多元胶凝材料体系再生混凝土复合盐侵蚀耐久性退化规律

摘要/Abstract

摘要： 我国西北地区土壤及地下水中含有大量侵蚀性硫酸根离子、镁离子与氯离子,导致在役再生混凝土(RAC)耐久性退化,严重制约了RAC在西北地区新建结构中的使用。为了研究多元胶凝材料体系RAC复合盐侵蚀耐久性退化规律,采用全浸泡、部分浸泡及干湿交替三种方式,分别模拟RAC结构构件不同部位的破坏方式,开展RAC耐久性试验。以相对动弹性模量、质量损失率及相对抗压强度为指标,研究不同侵蚀方式下RAC耐久性退化规律,分析多元胶凝材料体系中辅助胶凝材料的搭配方式及取代率对RAC耐久性退化的影响。全浸泡方式下,粉煤灰-矿渣双掺RAC相对动弹性模量下降较慢;部分浸泡方式下,辅助胶凝材料的引入降低了RAC抗复合盐侵蚀能力;干湿交替侵蚀方式下,RAC物理力学性能整体呈先增大后减小的趋势,多元胶凝材料体系RAC皆表现出优于纯水泥RAC的抗盐侵蚀能力

关键词: 再生混凝土, 耐久性, 复合盐侵蚀, 辅助胶凝材料, 侵蚀方式

Abstract: The soil and groundwater in Northwest China contain a large number of aggressive sulfate ions, magnesium ions and chloride ions, which leads to the durability degradation of in-service recycled aggregate concrete (RAC), and seriously restricts the use of RAC in new structures in Northwest China. In order to study the durability degradation law of RAC with multiple cementitious materials system subjected to compound salt erosion, the durability failures of different parts of RAC structural components were simulated by three modes: full immersion, partial immersion, alternating dry and wet immersion, and the durability tests of compound salt erosion of RAC were carried out. Taking the relative dynamic elastic modulus, weight loss rate and relative compressive strength as the indicators, the durability degradation law of RAC subjected to compound salt erosion under different erosion modes was studied, and the influences of the matching mode and replacement rate of supplementary cementitious materials in multiple cementitious materials system on the durability degradation law of RAC were analyzed. Under the full immersion mode, the relative dynamic elastic modulus of fly ash-slag double-mixed RAC decreases slowly. Under the partial immersion mode, the introduction of supplementary cementitious materials reduces the resistance of RAC to compound salt erosion. Under the alternating wet and dry immersion mode, the physical and mechanical properties of RAC increase first and then decrease, and the multiple cementitious materials system RAC shows better resistance to salt erosion than that of pure cement RAC.

Key words: recycled aggregate concrete, durability, compound salt erosion, supplementary cementitious material, erosion mode

中图分类号:

TU528.44

车志豪, 王家滨, 张凯峰, 范一杰. 多元胶凝材料体系再生混凝土复合盐侵蚀耐久性退化规律[J]. 硅酸盐通报, 2023, 42(8): 2733-2742.

CHE Zhihao, WANG Jiabin, ZHANG Kaifeng, FAN Yijie. Durability Degradation Law of Recycled Aggregate Concrete with Multiple Cementitious Materials System Subjected to Compound Salt Erosion[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2733-2742.

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