硫氧镁水泥复合固化剂加固淤泥质土的试验研究

doi:10.13722/j.cnki.jrme.2018.0658

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Abstract On account of the poor engineering properties of muddy soft soil with high water content，low shear strength and high content of organic matter，the laboratory studies on the properties of the organic soil solidified by the composite magnesium cement-curing agent were carried out，in which the magnesium oxysulfate cement with the good performance on energy conservation and environmental protection was chosen as the main curing agent. Firstly，the basic proportion of the soft soil solidified by the magnesium oxysulfate cement was determined through analyzing the effect of the content of organic matter and water content and dosage of magnesium oxysulfate cement on the stabilized results. Secondly，the sodium silicate，clinker，and silica fume were chosen to be the additives of the composite curing agent based on the results of double-doping experiments. Then，the central composite rotatable design(CCRD) tests with three factors and five levels were designed，in which the unconfined compressive strength of the stabilized soil at 7 d age is considered to be the evaluating criterion. Furthermore，the composite magnesium oxysulfate cement curing agent-TZ18 was developed by using the response surface methodology. Finally，through using the technology of scanning electron microscope the microstructure of the TZ18 stabilized soil was analyzed by comparison with the Portland cement and magnesium oxysulfate cement stabilized soil. It was found that at the same age，TZ18 stabilized produced more hydration products，had stronger bonds between the particles and more stable micro-structural characteristics than the other two kinds of stabilized soil.

Key words： soil mechanics muddy soil organic matte magnesium oxysulfate cement curing agent unconfined compressive strength response surface methodology

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	ZHU Jianfeng
	RAO Chunyi
	TUO Qiushui
	LIU Haoxu
	PAN Binjie

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ZHU Jianfeng,RAO Chunyi,TUO Qiushui, et al. Experimental study on the properties of the organic soil solidified by the composite magnesium oxysulfate cement-curing agent[J]. , 2019, 38(S1): 3206-3214.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0658 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/3206

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