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STUDY ON EFFECT OF CHANGE IN FINENESS MODULUS OF COPPER SLAG ON THE COMPRESSIVE STRENGTH OF CONCRETE

Vamsi Pradeep I1, Suresh Reddy S2, Kishore Kumar M3
  1. Assistant Professor, Department of Civil Engineering, BVRIT Narsapur, Hyderabad, A.P., India
  2. M. Tech Scholar, Department of Civil Engineering, GVPCOE, Visakhapatnam, A.P., India
  3. Assistant Professor, Department of Civil Engineering, GVPCOE, Visakhapatnam, A.P., India
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International Journal of Innovative Research in Science, Engineering and Technology

Abstract

A study pertaining to the effect caused on concrete, due to the change in source and fineness modulus of copper slag has been carried out. It was found that as the fineness modulus of copper slag increased, the compressive strength value of concrete in which cement was partially replaced by copper slag, decreased to some extent. Detailed results have been depicted in the later part of this paper.

Keywords
Slag, Compressive Strength, Fineness Modulus, Sieve Analysis

I. INTRODUCTION
Copper Slag has been procured from two different places in India. One sample has been taken from Sholapur, Maharashtra and the second sample was procured from Kolkata, West Bengal. Sieve analysis has been performed on both the samples and fineness modulus has been found out. The fineness modulus values were found to be different. The main aim behind the sieve analysis was that to find how copper slag blends with the ingredients of concrete and its impact on the compressive strength of concrete. The results pertaining to the compressive strength have been shown in table no. 7 & 8.

II. MATERIALS USED
A. Cement
Ordinary Portland cement of 53 grade with specific gravity of 3.15 has been used. The initial setting time and final setting time were found to be 33min and 315min respectively.
B. Fine Aggregate
Locally available natural river sand passing through 4.75 mm I.S. Sieve with a fineness modulus of 2.74, and water absorption of 1.5% in saturated surface dry (SSD) condition was used. The specific gravity of the sand is found to be 2.63 and was confining to ZONE-III.
C. Natural coarse aggregate
Crushed granite metal from local sources, passing through 20 mm and retained on 4.75 mm sieve was used as natural coarse aggregate. The fineness modulus of Natural Coarse Aggregate (NCA) is 6.56 and its water absorption is 0.94% in SSD condition. The specific gravity of coarse aggregate is found to be 2.71.
D. Water
Potable fresh water available from local sources free from deleterious materials was used for mixing and curing of all the mixes tried in this investigation. W/C ratio is taken as 0.47 for M25 and 0.45 for M30 concrete.
E. Copper Slag
1. It was procured from an industry at Sholapur, Maharashtra. Its specific gravity was found to be 3.79. Bulk density was recorded as 1886 kg/ m3. After sieve analysis the particle size distribution of the copper slag is shown in table 1. The fineness modulus was found to be 4.87.
2. It was procured from Kolkata based industry, West Bengal. Its specific gravity was found to be 3.62. Bulk density was recorded as 1830 kg/ m3. After sieve analysis the particle size distribution of the copper slag is shown in table 2. The fineness modulus was found to be 4.75.
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III. EXPERIMENTAL DETAILS
The specimens 150x150x150 mm cubes were used for the Compression test. Three specimens were tested for the required age and mean value was taken.
Test Results on hardened concrete
These tests were conducted for 28 days and the results were tabulated in tables 7 and 8.
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IV. CONCLUSIONS
From the above graphs and tables, it’s clearly visible that as the fineness modulus of copper slag increases the compressive strength of concrete, in which cement was replaced partially with copper slag, decreases.

References
  1. Antonio M. Ariño and Barzin Mobasher, “Effect of ground copper slag on strength and toughness of cementitious mixes”, ACI Material Journal, 1999, Title No.96-M10.
  2. M. S. Shetty Text book, S. Chand & Company Ltd., 2005.
  3.   Vamsi Pradeep I and Kishore Kumar M, “The Behaviour of Concrete in Terms of Flexural, Tensile and Compressive Strength Properties by Using Copper Slag as Admixture”, International Journal of Engineering and Innovative Technology (IJEIT) VOL. 3, Issue 4, Pages 462-465 October 2013.