International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Study on the Compression behaviour of Self-Compacting Concrete Columns using Expanded Metal Mesh as Internal Confinement KRISHNAPRIYA A K1, SARAVANA KUMAR N2, SREE RAMESWARI A3 1 PG
Student, Department of Civil Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamil Nadu, India. 2 Assistant Professor, Department of Civil Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamil Nadu, India. 3 PG Student, Department of Civil Engineering, Mepco Schlenk Engineering College, Sivakasi, Tamil Nadu, India. ---------------------------------------------------------------------***--------------------------------------------------------------------In this study, 5 circular short SCC column specimens Abstract – Traditional ties reinforcement cannot were used. Out of them, 4 specimens were confined using provide superior confinement for concrete column due to EMM layer with various opening sizes of mesh having the overlapping hoops and bends made by ties. This constant mesh thickness. The column specimens were tested paper provides an improvement in confinement due to under uniaxial compression. The ultimate load capacity, the usage of Expanded Metal Mesh(EMM) in addition to maximum deflection, ductility, stress- strain curves were the regular tie reinforcement. Total of 5 column investigated in this study. The analytical results from ANSYS specimens were cast and cured. Out of 5, 4 specimens Workbench were compared with the results obtained from were internally wrapped using Expanded Metal Mesh. laboratory experiments. The basic concern of this study was Opening sizes of mesh are varied in each specimen to provide a better lateral reinforcement using EMM with ties to enhance the confinement and the performance of SCC having constant mesh thickness. Due to the congested short columns. reinforcement, Self-Compacting Concrete was used. The specimens were tested under uniaxial compression till 2. EXPERIMENTAL PROGRAM failure. The results indicated that the internally confined column specimens shows significant improvement in the The experimental investigation were conducted as strength and ductility. discussed below. SCC with a target strength of M40 grade was designed using Nan-su-et.al method. The specimens were cylindrical with a height of 700 mm and diameter of 130mm. These specimens were internally reinforced with the same quantity of steel reinforcement. The fresh concrete were tested for satisfying the basic requirements of SCC by using Slump Flow test, U-Box test, V-Funnel test and L-Box test. In the preliminary stage, 3 cubes and 3 cylinders were cast for M40 grade of concrete. The average compressive strength of SCC of M40 was found and verified. Total of 5 specimens were cast and cured. 4 specimens were internally wrapped using EMM around the reinforcement in one layer. After 28 days curing, these specimens were tested under UTM of 1000kN to find out the compressive strength of concrete.
Key Words: Self-Compacting Concrete, Expanded Metal Mesh, Confinement, Ties.
1. INTRODUCTION The non-uniform distribution of reinforcement affects many engineering properties such as ductility, crack resistance, durability and in-plane strength. The shortage of confinement offered by ties paves a way for using materials such as Expanded Metal Mesh to confine the concrete core. EMM were used to reduce the reinforcement congestion caused due to the overlapping hoops and bends made by ties. This is formed by mild steel having diamond opening. This is advantageous due to its low cost, easy availability and flexibility during installation. Self-Compacting Concrete is widely used in areas of congested reinforcement. This helps to improve the reliability and uniformity of the concrete. SCC has the ability to flow under its own weight without vibration. EMM can be used as a substitute for conventional reinforcement. The structural behaviour of SCC columns with EMM as internal confinement is little known.
Š 2017, IRJET
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Impact Factor value: 5.181
Table -1: Details of column specimens
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S. No
Specimens
1 2 3 4 5
CO1 CO2 CO3 CO4 CO5
Mesh Specifications Mesh thickness(mm) 1.5 1.5 1.5 1.5
Mesh opening sizes(mm) 15X30 12X40 16X40 15X45
ISO 9001:2008 Certified Journal
No. of EMM layer 1 1 1 1
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