贝利特-硫铝酸钙水泥制备及贝利特掺硼活化

发布时间：2018-02-20 22:23

本文关键词： 贝利特硫铝酸钙矿物组成硼掺杂　出处：《同济大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：采用粘土、铝矾土、碳酸钙为主要原料制备以贝利特(C2S)、硫铝酸钙(C4A3S-)和铁铝酸钙为主导矿物的水泥熟料(BCSAF),分析熟料矿物组成对水泥净浆抗压强度发展的影响,并通过硼(B)掺杂对贝利特矿物进行活化,研究其对于熟料烧成工艺及水化性能的作用机理.采用X射线衍射、扫描电子显微镜和差热-热重分析等测试方法表征熟料组成与结构.研究结果表明:C4A3S-有助于BCSAF水泥早期强度发展,而C2S主要影响BCSAF水泥的后期强度,铁铝酸钙有助于熟料烧成中的传质过程,但含量过高时,不利于获得具有较高水化活性的C2S.掺杂B可在常温下稳定α′-C2S,活化贝利特矿物,提高BCSAF水泥熟料早期水化活性,同时降低烧成反应温度,促进反应进行,减少硅铝酸钙(C2AS)过渡相的生成,而显著提高水泥3d抗压强度.
[Abstract]:Using clay, bauxite and calcium carbonate as the main raw materials, the cement clinker BCSAFN, which is mainly composed of Belite C2SU, calcium sulphoaluminate C4A3S-) and calcium aluminate ferrate, is prepared. The effect of clinker mineral composition on the development of compressive strength of cement paste is analyzed. The effects of boron B doping on clinker sintering process and hydration properties were studied. X-ray diffraction (XRD) was used to study the effect of boron B doping on clinker sintering and hydration properties. The composition and structure of clinker were characterized by scanning electron microscope (SEM) and differential thermogravimetric analysis (DTA). The results show that: C4A3S- contributes to the early strength development of BCSAF cement, while C2S mainly affects the later strength of BCSAF cement. Calcium ferrate aluminate is helpful to the mass transfer process in clinker sintering, but when the content is too high, it is unfavorable to obtain C _ 2S with high hydration activity. Doping B can stabilize 伪 -C _ 2S at room temperature, activate belite minerals, and improve the hydration activity of BCSAF cement clinker at early stage. At the same time, the reaction temperature was reduced, the reaction was promoted, the formation of transition phase was reduced, and the compressive strength of cement was improved significantly.
【作者单位】：同济大学先进土木工程材料教育部重点实验室;
【基金】：上海市国际科技合作基金项目(12230708700)
【分类号】：TQ172.1

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