纳米碳酸钙改性超细水泥注浆材料研究  

Study on Superfine Cement Grouting Material Modified by Nanometer Calcium Carbonate

作　　者：樊震旺 张雷 陈朋成 张帅[1] 李彦志[1] FAN Zhenwang;ZHANG Lei;CHEN Pengcheng;ZHANG Shuai;LI Yanzhi(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;The 32378 Troops of the Chinese People’s Liberation Army,Beijing 100072,China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛市266590 [2]中国人民解放军32378部队,北京100072

出　　处：《矿业研究与开发》2020年第5期75-79,共5页Mining Research and Development

基　　金：国家自然科学基金资助项目(51774192);国家自然科学基金资助项目(51474135).

摘　　要：研制了一种低粘度超细水泥复合浆液,以满足深井井筒微裂隙注浆堵水的要求。以超细水泥,纳米碳酸钙,减水剂和超细粉煤灰为试验材料,采取正交试验,研究了在不同水灰比,纳米碳酸钙掺量,减水剂和超细粉煤灰掺量的条件下,浆液的黏度、析水率、凝结时间和结石体抗压强度的变化规律。结果表明:随着水灰比增大、超细粉煤灰和减水剂掺量增加,黏度降低;随着纳米碳酸钙掺量增加,黏度先降低后小幅度升高;随着水灰比增大、超细粉煤灰和减水剂掺量增加,析水率有不同程度的增加;随着纳米碳酸钙掺量增加,析水率先增大后减小;随着纳米碳酸钙掺量增加,初凝和终凝时间都是先增大后减小,随着水灰比增大、超细粉煤灰和减水剂掺量增加,初凝和终凝时间都有不同程度的增大;水灰比增大,结石体28d抗压强度减小,随着纳米碳酸钙掺量增加,结石体28d抗压强度先增大后减小,超细粉煤灰掺量增加使28d抗压强度略有减小,减水剂对28d抗压强度影响很小,可忽略不计。A low viscosity superfine cement composite slurry was developed to meet the requirement of water shutoff by grouting in micro-cracks in deep wellbore of kilometers.Taking superfine cement,nanometer calcium carbonate,water reducing agent and superfine fly ash as experimental materials,orthogonal experiments were carried out to study the variation of slurry viscosity,water condensation rate,setting time and compressive strength of stone body under different water-cement ratio,nanometer calcium carbonate content,water reducing agent and superfine fly ash content.The results showed that the viscosity decreased with the increase of water-cement ratio,superfine fly ash and water reducing agent content,but decreased first and then increased slightly with the increase of nanometer calcium carbonate content.The water condensation rate increased to some extent with the increase of water-cement ratio,superfine fly ash and water reducing agent content,but increased first and then decreased with the increase of nanometer calcium carbonate content.The initial setting time and final setting time increased first and then decreased with the increase of nanometer calcium carbonate content,but increased in different degrees with the increase of water-cement ratio,superfine fly ash and water reducing agent content.The compressive strength of stone body in28 day decreased with the increase of water-cement ratio,increased first and then decreased with the increase of nanometer calcium carbonate content,and decreased slightly with increase of superfine fly ash content.The effect of water reducing agent on the compressive strength was little,which could be negligible.

关 键 词：超细水泥浆液 超细粉煤灰 纳米碳酸钙 微裂隙 黏度 正交试验 

分 类 号：TD823[矿业工程—煤矿开采] TD265.4[矿业工程—矿山开采]