预制箱梁湿接缝维修及预养护技术研究
Research on Wet Joint Repair and Pre-maintenance Technology of Precast Box Girders
预制混凝土小箱梁因其结构轻巧、施工高效及造价低廉在国内得到广泛应用。由于湿接缝与小箱梁混凝土强度存在差异,在施工过程中容易引发收缩徐变差异,导致早期开裂。因此,需选用适宜的材料进行修补及预养护。为比较不同类型材料的力学性能,本文选取了东方雨虹PCC-501、凯顿T1、赛柏斯浓缩剂三种水泥基渗透结晶防水涂料,环宇秀朴-SP界面剂,环宇秀朴SJ40F和西卡31CFN两种高强砂浆,依据相关规范开展了湿基面粘结强度试验、抗压抗折试验等。此外,针对不同涂刷顺序制定了12组现场实桥涂刷方案,并通过现场施工分析总结了最佳施工次序。研究结果显示,在水泥基材料中,东方雨虹的湿基面强度最高,凯顿的抗渗能力最强;界面剂的14 d拉伸粘结强度超过最低标准;在高强砂浆材料中,西卡31CFN在抗折、抗压和抗拉强度方面均表现最优。在现场施工过程中,采用水泥基渗透结晶型防水材料、界面剂和高强砂浆的涂刷顺序效果最优,但不同材料的最优组合形式仍需进一步深入研究。
Precast concrete small box girders are extensively adopted in China owing to their lightweight, high construction efficiency, and cost-effectiveness. However, strength variations between wet joints and box girder concrete may trigger differential shrinkage and creep during construction, potentially causing early cracking. Consequently, selecting appropriate materials for repair and pre-maintenance is paramount. This study investigates the mechanical properties of three cementitious crystalline waterproofing materials (Oriental Yuhong PCC-501, Kaiton T1, and Cybers Concentrate), one interface agent (Huanyu Xiupu-SP), and two high-strength mortars (Huanyu Xiupu SJ40F and Sikadur 31CFN). All experiments were conducted in strict compliance with relevant standards, encompassing tests for wet surface bonding strength, compressive strength, and flexural strength. Furthermore, twelve brushing schemes with varying application sequences were designed for bridge implementation, with the optimal construction order determined through field analysis. The results demonstrate that among the cementitious materials, Oriental Yuhong exhibits the highest wet substrate bonding strength, while Kaiton achieves superior impermeability. The interface agent attains a 14-day tensile bond strength exceeding the minimum standard requirement. Among high-strength mortar materials, Sikadur 31CFN demonstrates optimal performance in flexural, compressive, and tensile strength. The optimal brushing sequence entails the sequential application of cementitious crystalline waterproofing materials, interface agents, and high-strength mortars. However, further research is necessary to identify the most effective material combinations.
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国家自然科学基金(52378312)
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