狄红丰, 张海波, 侯成岩等.应力预养护对硫铝酸盐注浆材料强度与微结构的影响[J].河南理工大学学报（自然科学版）,2021,40(3):163-168.

DI H F, ZHANG H B, HOU C Y, et al.Effect of pre-curing stress on strength and micro structure of sulphoaluminategrouting materials[J].Journal of Henan Polytechnic University(Natural Science) ,2021,40(3):163-168.

应力预养护对硫铝酸盐注浆材料强度与微结构的影响

狄红丰1, 张海波1,2, 侯成岩1, 郑冬冬1, 柴虎成1, 刘浪1, 管学茂1,2

1.河南理工大学 材料科学与工程学院，河南 焦作 454000;2.河南省深地材料科学与技术重点实验室，河南 焦作 454000

摘要:在煤矿千米深井巷道注浆加固示范工程中，注浆结石体抗压强度常高于常压下的抗压强度，针对此问题，采用自制加压装置模拟应力作用对注浆材料浆液进行加压预养护，通过测试试样强度、表观密度、孔隙率、水化产物种类和微观结构，分析应力对材料强度增强的作用机理。结果表明：10 MPa的应力可以显著提高注浆材料结石体的抗折、抗压强度，抗折强度最大增加24.3%，抗压强度最大提高21.6% ；应力可促进早期钙矶石的生成且不改变水化产物种类，提高结石体密度。分析认为，应力通过促进钙矾石的生成速率，降低结石体孔隙率和最可几孔径的方式提高结石体的强度，即提高结石体的密度，增加钙矾石相互搭接的紧密程度，进而提高注浆材料结石体的抗折、抗压强度。检测结石体密度在某种意义上可以评估注浆加固的加固效果。

关键词:硫铝酸盐;注浆材料;应力模拟装置;微结构;强度增强机理

doi:10.16186/j.cnki.1673-9787.2019120053

基金项目:国家重点研发计划项目（2017YFC0603004）；河南省自然科学基金资助项目（182300410207）

收稿日期:2019/12/19

修回日期:2020/06/10

出版日期:2021/05/15

Effect of pre-curing stress on strength and micro structure of sulphoaluminategrouting materials

DI Hongfeng1, ZHANG Haibo1,2, HOU Chengyan1, ZHENG Dongdong1, CHAI Hucheng1, LIU Lang1, GUAN Xuemao1,2

1.School of Materials Science and Engineering， Henan Polytechnic University ，Jiaozuo  454000 ， Henan， China;2.Henan Key Laboratory of Materials on Deep-Earth Engineering， fiao^^o  454000 ， Henan， China

Abstract:In the demonstration project of grouting reinforcement of coal mine roadways at 1 000 m deep and above， it was found that the strength of the grouting stone is higher than that under normal pressure. In order to solve this problem， a self-made pressure device was used to simulate the in-situ stress to pre-cure grouting material slurry. By testing the strength ， apparent density ， porosity ， hydration product type and microstructure of the sample， the mechanism of stress enhancement of the material was explained. The results showed the stress of 10 MPa could significantly increase the flexural and compressive strength of the grouting material stone body. The maximum flexural strength increased by 24. 3 % and the maximum compressive by 21.6% . Stress could promote the formation of early ettringite without changing the type of hydration products and increase the density of stones. The analysis suggested stress could increase the strength of the stone body by promoting the formation rate of ettringite， reducing the porosity of the stone body and the most pore size， that was， increasing the density of the stone body， and increasing the closeness of the ettringite overlap. Grouting reinforcement is a concealed project. Detecting the density of stones could evaluate the reinforcement effect of grouting reinforcement in a certain sense.

Key words:sulphoaluminate;grouting material;stress simulation device;microstructure;strength enhancement mechanism

应力预养护对硫铝酸盐注浆材料强度与微结构的影响_狄红丰.pdf