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OA北大核心CSTPCD

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.