A New Composite Slab Using Crushed Waste Tires as Fine Aggregate in Self-Compacting Lightweight Aggregate Concrete.

Jing Lv,Tianhua Zhou,Hanheng Wu,Zuoqian He,Kaikai Li,Gen Li,Liurui Sang

doi:10.3390/ma13112551

Abstract

A composite slab comprised of self-compacting rubber lightweight aggregate concrete (SCRLC) and profiled steel sheeting is a new type of structural element with a series of superior properties. This paper presents an experimental research and finite element analysis (FEA) of the flexural behavior of composite slabs consisting of SCRLC to develop a new floor system. Four composite slabs specimens with different shear spans (450 mm and 800 mm) and SCRLC (0% and 30% in rubber particles substitution ratio) are prepared, and the flexural properties including failure modes, deflection at mid-span, profiled steel sheeting, and concrete surface stain at mid-span and end slippage are investigated by four-point bending tests. The experimental results indicate that applying SCRLC30 in composites slabs will improve the anti-cracking ability under the loading of composite slabs compared with composite slabs consisting of self-compacting lightweight aggregate concrete (SCLC). FEM on the flexural properties of SCRLC composites slabs show that the yield load, ultimate load, and deflection corresponding to the yield load and the ultimate load of composite slabs drop as the rubber particles content increases in SCRLC. The variation of SCRLC strength has less impact on the flexural bearing capacity of corresponding composite slabs. Based on the traditional calculated method of the ultimate bending moment of normal concrete (NC) composite slabs, a modified calculated method for the ultimate bending moment of SCRLC composite slabs is proposed.

Highlights

The reclamation of waste tires is beneficial for saving resources and protecting the environment.As a result of the huge consumption of concrete, crushing waste tires into particles and using them as aggregate in concrete is an efficient way for reuse
The results show that the utilization of rubber concrete in structural elements can make structural elements achieve good structural behaviors and should be a better way to amend partial performances of structural elements, such as lowering the self-weight, reducing the brittleness, improving the anti-cracking ability [12], and so on
Compared with the control mixture (SCLC), a reduction of around 54.4% for the compressive strength, 46.7% for the splitting tensile mixture (SCLC), a reduction of around 54.4% for the compressive strength, 46.7% for the splitting strength, 42.2% for the elastic modulus, and 14.2% for the apparent density occurred as the rubber tensile strength, 42.2% for the elastic modulus, and 14.2% for the apparent density occurred as the particles substitution ratio was raised from 0% to 50%

Summary

Introduction

As a result of the huge consumption of concrete, crushing waste tires into particles and using them as aggregate in concrete is an efficient way for reuse. Lightweight aggregate concrete (LAC) with advantages of light self-weight, excellent thermal insulating properties, and outstanding seismic behavior is popularly used in long-span structures, bridges and so on [13,14]. It has some shortcomings, such as high brittleness, the floating of lightweight aggregate during the vibrating process, and so on [15,16].

Methods

Discussion

Conclusion