不同介质环境下改性再生混凝土冻融损伤分析及寿命预测
Freeze-thaw damage analysis and life prediction of modified recycled concrete under different medium environments
周金枝 1石赐明 2钟楚珩 3陆伟银 1吴学2
作者信息
- 1. 湖北工业大学土木建筑与环境学院,湖北武汉 430068
- 2. 湖北工业大学土木建筑与环境学院,湖北武汉 430068;中建三局集团(深圳)有限公司,广东深圳 518000
- 3. 湖北工业大学土木建筑与环境学院,湖北武汉 430068;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;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
- 折叠
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.
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.
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Key words
modified recycled concrete/different media environment/Weibull distribution/freeze-thaw damage/life prediction引用本文复制引用
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)
出版年
2024
NETL
NSTL
万方数据