摘要
混凝土结合面是装配式结构耐久性的薄弱部位,为研究装配式结构混凝土结合面处混凝土的碳化特征和规律,考虑施工中存在后浇混凝土前不清理结合面、不洒水湿润的情况,设计制作了包括4种清理状况的混凝土叠合试件,再钻取含有结合面的圆柱体芯样进行快速碳化试验,研究不同清理状况对结合面碳化性能的影响。结果表明:结合面碳化速度明显大于混凝土本体;按照规程要求清理的结合面碳化系数相对稳定,不随碳化时间而发生明显变化,碳化系数约为混凝土本体的1.5倍;若不清理也不洒水湿润,结合面碳化系数随碳化时间的增加有明显增大,最大可达到混凝土本体的3倍;在清理结合面的情况下,是否洒水湿润对结合面的碳化性能影响不显著,但在不清理的情况下,洒水湿润可以明显改善结合面的抗碳化能力;预制构件粗糙面处理方式会影响结合面的抗碳化能力。此外,提出了结合面混凝土碳化模型的修正方法,为装配式混凝土结构耐久性设计与评定提供参考。
The concrete interface is the weak part of the durability of the prefabricated structure.In order to study the carbonization characteristics and laws of the concrete interface of the prefabricated structure,it was designed and made in consideration of the situation that the interface was not cleaned,sprinked and wetted before the concrete was poured.The concrete composite specimens with four cleaning conditions were designed and fabricated,and then a cylindrical core sample containing the interface was drilled for rapid carbonization test to study the effect of different cleaning conditions on the carbonization performance of the interface.The results show that the carbonization speed of the bonding surface is significantly greater than that of the concrete body.The carbonization coefficient of the interface cleaned in accordance with the standard is relatively stable and does not change significantly with the carbonization time.The carbonization coefficient is about 1.5 times that of the concrete body.If it is not cleaned or sprinkled with water,the carbonization coefficient of the interface increases significantly with the increase of the carbonization time,and the maximum can reach 3 times of the concrete body.In the case of cleaning the interface,whether sprinkling and wetting has no significant effect on the carbonization performance of the interface,but without cleaning,sprinkling and wetting can significantly improve the anti-carbonization ability of the interface fabricated concrete structure.The rough surface treatment of the prefabricated component will affect the anti-carbonization ability of the interface.In addition,a method for modifying the carbonation model of the interface concrete is proposed to provide a reference for the durability design and evaluation of the prefabricated concrete structure.
作者
欧阳志鹏
孙彬
王霓
毛诗洋
OUYANG Zhipeng;SUN Bin;WANG Ni;MAO Shiyang(China Academy of Building Research,Beijing 100013,China)
出处
《建筑结构》
CSCD
北大核心
2021年第5期126-132,140,共8页
Building Structure
基金
国家重点研发计划项目(2016YFC0701800)
住房和城乡建设部科技项目(2016-K5-043)
中国建筑科学研究院应用技术研究课题(20150112330730050)。
关键词
装配式结构
混凝土结合面
碳化性能
碳化模型
耐久性
碳化系数
prefabricated structure
concrete interface
carbonization performance
carbonation model
durability
carbonization coefficient
