Valorization of municipal solid waste incineration bottom ash (MSWIBA) into cold-bonded aggregates (CBAs): Feasibility and influence of curing methods
Journal article, 2022

The municipal solid waste incineration bottom ash (MSWIBA) contains amounts of hazardous elements or composition, and its disposal to landfills may pose a serious threat to the ground water and soil. To reduce the environmental impact of MSWIBA, a novelty application into the utilization of MSWIBA for the manufacture of cold-bonded aggregates (CBAs) was investigated in this study. This study explored the impacts of curing systems on the comprehensive properties of CBAs. Furthermore, the hydrating phases of the designed CBAs were studied by X-ray diffractometer, and the micro characteristics of CBAs was analyzed by Scanning Electron Microscopy. The results show that CBAs produced from the MSWIBA had good properties with density of 1.75–1.98 g/cm3, moisture content of 0.78–16.48 %, water absorption of 3.99–14.02 % and compressive behavior of 1.6–4.8 MPa. Moreover, the heating water curing environment can significantly improve the comprehensive properties of CBAs. Specifically, the compressive strength of the CBAs under the 80 °C curing condition was increased by 74 %–113 %, and the water absorption rate was reduced by 3.4 %–8 %, compared with other curing regimes. Additionally, the XRD analysis showed that there are spinel phases in the CBAs compounds, which is beneficial to solidify the hazardous metals. Also, low-carbon CBAs also greatly reduce the amount of Cu and Pb leaching, which meets the limit requirements in the Chinese standards. Overall, application of MSWIBA as admixture in CBAs is an effective approach to recycle waste and replace natural aggregates. Meanwhile, this work can provide an insight for the production of eco-friendly LWAs.

Physical and micro properties

Heavy metal content

Waste recycling

Cold-bonded aggregates

Municipal solid waste incineration bottom ash

Curing methods

Compressive behavior

Author

Jun Liu

Shenzhen University

Zhenlin Li

Shenzhen University

Weizhuo Zhang

Shenzhen University

Hesong Jin

Shenzhen University

Feng Xing

Shenzhen University

Chaoyun Chen

Shenzhen University

Luping Tang

Chalmers, Architecture and Civil Engineering, Building Technology

Yanshuai Wang

Shenzhen University

Science of the Total Environment

0048-9697 (ISSN) 1879-1026 (eISSN)

Vol. 843 157004

Subject Categories

Water Engineering

Polymer Technologies

Other Chemistry Topics

DOI

10.1016/j.scitotenv.2022.157004

PubMed

35772534

More information

Latest update

7/14/2022