A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Strength and microstructural characteristics of cement-solidified salt-rich dredged silt modified by nanoparticles
Chemical solidification based on cement is one of the most widely used methods to treat marine dredged silt (DS) with very poor engineering properties. This study investigated the strength and microstructure of cement-solidified salt-rich dredged silt (CSDS) modified by nanoparticles. The unconfined compressive strength (UCS) test showed that the UCS of CSDS containing 9% NaCl was obviously lower than that without NaCl. Furthermore, the detrimental effect of chloride salt on the UCS increased with its content significantly. The nano-SiO2 (NS) used as cement additives can significantly improve the UCS of CSDS and adding 8% NS can reduce cement usage by at least 40%. Compared with NS, the nano-MgO (NM) mainly improved the early UCS of CSDS within 7 days. The needle-like Friedel’s salt (the reaction product of chloridion with cement) and lamellar brucite (expansive mineral) were clearly detected by the X-ray diffraction test. The calcium silicate hydrate and magnesium silicate hydrate mainly contributed to construct the skeleton, which was confirmed by the scanning electron microscopy images. The NS and NM with high reactivity can be used as effective cement additives to overcome the negative effect of chloride salt, so as to increase the strength of CSDS.
Strength and microstructural characteristics of cement-solidified salt-rich dredged silt modified by nanoparticles
Chemical solidification based on cement is one of the most widely used methods to treat marine dredged silt (DS) with very poor engineering properties. This study investigated the strength and microstructure of cement-solidified salt-rich dredged silt (CSDS) modified by nanoparticles. The unconfined compressive strength (UCS) test showed that the UCS of CSDS containing 9% NaCl was obviously lower than that without NaCl. Furthermore, the detrimental effect of chloride salt on the UCS increased with its content significantly. The nano-SiO2 (NS) used as cement additives can significantly improve the UCS of CSDS and adding 8% NS can reduce cement usage by at least 40%. Compared with NS, the nano-MgO (NM) mainly improved the early UCS of CSDS within 7 days. The needle-like Friedel’s salt (the reaction product of chloridion with cement) and lamellar brucite (expansive mineral) were clearly detected by the X-ray diffraction test. The calcium silicate hydrate and magnesium silicate hydrate mainly contributed to construct the skeleton, which was confirmed by the scanning electron microscopy images. The NS and NM with high reactivity can be used as effective cement additives to overcome the negative effect of chloride salt, so as to increase the strength of CSDS.
Strength and microstructural characteristics of cement-solidified salt-rich dredged silt modified by nanoparticles
Wang, Shiquan (author) / Lang, Lei (author) / Wei, MingLi (author) / He, Xingxing (author) / Wang, Rui (author) / Yu, Chen (author) / Feng, Songbao (author) / Niu, Zhiyong (author) / Ma, Hongrui (author)
Marine Georesources & Geotechnology ; 40 ; 983-994
2022-07-27
12 pages
Article (Journal)
Electronic Resource
Unknown
Strength and consolidation characteristics of underwater vacuum consolidated dredged silt
| British Library Conference Proceedings | 2002
Strength Properties of Cement-Solidified Dredged Sludge Affected by Curing Temperature
| DOAJ | 2022
Formula and preparation method of polymer composite flow type dredged silt solidified soil
| European Patent Office | 2021
Influence Mechanism of Fulvic Acid on the Strength of Cement-Solidified Dredged Sludge
| DOAJ | 2022