含硫酸镁固废白石硫铝酸盐水泥的水化及早期力学性能

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, CERAMICS
Zengyao Wang
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引用次数: 0

摘要

研究了以金尾矿、赤泥、铝土矿、脱硫石膏和高镁石灰石为原料,生产含mga2o2的白石型硫铝酸盐水泥熟料。通过等温量热法、力学测试、x射线衍射和热分析表征了该水泥的水化和早期力学性能。结果表明,获得满意熟料强度的最佳煅烧温度为1350℃,对应的1、3、7天强度分别为27.7、45.8、54.3 MPa。水泥的初凝和终凝时间在20 ~ 31分钟之间。胶结物具有快速硬化的特点,主要水化产物为AFt、AFm和ah3。该水泥前50小时的总水化放热量仅为158 J·g -1,可有效避免水泥内部裂缝的产生,具有应用于大型混凝土工程的潜力。此外,mgal2o4矿物相在白石硫铝酸盐水泥中是惰性的,不参与水化反应,这消除了MgO在水泥体系中的缺点,并有可能增加高镁石灰石在水泥生产中的使用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
HYDRATION AND EARLY MECHANICAL PERFORMANCE OF BELITE SULFOALUMINATE CEMENT CONTAINING MgAl₂O₄ FROM SOLID WASTE
This study dealt with the use of gold tailings, red mud, bauxite, desulfurised gypsum and high magnesium limestone as the raw materials in the production of a belite sulfoaluminate cement clinker containing MgAl 2 O 4 . The hydration and early mechanical properties of this cement were characterised by isothermal calorimetry, a mechanical test, X-ray diffraction and a thermal analysis. The results showed that the optimal calcination temperature to obtain a satisfactory clinker strength was 1350 ℃ and the corresponding 1, 3 and 7-day strengths were 27.7, 45.8 and 54.3 MPa, respectively. The initial and final setting times of the cements range between 20 and 31 minutes. The cements had the characteristics of rapid hardening and the main hydration products were AFt, AFm and AH 3 . The total hydration heat release of this cement within the first 50 hours was only 158 J · g -1 , which could effectively avoid the generation of internal cracks in the cement and has the potential to be applied to large concrete projects. Furthermore, the MgAl 2 O 4 mineral phase was inert in the belite sulfoaluminate cement and did not participate in the hydration reaction, which eliminates the disadvantage of MgO in the cement systems and potentially increases the use of high magnesium limestone in cement production.
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来源期刊
Ceramics-silikaty
Ceramics-silikaty 工程技术-材料科学:硅酸盐
CiteScore
1.40
自引率
11.10%
发文量
49
审稿时长
5.5 months
期刊介绍: The journal Ceramics-Silikáty accepts papers concerned with the following ranges of material science: Chemistry and physics of ceramics and glasses Theoretical principles of their engineering including computing methods Advanced technologies in the production of starting materials, glasses and ceramics Properties and applications of modern materials Special analytical procedures Engineering ceramic including composites Glass and ceramics for electronics and optoelectronics High temperature superconducting materials Materials based on cement or other inorganic binders Materials for biological application Advanced inorganic glasses with special properties Fibrous materials Coatings and films based on inorganic non-metallic materials.
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