Title: Evaluation of Bond Strength between Ultra-High Performance Reactive Powder Composite Materials and Fiber-Reinforced Concrete by Slant Shear Test
Author(s): A. Hassan, M. Kawakami, S. Matsuoka, and H. Tanaka
Publication: Symposium Paper
Appears on pages(s): 215-230
Keywords: bond strength; concrete; fibers; reactive powder composites; slant shear; ultra-high performance materials
The use of precast panels made of new ultra-high performance reactive powder composite materials (RPCM) in civil construction as permanent formwork for concrete structures and buried forms for bridge slabs is a new application that has great applicability prospects due to the high strength and durability of these new materials. The bond at the interface between RPCM and fiber-reinforced ordinary cement concrete is studied in this paper using slant shear tests. The program aimed at testing the bond between a substrate of RPCM with different surface treatments and an overlay of ordinary concrete with different fiber contents. This study concluded that casting the bonding surface of the substrate on air-cell plastic sheets produces a rough surface with concavities and thus provides an easy and effective way to increase the bonding strength. The results of this method of surface preparation are comparable to conventional methods like sand-blasting or grinder treatment. Increasing the fiber content of the concrete overlay in-creases the bond strength with the RPCM substrate if the surface of RPCM is not treated. When the surface of RPCM is roughened to obtain mechanical interlock, the high fiber content of the concrete overlay negatively affects the bond strength. A volumetric fiber content of 0.1% in the concrete overlay is found to be adequate in all surface types.