A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Characterization and mechanism analysis of polynaphthalene sulfonate modified cemented soil
Highlights Polynaphthalene sulfonate (NS) improves UCS and compactibility of cemented soil. High-dose NS decreases the chemical volume shrinkage of cemented soil. NS adsorption hinders the aggregation of soil minerals. NS reduces the water combination of soil minerals to improve cement hydration. NS adsorbs preferentially onto soil minerals with alumina-silica structures.
Abstract Adding polyelectrolyte to modify engineering properties of cemented soil has been tested in some studies, but its effects are controversial and the modification mechanisms need to be further investigated. This study aimed to examine the modification effects of a macromolecular polyelectrolyte, i.e. polynaphthalene sulfonate (NS) for the macro- and micro-characteristics of cemented soil, and NS dose of 0.6–1.8% of cement mass was employed. The macro-characteristics involved compactibility, unconfined compressive strength (UCS) and volume deformation produced by chemical reaction (shortened as chemical deformation). The micro-characteristics involved compounds evolution, micro-morphology and surface chemical activity tested by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), total organic carbon (TOC) and X-ray photoelectron spectroscopy (XPS). This study found that 1.2% NS addition improved compactibility, UCS and chemical shrinkage of cemented soil, for that the adsorbed NS reduced aggregation and water combination of soil minerals and increased water consumption for cement hydration. However, an overdose NS reduced the improvements due to the thickened NS adsorption layer and redundantly adsorbed NS molecules on cement. This study concluded that a substantially preferential adsorption of NS on soil minerals compared to cement was the fundamental mechanism of improvement effects.
Characterization and mechanism analysis of polynaphthalene sulfonate modified cemented soil
Highlights Polynaphthalene sulfonate (NS) improves UCS and compactibility of cemented soil. High-dose NS decreases the chemical volume shrinkage of cemented soil. NS adsorption hinders the aggregation of soil minerals. NS reduces the water combination of soil minerals to improve cement hydration. NS adsorbs preferentially onto soil minerals with alumina-silica structures.
Abstract Adding polyelectrolyte to modify engineering properties of cemented soil has been tested in some studies, but its effects are controversial and the modification mechanisms need to be further investigated. This study aimed to examine the modification effects of a macromolecular polyelectrolyte, i.e. polynaphthalene sulfonate (NS) for the macro- and micro-characteristics of cemented soil, and NS dose of 0.6–1.8% of cement mass was employed. The macro-characteristics involved compactibility, unconfined compressive strength (UCS) and volume deformation produced by chemical reaction (shortened as chemical deformation). The micro-characteristics involved compounds evolution, micro-morphology and surface chemical activity tested by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), total organic carbon (TOC) and X-ray photoelectron spectroscopy (XPS). This study found that 1.2% NS addition improved compactibility, UCS and chemical shrinkage of cemented soil, for that the adsorbed NS reduced aggregation and water combination of soil minerals and increased water consumption for cement hydration. However, an overdose NS reduced the improvements due to the thickened NS adsorption layer and redundantly adsorbed NS molecules on cement. This study concluded that a substantially preferential adsorption of NS on soil minerals compared to cement was the fundamental mechanism of improvement effects.
Characterization and mechanism analysis of polynaphthalene sulfonate modified cemented soil
Xu, Fei (author) / Cai, Yuebo (author) / Qian, Wenxun (author) / Wei, Hua (author) / Zhuang, Huaxia (author) / He, Yang (author)
2019-12-20
Article (Journal)
Electronic Resource
English
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