预制箱梁湿接缝维修及预养护技术研究
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关键词湿接缝，裂缝修补，水泥基渗透结晶，界面剂，高强砂浆中图分类号：TU74;U443.35；U446.1 文献标志码：A DOI： 10.15935/j.cnki.jggcs.202504.0018
AbstractPrecast concrete smallbox girders are extensively adopted in China owing to their lightweight，high construction eficiency，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 crystaline 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）.Al experiments were conducted in strict compliance with relevant standards，encompassng 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.Theresults 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，compresive，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 necessry to identifythe most effective material combinations.
Keywordswet joints，crack repair，cementitious crystalline waterproofing，interface treating agent，highstrength mortar
0 引言
预制箱梁在我国城市桥梁建设中应用较为广泛，预制拼装技术可以显著缩短工期，减少现场的浇筑量，但在实际应用中，错误的施工方式、养护不当等问题可能会导致混凝土出现初始缺陷，导致预制小箱梁湿接缝处容易发生早期开裂。（剩余12812字）
