Flexural Behavior of Extruded DFRCC Panel and Reinforced Concrete Composite Slab

Chang-Geun Cho,Seung-Jung Lee,Byung-Chan Han,Yun Yong Kim,Bang Yeon Lee

doi:10.1155/2012/460541

Abstract

This paper presents a new reinforced concrete (RC) composite slab system by applying an extruded Ductile Fiber Reinforced Cement Composite (DFRCC) panel. In the proposed composite slab system, the DFRCC panel, which has ribs to allow for complete composite action, is manufactured by extrusion process; then, the longitudinal and transverse reinforcements, both at the bottom and the top, are placed, and finally the topping concrete is placed. In order to investigate the flexural behavior of the proposed composite slab system, a series of bending tests was performed. From the test results, it was found that the extruded DFRCC panel has good deformation-hardening behavior under flexural loading conditions and that the developed composite slab system, applied with an extruded DFRCC panel, exhibits higher flexural performance compared to conventional RC slab system in terms of the stiffness, load-bearing capacity, ductility, and cracking control.

Highlights

In multistory building structures the slab and floor units account for something like 50 to 60% of the material requirements
The purpose of the current study is to develop a new approach for Ductile Fiber-Reinforced Cement Composite (DFRCC) and reinforced concrete (RC) composite slab systems by applying an extruded DFRCC panel; this new approach has some advantages in terms of minimization of crack width, pseudo-deformation hardening behavior based on multiple cracking, high-ductile
The extruded DFRCC panel has three ribs, allowing it to obtain completely composite action with topping concrete, as shown in Figure 6, which gives a crosssection of the developed RC composite slab system applied with the extruded DFRCC panel

Summary

Introduction

In multistory building structures the slab and floor units account for something like 50 to 60% of the material requirements. DFRCC retains a high-ductile deformation capacity through the bridging of microcracks by synthetic fibers, where bridging in turn leads to multiple cracking [1–3]. The production methods of DFRCC include cast in place, spray, and extrusion [7, 8]. Among these methods, extrusion is a process used to create a precast product of a fixed cross-section. By adopting the extrusion process for DFRCC, the mechanical properties such as strength, elastic modulus, and ductility can be enhanced due to the lower porosity of the extruded composites, which is attributed to mechanical compaction as well as to the aligned orientation of fibers. There have been only few studies on the structural application of an extruded DFRCC panel such as composite slab

Objectives

Results

Conclusion