| 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（AAS）砂浆的氯离子传输性能，并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：随着饱和度的降低，碱矿渣砂浆试件的电导率和表观氯离子扩散系数显著减小；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；硅酸钠激发体系的表观氯离子扩散系数小于同饱和度的氢氧化钠激发体系，但二者差距随着饱和度的降低而减小. |
| 关键词: 碱矿渣 氯离子传输 饱和度 孔结构 孔隙水分布 |
| DOI：10.3969/j.issn.1007-9629.2022.12.001 |
| 分类号:TU528.01 |
| 基金项目:先进土木工程材料教育部重点实验室（同济大学）开放基金资助项目（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）；福州大学贵重仪器设备开放测试基金资助项目（2020T032） |
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| Experimental Study on Chloride Transport in Unsaturated Alkali-Activated Slag Mortars |
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ZHANG Yong, FANG Yuchi, SHEN Ying, YANG Zhengxian
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College of Civil Engineering， Fuzhou University， Fuzhou 350108， China
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| Abstract: |
| The chloride transport characteristics of alkali-activated slag （AAS） mortars at various degrees of water saturation were evaluated comprehensively by means of conductivity tests， diffusion tests and dry-wet cycle tests. The mechanism of unsaturated chloride transport of AAS mortars was illustrated by characteristics of pore structure and moisture distribution at different degree of saturations. Results show that the conductivity and apparent chloride diffusion coefficient of AAS mortar specimens decrease significantly with the decrease of saturation. In the condition of dry-wet cycles the specimen with lower saturation has a faster chloride penetration and there is no clear chloride peak in the specimen. The influential depth of dry-wet cycles on chloride penetration is increased for the specimen of a lower saturation. The apparent chloride diffusion coefficient is lower 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. |
| Key words: alkali-activated slag （AAS） chloride transport degree of saturation pore structure pore water distribution |
