新型双阶段膨胀封孔注浆材料研究  

Research on New Sealing Grouting Material with Two-step Expansion

作　　者：陈学习[1] 常忠乾 毕瑞卿 徐永[1] 

机构地区：[1]华北科技学院安全工程学院,河北三河065201 [2]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《金属矿山》2014年第3期44-47,共4页Metal Mine

基　　金：教育部新世纪优秀人才支持计划项目(编号:NCET-11-0837)

摘　　要：针对目前封孔注浆材料存在析水、注浆后泄漏、凝固速度慢、凝固后收缩等缺点,借鉴高水材料和加气混凝土研究成果,以硫铝水泥熟料、石膏及生石灰为主料,柠檬酸、膨润土、铝粉及多种添加剂为辅料,通过三角坐标图、正交设计等实验方法,研发出一种新型双阶段膨胀封孔注浆材料。该材料与水混合后,在初凝点和终凝点之间通过有效加气反应促使料浆体积膨胀,实现对封孔注浆段浆液漏失的补偿及对钻孔周围裂隙的封堵;并可在凝固硬化阶段再次通过钙矾石结晶微膨胀实现对微细裂隙的进一步密封压实。性能测试表明,该材料具有高水灰比(1.2∶1)、速凝、早强、膨胀性好(可达15%)、强度适中、抗渗透性好等优点,且其凝结速度能够与施工进度良好吻合,在封孔注浆领域具有较好的应用前景。A new sealing grouting material with two-step expansion is developed, considering the disadvantages of current sealing grouting material, including drainage of water, leaked after grouting slow solidification, solidification shrinkage, etc. , re- ferring to the research result of high water content and aerocrete, with sulfo-aluminate cement, gypsum, quicklime as main mate- rial and citric acid,bentonite, aluminum power, various additives as accessories, through triangular plot and orthogonal experi- mental design method. If the material is mixed with water,the effective aerated reaction taking place between the initial solidif- ying point and the end solidifying point will promote the slurry volume expansion, then it will achieve the goals that the leakage of slurry in the segment of sealing grouting must have compensation and the cracks around the borehole must have plug- ging. once again the ettringite crystallization leading to micro expansion in solidification harden stage would contribute to the further compaction sealing of micro crack. Experimental tests showed that the material has a high water-cement ratio （ 1.2：1 ）, quick-setting,early strength,excellent expansion （up 15% ）, moderate intensity, high resistance to permeability etc. , and the condensation rate can be in accordance with the construction schedule well. The material has good application prospects in the field of sealing grouting.

关 键 词：双阶段膨胀 注浆材料 配比 性能参数 

分 类 号：TD265.41[矿业工程—矿井建设]