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钢筋再生混凝土电化学除氯效果研究

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为探究遭受氯盐侵蚀钢筋再生混凝土耐久性修复路径,通过内掺氯盐方式模拟再生混凝土遭受氯盐侵蚀,开展再生混凝土电化学除氯试验,研究再生骨料特征和通电参数对电化学除氯效率的影响.研究表明,采用5~25 mm再生粗骨料粒径范围的钢筋再生混凝土电化学除氯效率是5~30 mm粒径范围钢筋再生混凝土的1.36倍;随再生粗骨料取代率增加,电化学除氯效率增大,取代率达50%时,钢筋再生混凝土除氯效率较普通混凝土提高约26%;随通电电流密度增大,再生混凝土除氯效率增大,相较1 A/m2,电流密度3 A/m2时的电化学除氯效率是其1.45倍,电流密度从1 A/m2增大到2 A/m2,再生混凝土除氯效率增幅比普通混凝土更明显;随除氯时间延长,再生混凝土除氯效率明显增大,相对普通混凝土,再生混凝土前期除氯效率占比更大,7 d除氯效率是28 d的51%;基于电化学除氯效率开展影响因素敏感性分析,结果表明,再生骨料取代率的影响大于再生骨料粒径,但电化学除氯时间影响最为明显.
Study on the Effect of Electrochemical Chloride Extraction Effect in Recycled Reinforced Concrete
To explore the durability repair pathways of recycled reinforced concrete affected by chlo-ride salt-induced corrosion,an electrochemical chloride extraction (ECE) experiment was carried out. Chloride salts were internally added to simulate the corrosion process,and the effect of recycled aggre-gate characteristics and electrical parameters on ECE efficiency were studied. The results showed that the ECE efficiency of recycled reinforced concrete with recycled coarse aggregate sizes of 5 to 25 mm was 1.36 times higher than that of the concrete with aggregate sizes of 5~30 mm. An increased re-placement rate of recycled coarse aggregate resulted in improved ECE efficiency. At a 50% replace-ment rate,the ECE efficiency was about 26% higher than that of ordinary concrete. As current densi-ty increased during electrification,the ECE efficiency also improved. The ECE efficiency at a current density of 3 A/m2 was 1.45 times higher than that at 1 A/m2. When the current density increased from 1 A/m2 to 2 A/m2,the improvement in ECE efficiency was more pronounced for recycled concrete than for ordinary concrete. Extending ECE duration significantly enhanced its efficiency,with recycled concrete showing a substantially higher chloride removal rate in the early stages compared to ordinary concrete. The chloride extraction efficiency within the first 7 days was 51% of that achieved in 28 days. Sensitivity analysis of the factors affecting ECE efficiency showed that the recycled aggregate re-placement rate had a greater impact than aggregate particle size. However,ECE duration had the most significant impact.

recycled reinforced concreteaggregate particle sizereplacement rate of recycled aggregateelectrochemical chloride extractioncurrent density

陈峰、屈锋、王功勋、程火焰、黄志、金浩

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湖南科技大学土木工程学院,湖南湘潭 411201

钢筋再生混凝土 骨料粒径 再生骨料取代率 电化学除氯 电流密度

国家自然科学基金国家自然科学基金湖南省教育厅科研项目湖南省教育厅科研项目湖南省教育厅科研项目湖南省自然科学基金

516782345180821318C032419A16420B2142019JJ50185

2024

防灾减灾工程学报
中国灾害防御协会 江苏省地震局

防灾减灾工程学报

CSTPCD北大核心
影响因子:0.529
ISSN:1672-2132
年,卷(期):2024.44(4)