MgO/硅酸钠复合对碱矿渣水化和力学特性的影响
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安徽理工大学

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TU528????????????????????????

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国家自然科学基金青年科学基金(52008003),芜湖市科技计划项目(ALW2020YF16),安徽省住房城乡建设科学技术计划项目(2020-YF12),安徽省高等学校自然科学研究重大项目(KJ2020ZD33)


Effect of MgO/ Sodium Silicate Composite Activator on the Hydration and Mechanical Properties of Alkali-Activated Slag Materials
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Anhui University of Science and Technology

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the National Natural Science Foundation of China Youth Science Foundation(52008003), Science and Technology Plan Project of Wuhu(ALW2020YF16), Housing and Rural Construction Science and Technology Plan Project of Anhui(2020-YF12), Major Projects in Natural Science Research of Anhui University of Higher Education(KJ2020ZD33)

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    摘要:

    为促进MgO基单组份AASM的发展和应用,本文采用MgO和硅酸钠为激发剂,通过单独及复合激发的方式,研究了MgO和硅酸钠组合形式对单组份碱矿渣胶凝材料水化微结构和力学特性的影响,并采用纳米压痕分析了其微观力学性能。研究结果表明:MgO加入时,形成Mg(OH)2提供碱性环境,促使矿渣溶解,硅酸钠溶解后,进一步提升溶液pH值,加速矿渣Al-O、Si-O断裂,Ca2+等溶出,形成双重强化效应,促进矿渣水化;MgO、硅酸钠复合激发时产生了相对单独激发更丰富的水化产物;孔结构分析发现复合激发时胶凝材料具有最小的孔隙率,且有害孔隙最少;两者复合激发时会产生更多的高弹性模量水化产物,而较强的微观力学性能则促使宏观力学强度的提高。

    Abstract:

    To promote the development and application of MgO-based one-part alkali-activated slag materials (AASM), MgO and sodium silicate were used as activators by the ways of single or combined to study their effects on hydration microstructure and mechanical properties of one-part AASM. Moreover, micro-mechanical properties were also analyzed by nanoindentation. Results showed that the formation of Mg(OH)2 after MgO contacted with water provided an alkaline environment, which induced the dissolution of slag. While the dissolution of sodium silicate further elevated the solution pH and accelerated the fracture of Al-O and Si-O chemical bond as well as the released of Ca2+. This formed a double strengthening effect to promote the hydration of slag. In addition, the composite activator of MgO and sodium silicate produced more abundant hydration products. Pore structure analysis revealed that AASM had the lowest porosity and the least harmful pores by using the combined MgO and sodium silicate to activate slag. More hydration products with high elastic modulus were produced in combination with MgO and sodium silicate, thus contributing to the increase in micro-mechanical properties.

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  • 收稿日期:2021-12-28
  • 最后修改日期:2022-03-15
  • 录用日期:2022-03-15
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