赤泥对道路硅酸盐水泥性能和矿物组成的影响

发布时间：2018-04-13 04:29

本文选题：赤泥 + 水泥煅烧　；参考：《建筑材料学报》2017年05期

【摘要】：以赤泥、砂岩和石灰石为原料进行赤泥道路硅酸盐水泥的制备研究.分析了赤泥的掺加对道路硅酸盐水泥矿物组成和基本性能的影响.结果表明:以赤泥为部分原料可以成功制备以C_3S,C_2S和C_4AF为主要矿物相的道路硅酸盐水泥熟料;赤泥道路硅酸盐水泥熟料掺加5%(质量分数)的二水石膏可以制备出各项性能优异的赤泥道路硅酸盐水泥;与普通道路硅酸盐水泥相比,赤泥道路硅酸盐水泥的早期抗压强度偏低;虽然预先对赤泥进行了脱碱处理(脱碱后赤泥中总碱含量(质量分数)1%),但当其掺量(质量分数)超过26%时,赤泥道路硅酸盐水泥熟料中的碱仍会对水泥矿物的形成产生不利影响;赤泥道路硅酸盐水泥熟料中的碱大部分以硫酸钾(钠)的形式存在于水泥熟料的中间相中;随着赤泥道路硅酸盐水泥水化龄期的延长,放射性核素~(226)Ra的放射性比活度不断升高,~(232)Th变化不大,~(40)K则不断降低;赤泥道路硅酸盐水泥的外照指数为0.87,对环境的放射性影响处在安全范围内.
[Abstract]:Using red mud, sandstone and limestone as raw materials, the preparation of red mud road Portland cement was studied.The effects of red mud admixture on mineral composition and basic properties of road Portland cement were analyzed.The results show that the road Portland cement clinker with C3S- C2S and C_4AF as the main mineral phase can be successfully prepared by using red mud as part of raw material.Red mud road Portland cement clinker mixed with 5% (mass fraction) of gypsum dihydrate can be used to produce all kinds of excellent red mud road Portland cement.The early compressive strength of red mud road Portland cement is on the low side; although the red mud has been pre-treated with desalination (total alkali content (mass fraction) of red mud after desalination), when the amount of red mud (mass fraction) is more than 26%,The alkali in red mud road Portland cement clinker will still have a negative effect on the formation of cement minerals, and most of the alkali in red mud road Portland cement clinker exists in the form of potassium sulfate (sodium) in the intermediate phase of cement clinker.With the prolongation of hydration age of Portland cement in red mud road, the specific activity of radionuclide Th 226Ra increases continuously, and the change of Th is not so great that 40K decreases.The external radiation index of Portland cement in red mud road is 0.87, and the environmental radioactivity is in the safe range.
【作者单位】：华北水利水电大学土木与交通学院;天津城建大学材料科学与工程学院;郑州大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51172155)
【分类号】：TQ172.1

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