摘要
针对淤泥质土壤的资源化利用需求,本文系统研究了非晶态C_(12)A_(7)/石膏二元体系对高含水率淤泥土力学性能、水稳性及微观结构的影响。采用非晶态C_(12)A_(7)/石膏二元体系与水泥复配制备固化剂改良高含水率淤泥,通过宏观实验(无侧限抗压强度和水稳性测试)和微观分析(XRD、SEM),揭示了淤泥快速固化机理。结果表明,随着非晶态C_(12)A_(7)/石膏二元体系掺量的提高,淤泥土(含水率50%)的无侧限抗压强度和水稳系数显著提高。掺量为12%时,2h和28d无侧限抗压强度分别达到2.3 MPa和8.7 MPa,28d水稳系数达到0.99。非晶态C_(12)A_(7)/石膏二元体系与水泥的协同水化作用赋予固化土优异的早期和后期力学性能,高含水淤泥土硬化体中水化产物主要为Aft、C-S-H凝胶和Ca(OH)_(2)等产物,细小的泥土颗粒填充与产物之间形成密实的网状结构进一步提高硬化体的无侧限抗压强度。
In response to the resource utilization needs of silty soil,this paper systematically studies the influence of amorphous C_(12)A_(7)/gypsum binary system on the mechanical properties,water stability and microstructure of high-water content silt soil.The curing agent was prepared by amorphous C_(12)A_(7)/gypsum binary system and cement compound to modified the silt soil.Through macroscopic experiments(compressive strength and water stability test)and microscopic analysis(XRD,SEM),the rapid curing mechanism of sludge was revealed.The results show that with the increase of the binary system,the lateral compressive strength and water stability coefficient of the silt soil(water content 50%)have been significantly improved.When the doping amount is 12%,the compressive strengths of 2 h and 28 d reached 2.3 MPa and 8.7 MPa,respectively,and the water stability coefficient of 28d reached 0.99.The coordination effect of the binary system and cement promotes excellently early and late mechanical properties of the cured soil.The hydration products in the pastes are mainly AFt,C-S-H gel,Ca(OH)_(2) and other products.The compact structure is formed between the filling of fine soil particles and products,which further improves the compressive strength.
作者
张江涛
马凯
范德科
庚利民
吕明超
马铖
瞿海洋
武斌
李伟华
董臣雄
ZHANG Jiangtao;MA Kai;FAN Deke;GENG Limin;LV Mingchao;MA Cheng;QU Haiyang;WU Bin;LI Weihua;DONG Chenxiong(China Building Materials Academy Co.,Ltd.,CNBM Zhongyan Technology Co.,Ltd.,Beijing 100024)
出处
《中国建材科技》
2025年第S1期38-41,46,共5页
China Building Materials Science & Technology
基金
国家自然科学基金青年基金项目(编号:52402038)。
