不同饱和度碱矿渣砂浆中氯离子传输试验研究
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福州大学

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先进土木工程材料教育部重点实验室(同济大学)开放基金资助(202102);福建省自然科学基金资助项目(2020J01482);国家自然科学基金资助项目(51978171)


Experimental Study on Chloride Transport in Unsaturated Alkali-activated Slag Mortars
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Fuzhou University

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Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education (202102) ;Natural Science Foundation of Fujian Province, China(2020J01482);National Natural Science Foundation of China(51978171)

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    摘要:

    采用电导率、扩散和干湿循环试验综合评估不同饱和度碱矿渣砂浆的氯离子传输性能,依据孔结构和不同饱和度下的孔隙水分布阐明氯离子在非饱和碱矿渣砂浆中的传输机理。结果表明:随着饱和度降低,碱矿渣砂浆试件的电导率和氯离子扩散系数会显著减小。在干湿循环作用下,低饱和度试件的氯离子渗透更快且试件内无明显氯离子浓度峰值。干湿循环作用对氯离子渗透的影响深度随着试件饱和度的降低而加大。硅酸钠激发体系的抗氯离子渗透能力大于同饱和度的氢氧化钠激发体系,但二者的差距会随着饱和度降低而减小。

    Abstract:

    The chloride transport properties of alkali-activated slag AAS mortars at various saturation levels were evaluated comprehensively by means of conductivity tests, diffusion tests and cyclic drying/wetting tests. The mechanism of unsaturated chloride transport of AAS mortars was illustrated according to characteristics of pore structure and moisture distribution at different saturations. Results show that the conductivity and chloride diffusion coefficient of AAS mortar specimens decrease significantly with the decrease of saturation. In the condition of drying/wetting cycles the specimen with lower saturation has a faster chloride penetration and there is no clear peak of chloride content in the specimen. The influential depth of drying/wetting cycles on chloride penetration is increased for the specimen of a lower saturation. The resistance to chloride penetration is higher in Na2SiO3 activated system than in NaOH activated system of the same saturation level, while the resistance difference of the two systems becomes smaller for a lower saturation.

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  • 收稿日期:2021-10-01
  • 最后修改日期:2021-11-29
  • 录用日期:2021-12-06
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