基于多元复合胶凝材料的海水碱激发材料的性能
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中山大学土木工程学院

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TB32

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国家自然科学基金(No. 52378280);广东省自然科学基金(No. 2019A1515011981)


Properties of Seawater Alkali-Activated Materials Based on Multi-Component Composite Cementitious Materials
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School of Civil Engineering, Sun Yat-sen University

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    摘要:

    为了研究海水拌合碱激发材料性能,探讨了基于多元复合胶凝材料的海水拌合碱激发材料水化反应过程、力学与抗侵蚀等性能发展规律。结果表明:海水拌合对碱激发矿渣的水化反应过程具有一定的抑制作用,宏观上不同龄期的抗压强度也在一定程度呈现降低趋势,不利于强度发展;粉煤灰和硅灰会降低海水拌合碱激发材料的水化反应速率、早期强度和韧性,但其后期强度及韧性增长潜力显著,其中硅灰-粉煤灰-矿渣三元体系7~28天的强度与韧性增长率分别达到50.9%和86.7%。与碱激发矿渣相比,粉煤灰和硅灰的掺入会在一定程度上提高海水碱激发材料的电通量渗透性和氯离子迁移系数,这与其微观结构表现一致,但三者仍同属于一个氯离子渗透性等级,即中等渗透性等级(电通量法)。

    Abstract:

    In order to investigate the properties of seawater mixing alkali-activated materials, the development law of hydration reaction, mechanics and corrosion resistance of seawater alkali-activated materials based on multi-component composite cementitious materials was studied. The results show that seawater mixing has a certain inhibitory effect on the hydration reaction of alkali-activated slag, and the compressive strength of SLCM at different ages also shows a decreasing trend to a certain extent, which is not conducive to the development of strength. Fly ash and silica fume can reduce the hydration reaction rate, early strength and toughness of the seawater alkali-activated materials, but their strength and toughness increase potential is significant in the later period, in which the strength and toughness growth rate of the silica-fly ash-slag terpolymer system from 7 to 28 days reaches 50.9% and 86.7%, respectively. Compared with alkali-activated slag, adding fly ash and silica fume can improve the electric flux permeability and chloride ion mobility coefficient of alkali excited materials in seawater to a certain extent, which is consistent with their microstructure, but the three still belong to the same chloride ion permeability grade, i.e., medium permeability grade (electric flux method).

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赵计辉,吴坤润,杨刚强. 基于多元复合胶凝材料的海水碱激发材料的性能[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-12-21
  • 最后修改日期:2024-05-17
  • 录用日期:2024-05-21
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