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利用钢制模具制备干粉水泥压实体,再用毛细吸水的方法成型超低水胶比硅酸盐水泥、不同细度矿粉复合硅酸盐水泥压实体样品。利用压汞测孔、背散射电子成像和小角X射线散射技术测试了水泥压实体及其水化硬化体的早龄期结构,分析了超低水胶比水泥硬化体1 d强度性能。结果表明:水泥水化早龄期硬化体内、外层水化产物的堆积密度受水泥水化前颗粒堆积结构的影响,决定水泥早龄期强度的关键因素是硬化体内层水化产物的堆积密度。在含有较多细化堆积毛细孔的细矿粉复合硅酸盐水泥压实体中,水化早龄期硬化体生成最低堆积密度的外层水化产物和最高堆积密度的内层水化产物,抗压强度最高。
The dry mold cement compacted body is prepared by using steel mold, and then the ultra-low water cementitious cement and the portland cement compacted concrete with different fineness are formed by capillary water absorption method. The age structure of cement compacts and their hydration hardened bodies was tested by mercury intrusion porosimetry, backscattered electron imaging and small-angle X-ray scattering. The 1 d strength properties of hardened cement with ultra-low water-cement ratio were analyzed. The results show that the bulk density of the hydration products in the hydration age and the hydration products in the early stage of hydration of cement is influenced by the accumulation structure of the particles before cement hydration. The key factor that determines the strength of cement in the early age is the bulk density . In the fine-grained composite portland cement compacts with more finely packed pores, the hydrated early age hardened body produces the outermost hydration product of the lowest bulk density and the innermost hydration product of the highest bulk density, Compressive strength of the highest.