Hydrothermal mineralization enabled upgrading reuse of construction-generated sludge waste for sustainable building material production

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Developments in the Built Environment Pub Date : 2024-07-18 DOI:10.1016/j.dibe.2024.100507

Yao Du , Yuxuan Qi , Qihan Qiu , Haidong Zhang , Bo Li , Honghai Lou , Xincai Chen , Liangtong Zhan , Qiang Zeng

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Abstract

This work reports an upgrading reuse of construction-generated sludge waste (CGSM) to manufacture value-added building materials using hydrothermal mineralization (HM). The optimization of mixture proportions and the influential factors of curing temperature and duration were explored. Results showed that high-strength HM-CGSW blocks over 50 MPa with a strength-to-calcium ratio of 2.95 MPa/percentage can be produced under an optimal Ca/Si ratio of 0.5 and HM curing of 200 °C for 12 h. The production of HM-CGSW block would generate 305.81 kg e-CO₂/m³ and cost of 222.44 CNY/m³, lower than those of concrete block and autoclaved fly-ash block. An industrial application of HM-CGSW was proposed for upgrading use of CGSW to produce building materials for new constructions. The findings in this study would not only deepen the mechanistic understandings of HM treatment of sludge waste, but also shed much light on developing an industrial path that enables sustainable building material production.

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水热矿化技术实现了建筑污泥废物的升级再利用，用于可持续建筑材料生产

这项工作报告了利用水热矿化法（HM）对建筑产生的污泥废物（CGSM）进行升级再利用，以制造增值建筑材料。研究探讨了混合物比例的优化以及固化温度和固化时间的影响因素。结果表明，在最佳钙/硅比为 0.5、水热固化温度为 200 °C、固化时间为 12 小时的条件下，可生产出强度超过 50 MPa、钙强比为 2.95 MPa/percentage 的高强度 HM-CGSW 块体；生产 HM-CGSW 块体可产生 305.81 kg e-CO2/m3，成本为 222.44 元人民币/m3，低于混凝土砌块和蒸压粉煤灰砌块。研究提出了 HM-CGSW 的工业应用方案，以提升 CGSW 的利用率，生产新型建筑材料。本研究的结果不仅加深了对 HM 处理污泥废物的机理认识，而且为开发一条可持续生产建筑材料的工业化道路提供了许多启示。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.