自燃煤矸石基地质聚合物低强度注浆材料的制备及其微观分析  

Preparation and Microanalysis of Geopolymer Low-Strength Grouting Material Based on Self-Combusting Gangue

作　　者：吴求刚 赵恒 刘威 王新富[1,2] 王彦君 何建国 章梅 朱孛 WU Qiugang;ZHAO Heng;LIU Wei;WANG Xinfu;WANG Yanjun;HE Jianguo;ZHANG Mei;ZHU Bei(Jiangsu Design Institute of Geology for Mineral Resources(Testing Center of China National Administration of Coal Geology),Xuzhou 221006,China;Key Laboratory of Coal Resources and Mineral Resources,China National Administration of Coal Geology,Xuzhou 221006,China)

机构地区：[1]江苏地质矿产设计研究院(中国煤炭地质总局检测中心),徐州221006 [2]中国煤炭地质总局煤系矿产资源重点实验室,徐州221006

出　　处：《硅酸盐通报》2024年第7期2539-2547,共9页Bulletin of the Chinese Ceramic Society

基　　金：徐州市科技创新重点研发计划(社会发展)项目(KC23325);中国煤炭地质总局重大科技专项(揭榜挂帅)项目(ZMKJ-2023-JBGS-02-02);中能化江苏地质矿产设计研究院有限公司科技创新基金(ZNH-2022-B)。

摘　　要：以自燃煤矸石为原料,粉煤灰和低掺量复合硅酸盐水泥P·C 42.5为辅料,通过电石渣的激发作用制备了自燃煤矸石基地质聚合物低强度注浆材料并对其进行了微观分析。结果表明:在电石渣掺量(9.65%,质量分数)相同时,煤矸石、粉煤灰和水泥质量比设置为5∶3∶2或5∶2∶3时更有利于样品抗压强度发展,较质量比为7∶2∶1和7∶1∶2的样品,其样品体系地质聚合反应程度更高且55 d抗压强度可增加70%~86%;同时,与未添加脱硫石膏样品相比,添加20%(质量分数)脱硫石膏可以大幅提升样品养护全过程的抗压强度,55 d抗压强度可增加21%~50%;相关性、XRD、SEM及FTIR分析表明,样品主要水化产物为钙矾石、水化硅酸钙(C-S-H)凝胶体、水化硅铝酸钙(C-A-S-H)无定形凝胶体等,且样品抗压强度主要来源于地质聚合反应产生的C-A-S-H无定形凝胶体。With self-combusting gangue as raw material,fly ash and low dosage of composite Portland cement P·C 42.5 as supplementary materials,geopolymer low-strength grouting materials based on self-combusting gangue were prepared by the excitation of calcium carbide slag,and the samples were microscopically analyzed.The experimental results show that when the amount of calcium carbide slag mixing(9.65%,mass fraction)is the same,the compressive strength development of samples is more favorable when the mass ratio of gangue,fly ash and cement is set to 5∶3∶2 or 5∶2∶3,the geopolymerization of the sample system is higher and the compressive strength(55 d)increases by 70%~86%compared to the samples with mass ratio of 7∶2∶1 and 7∶1∶2.At the same time,compared with the samples without adding desulfurization gypsum,adding 20%(mass fraction)desulfurization gypsum greatly improves the compressive strength of samples during the whole process of curing,and the compressive strength(55 d)increases by 21%~50%.The combination of correlation,XRD,SEM and FTIR analyses indicate that the main hydration products of samples are ettringite,C-S-H gel,C-A-S-H amorphous gel and others,and the compressive strength of samples is mainly derived from the C-A-S-H amorphous gels produced by geopolymerization.

关 键 词：自燃煤矸石 地质聚合物 注浆材料 水化硅铝酸钙 电石渣 微观分析 

分 类 号：TU528.01[建筑科学—建筑技术科学]