| 摘要: |
| 综合考虑碱激发粉煤灰/矿渣（AAFS）混凝土的孔隙率影响、氯离子结合作用和多种离子间电化学耦合效应，在细微观尺度下建立多相多离子传输模型，并通过第三方试验对模型的可靠性进行验证.基于该模型，开展了粉煤灰/矿渣比和激发剂模数对AAFS混凝土抗氯离子侵蚀性能影响的数值研究.结果表明：较低的粉煤灰/矿渣比可明显提高AAFS混凝土抗氯离子侵蚀性能，这归因于其对降低孔隙率的贡献；激发剂模数为1.00时AAFS混凝土抗氯离子侵蚀性能最佳，过低或过高的激发剂模数均会增加氯离子在混凝土中的渗透深度. |
| 关键词: 碱激发混凝土 氯离子 耐久性 数值模型 |
| DOI：10.3969/j.issn.1007-9629.2023.06.004 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学优秀青年基金资助项目（52222805）；重庆市自然科学基金资助项目（cstc2021jcyj-msxmX1103）；上海交通大学深蓝计划项目（SL2021MS016） |
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| Numerical Estimation on Chloride Erosion Resistance of Alkali-Activated Concrete |
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CAI Yuxin1,2, LIU Qingfeng1,2
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1.State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2.Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai 200240, China
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| Abstract: |
| A multi-phase， multi-component ionic transport model was developed in a meso-micro scale， in which the porosity of alkali-activated fly ash/slag（AAFS） concrete， chloride binding effect and electrochemical coupling between multi-species were comprehensively taken into consideration. The reliability of the proposed model was verified by third-party experiments. Based on the proposed model， the effects of fly ash/slag ratio and activator modulus on chloride erosion resistance of AAFS concrete were numerically estimated. The results show that a lower fly ash/slag ratio can significantly improve the chloride erosion resistance of AAFS concrete due to its greater contribution to reduce the porosity. AAFS concrete with an activator modulus of 1.00 exhibits the best resistance to chloride erosion， and a too low or too high activator modulus will increase the penetration depth of chloride ions in concrete. |
| Key words: alkali-activated concrete chloride durability numerical model |
