Shear Behavior of Reinforced Post-Filling Coarse Aggregate Concrete Beams Produced by Creative Construction Process

Jinqing Jia,Yulong Hu,Zihan Meng,Lihua Zhang,Qi Cao

doi:10.3390/buildings11120576

Abstract

Different from the traditional concrete mixing procedure, the innovative post-filling coarse aggregate concrete (PFCC) reduces the cost of pumping concrete by increasing the coarse aggregate content and reducing the usage of cement. Previous studies have shown that PFCC enhances the compressive strength, elastic modulus, and flexural strength of concrete. In this paper, the shear behavior of 13 post-filling coarse aggregate concrete beams and 3 control beams was tested to determine the relationships between the shear performance of the beam and the post-filling coarse aggregate ratio, concrete strength grade, shear span ratio and stirrup reinforcement ratio. The results showed that the ultimate shear capacity of beam specimen increases first and then decreases with the increase in post-filling coarse aggregate ratio, reaching the maximum at 15% post-filling ratio. The results also indicated that the ultimate shear capacity of the beam increases with the increase in concrete strength grade and stirrup ratio. However, experimental results exhibited that the ultimate shear capacity decreases as the shear span ratio increases. This study provides a reference for the application of post-filling coarse aggregate concrete in engineering practice.

Highlights

Post-filling coarse aggregate concrete (PFCC) is a new type of coarse aggregate interlocking concrete [1,2,3]
This study aimed to investigate the shear behavior of post-filling coarse aggregate concrete beams and the effect of various parameters on the shear capacity of the beam
Note: ft and fcu are the tensile strength and compressive strength of concrete, respectively; λ is the shear span-to-depth ratio; ρsv is the shear reinforcement ratio; Vcr is cracking load; Vu is the ultimate shear capacity; Vu.exp is the experimental ultimate shear capacity; Vu.cal is the calculated ultimate shear capacity according to GB 50010; Δu is the mid-span deflection

Summary

Introduction

Post-filling coarse aggregate concrete (PFCC) is a new type of coarse aggregate interlocking concrete [1,2,3]. The post-filling coarse aggregate concrete reduces the use of cement [5] and increases the volume percentage of coarse aggregates, which improves the early-age cracking resistance of concrete [6]. It has been found that the strength properties [5] of concrete can be improved. The method of post-filling coarse aggregate has a significant effect in reducing concrete cost, reducing shrinkage cracking and increasing compressive strength. With the development of construction technology and facilities, the performance evaluation and application of PFCC could be extended to self-compacting concrete [7], ultra-high-strength concrete [8]

Objectives

Results

Conclusion