作者：周金枝1, 石赐明1,4, 钟楚珩1,2,3, 陆伟银1, 吴学1,4
作者单位：1. 湖北工业大学土木建筑与环境学院，湖北 武汉 430068;
2. 湖北工业大学 河湖健康智慧感知与生态修复教育部重点实验室，湖北 武汉 430068;
3. 中铁大桥局集团有限公司桥梁智能与绿色建造全国重点实验室，湖北 武汉 430034;
4. 中建三局集团(深圳)有限公司，广东 深圳 518000
关键词：改性再生混凝土;不同介质环境;Weibull分布;冻融损伤;寿命预测
摘要：
为探究不同冻融环境下改性再生混凝土耐久性问题，该文选取5%水玻璃溶液和8%硅烷溶液分别对再生骨料浸泡进行单一改性和复合改性。对改性后的再生混凝土分别置于清水、3.5% NaCl溶液和5% Na2SO4溶液3种介质环境中进行快速冻融试验，通过再生混凝土质量损失和相对动弹性模量变化分析其劣化机理，并引入Weibull模型对再生混凝土进行损伤和寿命预测。结果表明：相同冻融环境下，再生骨料经过改性处理后的再生混凝土抗冻耐久性改善明显，且复合改性改善效果优于单一改性效果。同一试验组在不同冻融环境下的损伤程度依次为3.5% NaCl溶液>5% Na2SO4溶液>清水。引入Weibull模型能较好地反映不同环境下改性再生混凝土的冻融损伤和预测寿命，为改性再生混凝土应用于实际工程提供理论基础和参考依据。
Freeze-thaw damage analysis and life prediction of modified recycled concrete under different medium environments
ZHOU Jinzhi1, SHI Ciming1,4, ZHONG Chuheng1,2,3, LU Weiyin1, WU Xue1,4
1. College of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China;
2. Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education，Hubei University of Technology，Wuhan 430068，China;
3. National Key Laboratory of Bridge Intelligence and Green Construction，China Railway Major Bridge Engineering Group Co., Ltd.，Wuhan 430034，China;
4. China Construction Third Bureau Group (Shenzhen ) Co., Ltd., Shenzhen 518000 , China
Abstract: In order to explore the durability of modified recycled concrete under different freeze-thaw environments, this paper selects 5% water glass solution and 8% silane solution to carry out single modification and composite modification of recycled aggregate soaking, respectively. The modified recycled concrete is placed in three medium environments of clear water, 3.5 % NaCl solution and 5 % Na2SO4 solution for rapid freeze-thaw test. The deterioration mechanism is analyzed by the mass loss and relative dynamic elastic modulus of recycled concrete, and the Weibull model is introduced to predict the damage and life of recycled concrete. The results show that under the same freeze-thaw environment, the frost resistance durability of recycled concrete after modified recycled aggregate is obviously improved, and the improvement effect of composite modification is better than that of single modification. The damage degree of the same test group in different freeze-thaw environments was 3.5% NaCl solution > 5% Na2SO4 solution > water. The Weibull model can better reflect the freeze-thaw damage and life prediction of modified recycled concrete under different environments, and provide theoretical basis and reference for the application of modified recycled concrete in practical engineering.
Keywords: modified recycled concrete;different media environment;Weibull distribution;freeze-thaw damage;life prediction
2024, 50(7):17-25 收稿日期: 2022-09-07;收到修改稿日期: 2022-11-03
基金项目: 国家自然科学基金青年科学基金项目（52108315）；桥梁结构健康与安全国家重点实验室项目（BHSKL19-04-KF）；湖北省教研项目（2017314）；武汉市知识创新专项曙光计划项目（2023020201020375）
作者简介: 周金枝（1964-），女，湖北武汉市人，教授，研究方向为土木工程材料和结构强度设计与仿真。
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