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金属矿山 ›› 2021, Vol. 50 ›› Issue (07): 216-220.

• 综合利用 • 上一篇    

掺高镁镍渣的硅酸盐水泥力学性能和微观结构研究

董尧韡1  李  伟2   

  1. 1. 山西建筑职业技术学院,山西 太原 030619;2. 太原理工大学建筑与土木工程学院,山西 太原 030024
  • 出版日期:2021-07-15 发布日期:2021-08-06
  • 基金资助:
    国家自然科学基金项目(编号:51478260);山西建筑职业技术学院院级教科研项目(编号:2020XY021)

Study on Mechanical Properties and Microstructures of Portland Cement with High Magnesium Nickel Slag Addition

DONG Yaowei1    LI Wei2   

  1. 1. Shanxi College of Architectural, Taiyuan 030619, China;2. College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Online:2021-07-15 Published:2021-08-06

摘要: 为探究高镁镍渣掺量对水泥浆体凝结时间及硬化体力学性能、微观结构的影响,研究了不同配合比条件下高镁镍渣/水泥浆体凝结时间及力学性能,通过XRD、SEM分析了高镁镍渣掺量对硬化体的物相组成 、微观形貌的影响,利用比表面积分析仪分析了高镁镍渣掺量与硬化体孔结构发展的关系。结果表明:①高镁镍渣的掺入,延缓了浆体的凝结时间;在30%高镁镍渣的掺入情况下,高镁镍渣/水泥硬化体的初凝和终凝 时间分别为103 min、314 min,相比未添加高镁镍渣时分别延长了66.13%、69.73%。②随着高镁镍渣的掺入,各龄期硬化体抗压强度先增大后减小;当高镁镍渣掺量为20%时,硬化体7 d、28 d抗压强度分别为39.4 MPa、52.8 MPa,比空白组分别高出17.61%、16.82%。随着高镁镍渣的掺入,各龄期硬化体抗折强度先增大后减小;当高镁镍渣掺量为20%时,硬化体7 d、28 d抗折强度分别达到6.5 MPa、8.2 MPa,与空白组相比,分 别提高了16.07%、7.89%。③X射线衍射分析表明,高镁镍渣的掺入促进了二次水化的发生;扫描电子显微照片反映了高镁镍渣对硬化体微观结构密实化的优化作用;孔结构分析证明了高镁镍渣微颗粒的填充作用,细 化了孔隙。研究结果可为高镁镍渣在水泥中的应用提供技术支撑。

关键词: 高镁镍渣 , 凝结时间, 力学性能, 微观结构, 孔分布

Abstract: In order to explore the influence of the high magnesium nickel slag addition on the coalgulation time, hardening mechanical properties and microstructure, the coalgulation time and mechanical properties of high magnesium nickel slag/cement slurry under different mix ratio was studied. The influence of high magnesium nickel slag addition on the phase composition and microstructure of the hardened body was analyzed by XRD and SEM and the relationship between high magnesium nickel slag addition and the pore structure development of hardened body was analyzed by using specific surface area analyzer. The results showed that: ① the incorporation of high magnesium nickel slag postpones the coalgulation time of slurry. In the case of high magnesium nickel slag addition of 30%, the initial and final setting times of the hardened body of high magnesium nickel slag/cement were 103 min and 314 min, respectively, which were 66.13% and 69.73% longer than those without high magnesium nickel slag.②With the addition of high magnesium nickel slag, the compressive strength of hardened body at each age increases first and then decreases. When the contents of high magnesium nickel slag was 20%, the compressive strength of hardened body at 7 d and 28 d were 39.4 MPa and 52.8 MPa, respectively, which were 17.61% and 16.82% higher than that of blank group.With the addition of high magnesium nickel slag, the flexural strength of hardened body at each age increases first and then decreases. When the contents of high magnesium nickel slag was 20%, the flexural strength of hardened body at 7 d and 28 d reached 6.5 MPa and 8.2 MPa, respectively, which increased by 16.07% and 7.89% compared with blank group. ③X-ray diffraction analysis showed that the addition of high magnesium nickel slag promoted the occurrence of secondary hydration. Scanning electron micrograph showed that the high magnesium nickel slag could optimize the microstructure compaction of the hardened body. The pore structure analysis proves the filling effect of high magnesium nickel slag particles and refines the pores. The research results could provide technical support for the application of high magnesium nickel slag in cement.

Key words: high magnesium nickel slag, time of coagulation, mechanical properties, microstructures, pores distribution