【摘要】 为了缓解碱矿渣水泥收缩较大和抗裂性能较差的问题，以矿渣及粉状炉渣为前驱体，采用碳酸钾及硅酸钠为复合激发剂，研究不同碳酸钾掺量(0%～2%)对碱激发矿渣-粉状炉渣水泥砂浆(ASPm)自收缩及基本拉伸徐变的影响，并通过XRD、TG/DTG、SEM-EDS、MIP(压汞)及NMR揭示其机理。结果表明：随着碳酸钾掺量提高，水化程度降低，化学收缩减小，毛细孔压力降低，C-A-S-H凝胶生成量减少，碳酸钙晶体生成量增加，名义晶胶比增大，n(Al)/n(Si)下降，C-A-S-H凝胶的堆叠明显，重组重排受限，ASPm自收缩减小。当碳酸钾掺量从0%增加至1.5%时，自收缩减小，n(K)/n(Na)提高，C-A-S-H凝胶生成量下降，此时开裂时间延长和C-A-S-H凝胶层间摩擦降低起主导作用，ASPm开裂时的基本拉伸徐变增大。当碳酸钾掺量从1.5%增加至2%时，n(K)/n(Na)提高，开裂时间不变，此时自收缩减小起主导作用，ASPm开裂时的基本拉伸徐变减小。碳酸钾掺量为1.5%时，ASPm具有较好的力学性能、较小的自收缩、最好的抗裂性能和最大的基本拉伸徐变。更多还原

【Abstract】 In order to relieve the significant shrinkage and poor crack resistance of alkali-activated slag cement, with the blast furnace slag and powdered municipal solid waste incineration slag as precursors and the potassium carbonate and sodium silicate as composite activators, alkali-activated blast furnace slag-powdered municipal solid waste incineration slag mortar(ASPm) was prepared, and the effect of potassium carbo-nate content(from 0% to 2%) on the autogenous shrinkage and basic tensile creep of ASPm was studied, and its mechanism was revealed by TG/DTG, SEM-EDS, MIP, and NMR. The results show that, with the increase of potassium carbonate content, the hydration degree decreases, the chemical shrinkage decreases, the capillary pressure decreases, the amount of C-A-S-H gel decreases, the amount of calcium carbo-nate crystal increases, the nominal crystal-gel ratio increases, the n(Al)/n(Si) decreases, the stacking of C-A-S-H gel is obvious, the recombination and rearrangement are restricted, and the autogenous shrinkage of ASPm decreases. When the content of potassium carbonate increases from 0% to 1.5%, the autogenous shrinkage decreases, the n(K)/n(Na) ratio increases, the amount of C-A-S-H gel declines. At this stage, the prolonged cracking time and the decreased interlayer friction of C-A-S-H gel play a leading role, and the basic tensile creep at the cracking time of ASPm increases. When the content of potassium carbonate increases from 1.5% to 2%, the n(K)/n(Na) ratio increases, and the crac-king time remains unchanged. At this stage, the reduction of autogenous shrinkage plays a dominant role, and the basic tensile creep at the cracking time of ASPm decreases. When the potassium carbonate content is 1.5%, ASPm has better mechanical properties, smaller autogenous shrinkage, the best crack resistance, and maximum basic tensile creep.更多还原