摘要
内置保温墙体由聚苯板、钢丝焊接网和模板搭设拼装后现场浇筑混凝土而成,其中聚丙烯连接件用来连接钢丝焊接网和聚苯板。为研究聚丙烯连接件在混凝土环境中的长期耐久性能,利用加速试验将聚丙烯连接件浸泡在20、40℃和60℃碱溶液中分别进行老化处理,通过观测表观形貌,测试水吸收性能、力学性能和热性能,获得加速老化后聚丙烯连接件质量增量、极限承载力、刚度保留率、差示扫描量热分析(DSC)曲线和动态热机械分析(DMA)曲线的变化规律。试验结果表明,经过20、40℃和60℃碱溶液浸泡6个月后,聚丙烯连接件表观形貌无明显变化,试样质量随浸泡时间延长而增加。试样极限荷载和刚度在老化前3个月基本保持不变,在老化6个月后均增长40%~50%。老化6个月后,聚丙烯连接件的热性能无明显退化。老化前后试样的DSC曲线和DMA曲线基本一致,老化作用的影响较小。
Built-in thermal insulation wall is made of polystyrene board,welded steel mesh and formwork,and then concrete is poured on site.The polypropylene connector is used to connect the welded steel mesh and polystyrene board.In order to investigate the long-term durability of polypropylene connectors in a concrete environment,this accelerated tests was adopted by immersing polypropylene connectors in alkaline solutions at 20℃,40℃,and 60℃for aging treatment.By observing the apparent morphology,the water absorption properties,mechanical properties and thermal properties were tested,and the change trends of the mass increment,ultimate bearing capacity and stiffness retention rates,differential scanning calorimetric(DSC)and dynamic mechanical analysis(DMA)curves of the polypropylene connector after accelerated aging were obtained.The test results show that after accelerated aging in the alkaline solutions at 20℃,40℃,and 60℃for 6 months,there is no obvious change on the apparent morphology of polypropylene connectors,while the mass of specimens is increased with the extension of immersion time.In the first 3 months of aging,the ultimate load and stiffness of the specimen are basically unchanged,while both increased by 40%~50%after 6 months of aging.After aging for 6 months,the thermal properties of polypropylene connectors have no obvious degradation.The DSC and DMA curves of specimens aged for 6 months are basically the same as those of the unaged specimens,and the effect of aging is small.
作者
赵军
杨守迪
王自柯
王帅斌
ZHAO Jun;YANG Shoudi;WANG Zike;WANG Shuaibin(School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《建筑结构》
北大核心
2023年第17期112-118,133,共8页
Building Structure
基金
国家自然科学基金项目(52278282,51908512)
教育部创新团队发展计划(IRT_16R67)
中原千人计划(ZYQR201912029)
河南省高等学校重点科研项目(21A560012)
河南省重点研发与推广专项(科技攻关)项目(222102320081)。
关键词
内置保温墙体
聚丙烯连接件
碱性环境
加速老化
力学性能
热性能
built-in thermal insulation wall
polypropylene connector
alkaline environment
accelerated aging
mechanical property
thermal property
