Effect and Mechanism of Organic Matter and Solidification Materials on Performance of Solidified Sludge Backfill Materials
SHUI Liangliang
ZHENG Xiaoguang
DAI Teng
CHEN Yajie
TAN Xuejun
Abstract：Through experiments such as unconfined compressive strength tests,phase composition and microstructure analysis,and heavy metal content determination,the effect and mechanism of organic matter content and the type of solidification materials on the performance of solidified sludge backfill materials were investigated.The results show that organic matter has a significant inhibitory effect on the solidification effects of cement and sludge solidifier.The unconfined compressive strength of sludge solidifier solidified sludge at 7 days and 28 days are 3.0-4.2 times and 3.1-4.5 times that of cement solidified sludge.Compared with the cement solidified sludge,the sludge solidifier solidified sludge generates more ettringite crystals,which compactly fill the gaps between sludge particles.Combined with the cementing effect of calcium silicate hydrate gel on sludge particles,the compactness of the solidified sludge is significantly improved,and a better stabilization effect on the heavy metals in sludge is demonstrated.The strength of the solidified sludge as a subgrade backfill material meets the requirements of the specification,and the pollution risk is low.
Keywords：water treatment sludgesolidification improvementbackfill materialsolidification mechanismroad engineering
Publication Date：2025-10-30
Online Publishing Date：2025-11-10(First online date of this platform, not the publication date of the document)
Pages：6( 1009-1014 )