Journal of South China University of Technology(Natural Science) >

2024 , Vol. 52 >Issue 10: 87 - 100

DOI: https://doi.org/10.12141/j.issn.1000-565X.240106

Materials Science & Technology

Physical and Chemical Characteristics of Incineration Bottom Ash (IBA) from Different Sources and Strength Variability of IBA Recycled Mortar

  • CHEN Chunhong ,
  • ZHANG Haiyan ,
  • ZHANG Yonggang ,
  • TANG Ting ,
  • BU Jibin
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  • 1.State Key Laboratory of Subtropical Building and Urban Science, South China University of Technology, Guangzhou 510640, Guangdong, China
    2.School of Civil Engineering and Architecture, Guizhou Minzu University, Guiyang 550025, Guizhou, China
    3.Guangzhou Environmental Protection Investment Group Building Materials Co. , Ltd. , Guangzhou 510700, Guangdong, China
    4.School of Health Management, Guiyang Institute of Information Science and Technology, Guiyang 550025, Guizhou, China
    5.Guangzhou Pearl River Decoration Engineering Co. , Ltd. , Guangzhou 510060, Guangdong, China

Received date: 2024-03-08

  Online published: 2024-06-12

Supported by

Open Foundation of the State Key Laboratory of Subtropical Building and Urban Science(2022KB13);the University Humanities and Social Science Research Project of Guizhou Province(2024RW306);the Research and Development Project of Guangdong Provincial Department of Housing and Urban-Rural Development(2022-K2-043638)

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Abstract

Municipal solid waste incineration bottom ash (IBA) shows large heterogeneity because of different garbage composition, incineration process and storage conditions. The effective cooperation for one batch of recycled concrete (mortar) may be ineffective for another batch, resulting in large dispersion of recycled concrete (mortar) performance, which limits its application. In order to explore the heterogeneity of IBA from different sources and the strength variability of recycled mortar, this study collected a total of 14 batches of IBA samples from different incinerators and different monthly sources and tested for their physical and chemical properties. And it investigated the workability, compressive strength, and splitting tensile strength of IBA recycled mortar. Statistical analysis was conducted to assess the level of strength variability in IBA recycled mortar. The test results showed that the crushing index, porosity, sulfide, and chloride content of IBA did not meet the specifications for recycled fine aggregates, and there is significant heterogeneity in IBA from different origins. When the recycled cement mortar below M20 strength grade is prepared with a substitution rate of 50% IBA which is from a single incineration plant of different months, the strength is not significantly reduced compared with that of natural aggregate mortar, and the strength variability is similar to that of ordinary recycled aggregate concrete and the standard deviation is also lower than the recommended value of the specification. However, when used to prepare the recycled cement mortar above M20, the reduction in compressive strength was significant (reduced by 23%~32%). Due to higher compressive strength variability of IBA recycled mortars from two different incineration plants, it was not recommended to use IBA recycled mortars from different incineration plants together.

Key words： incineration bottom ash; heterogeneity; recycled mortar; strength; variability

Cite this article

CHEN Chunhong , ZHANG Haiyan , ZHANG Yonggang , TANG Ting , BU Jibin . Physical and Chemical Characteristics of Incineration Bottom Ash (IBA) from Different Sources and Strength Variability of IBA Recycled Mortar[J]. Journal of South China University of Technology(Natural Science), 2024 , 52(10) : 87 -100 . DOI: 10.12141/j.issn.1000-565X.240106

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