超低水胶比水泥硬化体的早龄期显微结构与强度

发布时间：2018-01-24 08:07

本文关键词： 毛细吸水水泥硬化体微结构强度堆积密度　出处：《硅酸盐学报》2017年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The dry powder cement compacted entity was prepared by steel mould, and then the ultra-low water binder ratio Portland cement was molded by capillary absorption method, and the compacted solid sample of different fineness mineral powder composite Portland cement was prepared. The pore was measured by mercury injection. Back scattering electron imaging and small angle X-ray scattering technique were used to measure the early age structure of cement compacted solid and its hydrated hardening body. The results show that the packing density of the outer hydration product is affected by the particle stacking structure before hydration of cement. The key factor to determine the early age strength of cement is the accumulation density of hydration products. The hydration products of the outer layer with the lowest packing density and the inner hydration product of the highest packing density are produced by the early hydration hardening body, and the compressive strength is the highest.
【作者单位】：安徽师范大学化学与材料科学学院功能分子固体教育部重点实验室安徽分子基材料省级实验室;
【基金】：国家重点基础研究发展计划(2009CB623105)资助
【分类号】：TQ172.1
【正文快照】： 对于多组分、多层次复杂结构的水泥基材料,构建结构与性能关系的科学模型艰巨而紧迫。20世纪40年代,Powers等[1 2]提出的水泥浆体胶空比模型是水泥基材料从经验走向科学的典范,指导了水泥基材料低水胶比生产应用。利用高性能减水剂能够获取超低水胶比的水泥基材料[3 4],但高

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