硅灰对硫铝酸盐水泥水化行为的影响机理

发布时间：2018-04-29 23:14

本文选题：硫铝酸盐水泥 + 硅灰　；参考：《建筑材料学报》2017年06期

【摘要】：通过抗压强度、凝结时间、电阻率测定以及X射线衍射(XRD)、扫描电镜(SEM)和孔溶液分析,研究了掺硅灰硫铝酸盐水泥浆体的水化行为.结果表明:5%掺量(质量分数,下同)的硅灰可以很好地改善水泥浆体的抗压强度,10%硅灰掺量的试样抗压强度只在1,28d时稍高于空白试样;掺入硅灰明显缩短了硫铝酸盐水泥的凝结时间;硫铝酸盐水泥的主要晶体水化产物是钙矾石,28d时的钙矾石量稍高于3d时,掺硅灰试样的钙矾石量要高于空白试样;掺硅灰试样的电阻率变化曲线高于空白试样,表明硅灰的掺入能够加快水泥的水化速率;硬化水泥浆体的孔溶液碱度随着硅灰掺量的增加而降低,掺硅灰试样的Ca2+浓度高于空白试样,表明硅灰促进了熟料的溶解,5%硅灰掺量试样的Al 3+浓度最低,表明其促进水化的效果更明显.
[Abstract]:The hydration behavior of silicon-doped sulphoaluminate cement paste was studied by means of compressive strength, setting time, resistivity measurement, X-ray diffraction (XRD), scanning electron microscopy (SEM) and pore solution analysis. The results show that the compressive strength of the cement paste can be improved by adding 5% of silica fume (mass fraction, the same below). The compressive strength of the sample containing 10% silica fume is only slightly higher than that of the blank sample at 1 ~ 28 days. The setting time of sulphoaluminate cement was shortened obviously by adding silica fume, and the amount of ettringite was higher than that of blank sample when the amount of ettringite was slightly higher than 3 days after 28 d of ettringite. The change curve of resistivity of the silica fume sample is higher than that of the blank sample, which indicates that the addition of silica fume can accelerate the hydration rate of cement, and the alkalinity of pore solution of hardened cement paste decreases with the increase of silica fume content. The Ca2 concentration of silica fume sample was higher than that of blank sample, which indicated that silica fume promoted the dissolution of clinker with 5% silica fume and the lowest Al 3 concentration, which indicated that the effect of silica fume on hydration was more obvious.
【作者单位】：武汉科技大学城市建设学院;
【基金】：长江科学院开放研究基金资助项目(CKWV2014211/KY) 国家自然科学基金资助项目(51608402) 湖北省自然科学基金资助项目(2015CFB353)
【分类号】：TQ172.1

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