Experimental study on the dynamic characteristics of dredged sludge-based foamed concrete modified with slag powder
Construction and Building Materials, cilt.537, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 537
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.conbuildmat.2026.147153
- Dergi Adı: Construction and Building Materials
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
- Anahtar Kelimeler: Cumulative plastic strain, Dredged sludge, Dynamic elastic modulus, Dynamic triaxial test, Foamed concrete
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
Dredged sludge-based foamed concrete modified with slag powder (SFC-S) is an emerging environmentally friendly composite foamed lightweight soil material derived from solid waste. SFC-S holds broad application prospects in road engineering. However, its dynamic characteristics under cyclic loading remain underexplored. In this study, the dynamic characteristics of SFC-S were investigated through dynamic triaxial tests and scanning electron microscopy (SEM) analysis under various cyclic loading conditions. The effects of density, sludge content, loading frequency, and the number of wetting-drying cycles on the evolution of dynamic elastic modulus, damping ratio, and cumulative plastic strain were analyzed experimentally. The results indicate that the dynamic elastic modulus of SFC-S ranges from 30 to 158 MPa, exhibiting a trend of initially increasing and then decreasing with increasing dynamic strain. The maximum dynamic elastic modulus is positively correlated with density and loading frequency, but negatively correlated with sludge content and the number of wetting–drying cycles. The damping ratio ranges from 0.02 to 0.16, initially decreasing and then increasing with increasing loading amplitude. It is positively correlated with sludge content and the number of wetting–drying cycles, and negatively correlated with loading frequency and density. The development of cumulative plastic strain can be divided into three stages: an initial rapid development stage, a transitional development stage, and a stable development stage. The cumulative plastic strain is positively correlated with dynamic stress amplitude, sludge content, and loading frequency, but negatively correlated with density. SEM images show that at the initial stage of cyclic loading, pores are progressively compacted, forming a large number of compacted pores. This enhances the stiffness of the specimen, increases the dynamic elastic modulus, and decreases the damping ratio. After compaction is completed, as loading continues, cracks begin to develop, leading to a decrease in the dynamic elastic modulus and an increase in the damping ratio. The microstructural analysis results are consistent with the variation trends of the macroscopic dynamic parameters. The research findings reveal the dynamic mechanical behavior of SFC-S, providing a reference for its application in subgrade engineering.