高延性永久模板在建造耐久混凝土结构中的应用  

Pseudo-ductile permanent formwork for construction of durable concrete structures

作　　者：梁坚凝[1] 曹倩[1] 

机构地区：[1]香港科技大学土木工程系

出　　处：《东南大学学报（自然科学版）》2006年第S2期110-115,共6页Journal of Southeast University：Natural Science Edition

基　　金：香港研究资助局资助项目(RGC)(HKUST 6138/04E).

摘　　要：介绍了高延性水泥基复合材料(PDCC)永久性模板在建造耐久混凝土结构中的应用.在预浇筑的PDCC永久性模板上浇筑普通混凝土,两者共同组成结构构件.低水灰比永久性模板具有的低渗透性和抗开裂能力使其成为防止钢筋锈蚀的有效保护层.在初步应用上有2种途径:使用素PDCC基体制作永久性模板和使用玻璃纤维增强塑料筋(GFRP reinforcement)加固PDCC模板从而为实际构件提供有效的承载力.进一步的应用可在构件中配合使用GFRP Bar和钢筋从而同时获得足够的承载力和延性破坏形式.介绍了PDCC永久性模板的制作过程和力学性能,比较了在不同表面处理方法下模板与普通混凝土之间的粘结力,并且分析了使用GFRP Bar加固模板制作构件的4点弯曲的理论计算和实验结果.初步的实验结果显示了该技术在实际应用上的广阔前景.The present investigation focuses on a new approach for the construction of durable concrete structures. Using pseudo-ductile cementitious composites (PDCC) of low water/binder ratio, permanent formworks are first fabricated. Normal concrete is then cast to make structural components. With low permeability and very high crack resistance, the permanent formwork acts as a very effective surface cover to prevent the corrosion of steel reinforcements. The formwork can be made with PDCC alone, or with the incorporation of glass fiber reinforced plastics (GFRP) rods. In some structural components, the GFRP reinforcements will be sufficient to provide the necessary load-carrying capacity. In others, steel reinforcements can be added to produce a component with very high durability (as steel is well protected) as well as ductile behavior. The development of PDCC for formwork fabrication is first described. Then, the bond between PDCC and concrete, in relation to various surface treatment methods, is discussed. Test results on concrete beams made with GFRP reinforced PDCC form-work are presented and compared to theoretical predictions. While our research on PDCC permanent formwork is still at the infant stage, the available results show that this technology is promising in practical applications.

关 键 词：永久性模板 耐久性 高延性水泥基复合材料 应变-硬化特性 

分 类 号：TU377[建筑科学—结构工程]