Designing low-carbon ultra-high performance concrete with co-combustion ash of sewage sludge and rice husk

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-12-06 DOI:10.1617/s11527-024-02535-3

Yan Xia, Daquan Shi, Yading Zhao, Jian Wang, Xiaobing Ma, Kunyang Yu, Huanyu Li, Lei Wang, Jianhua Yan

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Abstract

Ultra-high performance concrete (UHPC) exhibits excellent mechanical properties and durability. However, UHPC requires high content of cementitious materials, associating with high carbon footprints and economic cost. This study aimed to investigate the effects of co-combustion ash of sewage sludge and rice husk (CCA) in UHPC on the hydration mechanism, microstructure, mechanical properties and environmental impact. CCA-based UHPCs were designed by replacing cement or SF with CCA at replacement percentages of 5, 10, 15 and 20 wt%. The results indicated that CCA exhibited excellent pozzolanic reactivity. The maximum compressive strength of CCA-based UHPC exceeded 130 MPa. The total reaction degree of cementitious materials was increased by the incorporation of 10 wt% CCA, thus enhancing the strength development of UHPCs. Besides, additional C–A–S–H gels generated via the pozzolanic reaction of CCA, which increased the length of silicate chain of C–A–S–H gels and refined the pore structure of CCA-based UHPCs. Life-cycle assessment results revealed that replacing 20 wt% cement with CCA could reduce carbon emissions and fossil fuel depletion of UHPCs by 12% and 16%, respectively. Hence, the innovative approach of this study can recycle CCA to manufacture UHPCs with excellent performance and environmental benefits.

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污水污泥与稻壳混烧灰低碳超高性能混凝土的设计

超高性能混凝土（UHPC）具有优异的力学性能和耐久性。然而，UHPC需要高含量的胶凝材料，与高碳足迹和经济成本相关。研究污泥与稻壳共燃灰（CCA）对UHPC水化机理、微观结构、力学性能及环境影响的影响。基于CCA的UHPCs设计方法是用CCA替代水泥或SF，替代比例分别为5%、10%、15%和20% wt%。结果表明，CCA具有良好的火山灰反应性。cca基UHPC的最大抗压强度超过130 MPa。掺入10%的CCA可提高胶凝材料的总反应度，从而促进UHPCs的强度发展。此外，通过CCA的火山灰反应生成额外的C-A-S-H凝胶，增加了C-A-S-H凝胶的硅酸盐链长度，使CCA基UHPCs的孔隙结构更加精细。生命周期评估结果显示，用CCA替代20%的水泥可以使UHPCs的碳排放和化石燃料消耗分别减少12%和16%。因此，本研究的创新方法可以回收CCA来制造具有优异性能和环境效益的UHPCs。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.