DEVELOPMENT OF PSEUDO-DUCTILE PERMANENT FORMWORK FOR DURABLE CONCRETE STRUCTURE
The present investigation focuses on a new approach for the construction of durable concrete structure.Using pseudo-ductile cementitious composites (PDCC) of relatively 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. In this paper, the development of PDCC for formwork fabrication is first described. Then, the bond between PDCC and concrete, in relation to various surface treatment methods, will be discussed. Test results on concrete beams made with GFRP reinforced PDCC formwork are then presented, and compared to theoretical predictions. A design example is performed to demonstrate the use of GFRP/PDCC permanent formwork for constructing the deck of a footbridge. The results of this investigation show promise of the technology for practical applications.
Pseudo-ductile cementious composites Permanent formwork Durability
Leung, Christopher K.Y. Cao, Qian
Hong Kong University of Science and Technology,Hong Kong, China
国际会议
上海
英文
208-219
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）