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采用压汞法研究了钢渣、矿渣、粉煤灰单掺或复掺对水泥硬化浆体孔结构的影响。同时还研究了掺合料单掺或复掺对水泥砂浆抗压强度的影响。结果表明:掺合料单掺或复掺对早期水泥硬化浆体的孔结构有一定的劣化作用;水化后期,矿渣与钢渣均明显降低了水泥硬化浆体的孔隙率,矿渣与粉煤灰均明显降低了水泥硬化浆体的中值孔径并改善了水泥石的孔径分布,掺合料复掺对改善水泥硬化浆体的孔结构有积极作用,尤其是掺合料三元复合可取得最佳的效果。3种掺合料降低水泥硬化浆体孔隙率能力的大小顺序为:矿渣>钢渣>粉煤灰。3种掺合料降低水泥硬化浆体孔径并改善孔径分布能力的大小顺序为:矿渣>粉煤灰>钢渣。掺合料降低了水泥砂浆早期的抗压强度,却增加了水泥砂浆90d的抗压强度。掺合料的活性大小顺序为:矿渣>钢渣>粉煤灰。
The influence of single slag or fly ash on pore structure of hardened cement paste was studied by mercury penetration method. At the same time, the effect of single or mixed admixture on the compressive strength of cement mortar was also studied. The results show that the single admixture or mixed admixture has a certain deteriorating effect on the pore structure of early hardened cement paste. In the late hydration stage, the slag and steel slag significantly reduce the porosity of the hardened cement paste. The slag and fly ash Both significantly reduce the median pore diameter of hardened cement paste and improve the pore size distribution of cement paste, admixture of admixture to improve the pore structure of cement hardened paste has a positive effect, especially admixture ternary compound available Good effect. The order of the three kinds of admixtures to reduce the porosity of cement hardened slurry is: slag> slag> fly ash. The order of the three admixtures to reduce the pore size and improve the pore size distribution of hardened cement paste is: slag> fly ash> slag. Admixture reduces the early compressive strength of cement mortar, but increased the compressive strength of cement mortar 90d. The order of activity of admixture is: slag> slag> fly ash.