活性矿物掺合料对膨胀稳定性注浆材料性能的影响  

Effect of Active Mineral Admixture on the Properties of Expansive Stable Grout Material

作　　者：林荣峰 付鹏 陈璐 张耀磊 杜帅 王志鑫 LIN Rongfeng;FU Peng;CHEN Lu;ZHANG Yaolei;DU Shuai;WANG Zhixin(College of Civil Engineering and Architecture,Shandong University of Aeronautics,Binzhou 256600,China;Shangdong Huadi Construction Technology Co.Ltd.,Jinan 251400,China;National Key Laboratory of Disaster Prevention and Control and Intelligent Construction and Maintenance of Tunnel Engineering,Jinan 250061,China)

机构地区：[1]山东航空学院建筑工程学院,山东滨州256600 [2]山东华迪建筑科技有限公司,山东济南251400 [3]隧道工程灾变防控与智能建养全国重点实验室,山东济南250061

出　　处：《金属矿山》2024年第12期301-306,共6页Metal Mine

基　　金：山东省自然科学基金青年项目(编号:ZR2022QE153)。

摘　　要：针对高水灰比普通水泥注浆材料存在析水率高和结石体体积收缩等问题,以自制膨胀稳定性水泥注浆材料为研究对象,研究不同掺量的活性矿物掺合料对注浆材料流动性、凝结时间、抗压强度及自由膨胀率等的影响,并利用XRD对不同龄期内的结石体水化产物进行分析。试验结果表明:活性矿物掺合料的掺入增大了浆液的析水率和流动度,且延长了浆液的凝结时间,有利于提高浆液在被注介质中的可注性;当活性矿物掺合料掺量为15%时,结石体抗压强度最高,63 d结石体的抗压强度达到15.2 MPa;浆液结石体自由膨胀率受活性矿物掺合料的影响较小;在硫酸钠溶液中养护的活性矿物掺合料的结石体28 d抗折强度对比水中养护提高了3.2%~44.4%;活性矿物掺合料对浆液结石体性能的影响主要体现在钙矾石和氢化钙等水化产物的生成量;研究成果可为稳定性水泥基注浆材料的配制及选型提供科学指导。Aiming at the problems of high water-cement ratio of ordinary cement grouting materials,such as high water precipitation rate and volume shrinkage of consolidation body,the self-made expansive stable cement grouting material was used as the research object,the effects of active mineral admixtures(AMA)with different amounts on the fluidity,setting time,compressive strength and free expansion rate of the grouting materials were studied.The hydration products of consolidation body in different curing ages were analyzed by XRD.The test results show that the addition of AMA increases the water extraction rate and fluidity of the grout,and prolongs the setting time of the grout,which is conducive to improving the grouting ability of the grout in the injected medium.When the AMA content is 15%,the compressive strength of consolidation body is the highest,and the compressive strength of the 63 d consolidation body is 15.2 MPa.The free expansion rate of consolidation body is less affected by the addition of AMA.The 28 d bending strength of consolidation body mixed with AMA is increased by 3.2%~44.4%in sodium sulfate solution compared with that in water.The effect of AMA on the properties of consolidation body is mainly reflected in the amount of hydration products such as ettringite and calcium hydroxide.The research results can provide scientific guidance for the preparation and selection of stable cement-based grouting materials.

关 键 词：膨胀稳定性浆液 活性矿物掺合料 物理力学性能 体积稳定性 水化产物 

分 类 号：TD745[矿业工程—矿井通风与安全]