰基土工聚合物混凝土的平均净成本可比 OPC 混凝土低 30% 以上。矿渣基土工聚合物混凝土的平均净成本比 OPC 混凝土低 7%-45%。这些研究结果为进一步开发符合环保要求的土工聚合物混凝土提供了依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
13.60
自引率
6.30%
发文量
402
审稿时长
15 weeks
期刊介绍: The Journal of Traffic and Transportation Engineering (English Edition) serves as a renowned academic platform facilitating the exchange and exploration of innovative ideas in the realm of transportation. Our journal aims to foster theoretical and experimental research in transportation and welcomes the submission of exceptional peer-reviewed papers on engineering, planning, management, and information technology. We are dedicated to expediting the peer review process and ensuring timely publication of top-notch research in this field.
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