Experimental Study on Sludge Solidification by Multi-Source Solid Waste

DOI

10.2991/978-94-6463-728-1_57How to use a DOI?

Keywords

Sludge solidification; Alkali-activated cementitious materials; Solid waste

Abstract

Cement solidification is one of the most widely used methods of sludge improvement, but the cement production process generates high CO₂ emissions, thus a low-carbon curing agent is required. The purpose of this research is to explore the feasibility of sludge solidification by cementitious materials composed of multi-source solid waste, including calcium carbide slag (CCR), ground granulated blast slag (GGBS) and uncalcined completely decomposed granite (CDG). The effect of curing age, composition of precursor, CCR content, CDG particle gradation, initial moisture content of sludge on the unconfined compressive strength (UCS) was investigated by a series of tests. Mercury intrusion experiment (MIP), scanning electron microscopy (SEM) and X-ray diffraction analyses (XRD) were performed to gain additional insight into the mechanism of strength development. The experiment results indicate that, under the admixture proportion of GGBS to CDG in 3:1, the 28-day UCS of solidified sludge by multi-source solid waste is close to that of cement. An increasing CCR content will inhabit the formation of short-term UCS while promote the acquisition of long-term strength. The results also show that the incorporation of fine grains and gravel of CDG is beneficial in the short-term and long-term UCS respectively. In addition, the microstructural analysis verified the formation of hydration products leading to a less-porous and denser inter-structure. Consequently, it was confirmed that cementitious materials composed of multi-source solid waste can be a sustainable and effective curing agent as a substitute for cement.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Fubin Yin
AU  - Lingshuai Zhang
AU  - Pei Tai
PY  - 2025
DA  - 2025/05/19
TI  - Experimental Study on Sludge Solidification by Multi-Source Solid Waste
BT  - Proceedings of the 3rd International Conference on Green Building, Civil Engineering and Smart City (GBCESC 2024)
PB  - Atlantis Press
SP  - 599
EP  - 609
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-728-1_57
DO  - 10.2991/978-94-6463-728-1_57
ID  - Yin2025
ER  -