MECHANICAL BEHAVIOR OF FIBRE REINFORCED CONCRETE USING COPPER SLAG AS FINE AGGREGATEK. Athiappan, R. Murugasan and J. Daniel Ronald Joseph
Highway concrete pavement construction requires large volume of natural sand as fine aggregate and broken stone pieces as coarse aggregate. Natural sand has become a rare and precious material in India recently due to limited availability. Hence use of industrial waste like copper slag as alternative material for natural sand in concrete pavement construction has good scope of achieving sustainable construction of highway pavements. This paper presents details and results of experimental investigations carried out on crimped steel fibre reinforced pavement quality concrete using copper slag as fine aggregate. The properties studied are workability, compressive strength, flexural strength, split-tensile strength, Impact strength. The main objectives of the this experimental study are (i) to arrive suitable mix proportion for pavement quality concrete (with copper slag as fine aggregate) so as to achieve strength comparable to that of conventional concrete, (ii) to determine the effect of crimped steel fibre dosage and length in affecting the mechanical properties of the above concrete, and (iii) to determine optimum dosage and length of crimped steel fibre. Experimental results indicate that, among 4 fibre dosages (0.5%, 1%, 1.5%, 2.0% by volume of concrete) and 2 fibre lengths (30 mm, 50 mm) considered in this study, 1% dosage of 30 mm length crimped steel fibre enhances the mechanical properties of concrete with 100% use of copper slag as fine aggregate. In general, the results of experimental studies presented in this paper indicate that there is a large scope for using copper slag as 100% substitute material for natural sand in road pavement construction.
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