INTERNATIONAL RESEARCH JOURNAL OF ENGINEERING AND TECHNOLOGY (IRJET) VOLUME: 04 ISSUE: 02 | FEB -2017
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E-ISSN: 2395 -0056 P-ISSN: 2395-0072
Experimental Study on Behaviour of Steel Tubular Composite Column Filled with Recycled Waste R.Priyadharshini , P. Ashokkumar2
1 1Student, Department of Civil Engineering (ME-structure), Sona College of Technology, Salem, India 2Assistant
professor,Department of Civil Engineering, Sona College of Technology, Salem, India
-------------------------------------------------------------------------****------------------------------------------------------------------------------------Abstract— Over the past few decades, developments of new techniques are seen in all the industries and activities. In such a case Concrete Filled Steel Tubular (CFST) column has become popular and plays an eminent role in constructions. This popularity is owing to its structural behaviour like excellent seismic resistivity properties like high ductility, high stiffness and large energy absorption capacity. The intentions of thiswork is to study the behaviour of CFST columns in-filled with concrete mixed with recycled coarse aggregate(RCA) and paper by partial replacement of coarse aggregate, which is subjected to axial loading. Since construction and demolition waste(C&D) and paper waste causes considerable environmental impact, these materials should be recycled in all possible way. The load carrying capacity, stress-strain behaviour is studied on the CFST columns of length to diameter ratio 4 and thickness of 4.8mm. The grade of concrete used is M20. The paper is made into papercrete before mixing into the concrete mix. The optimum percentages of recycled coarse aggregate and paper were found from the compression and split tensile strength tests. That particular proportion is mixed with concrete and filled in the steel tubular column. The CFST column is tested for studying load carrying capacity and stress-strain behaviour. Keywords—CFST aggregate
column,paper,recycled
coarse
I. INTRODUCTION
Concrete-filled steel tubular (CFST) columns have been progressively used in many upcoming modern structures (8). This is due to the fact that CFST columns have high strength, high stiffness, that is, the steel tube resists any tensile forces, bending moments and shear forces, and offers confinement to the concrete (1).This confinement acts as both longitudinal and lateral reinforcement and subjected to biaxial stresses of longitudinal compression and hoop tension. The concrete core can also restrain local buckling of the steel tube under different loading history. At the same time, it is stressed tri-axially (5).
1.1 COMPOSITE COLUMN
These composite columns are very important application of composite constructions. The use of
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composite column can result in significant savings in column size, which lead to significant economic savings. The size of CFST column is smaller than that required for RC columns to support same loads. Because of its high resistance for a small cross sectional area, it maximizes the useable floor area. The need of longitudinal reinforcement, transverse reinforcement and formwork are satisfied with the structural behavior of steel tube and it tends to rapid construction and prevents excessive concrete spalling. From the past study it is mentioned that, on the concentric compression behavior of CFT columns, the ultimate axial strength of CFT columns is considerably affected by the thickness of the steel tube, as well as by the shape of its cross section.
1.2 SCOPE
Currently, civil engineers have been challenged to convert the industrial wastes to useful building and construction materials. Since the usage of natural aggregate is getting more and more intense with the advanced development. We ought to change the practice of using natural aggregate by recycled aggregate. The troubling information of CO₂ emission is, it is mainly produced from the construction industries which leads to global issues, On the other hand, people’s longing to live eco-environment. This desire is continuously increasing. In order to resolve these kinds of matters, this study carried out by reusing coarse aggregate and paper waste as partial replacement for coarse aggregate in the concrete of CFST column and suggest this system in future prefabrication industries. Further theoretical investigation is done on load carrying capacity of CFST column by Eurocode 4.
II. INVESTIGATION APPROCHES
After a general views on CFST columns and necessity on reusing the waste in all possible ways. A series of laboratory tests were carried out to assess fresh and hardened concrete properties using different proportions of recycled coarse aggregate and paper. About 100 specimens of concrete cubes and cylinders with 15 different mixes were casted and tested for compression and tensile strength. By observing the results, the optimum % of recycled coarse aggregate with paper by replacing coarse aggregate is designated.
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