International Journal of Scientific & Engineering Research, Volume 5, Issue 10, October-2014 1257 ISSN 2229-5518 IJSER © 2014 http://www.ijser.org Performance of Carbon Steel- Polypropylene Fiber Reinforced Self Compacting Concrete K J Sagar, Dr. K. B. Parikh ABSTRACT: The effect of carbon steel fibers and polypropylene fibers in self compacting concrete was studied in this paper. The self compacting concrete is a concrete that can be placed and compacted by its own weight. Self compacting concrete provides several economic and technical benefits and the use of fibers in self compacting concrete extents its possibility. Various researchers were performed the slump flow test, compressive strength test and flexural strength test to study the effect of fibers on fresh and harden properties of self compacting concrete. Polypropylene – carbon steel fiber reinforces self compacting concrete shows 29.36 % increase in compressive strength when compared to the control mix because it obtain benefits from both fibers. Maximum flexure strength with the use of both fibers in self compacting concrete can be achieved at 0.1 % use of polypropylene fibers and 1.0% carbon steel fibers as 71.58 %. KEYWORDS: self compacting concrete, carbon steel fibers, polypropylene fibers, workability, compressive strength, flexure strength. ——————————  —————————— INTRODUCTION: self compacting concrete is considered as a concrete that can be placed and compacted by its self weight and at the same time it is cohesive enough to be handled without segregation and bleeding. It can fill all the formworks even in congested reinforcement with little or no vibration effort. The self compacting concrete is first introduced in the late 1980’s from Japan. There are many advantages of self compacting concrete. SCC can place faster than normal concrete that’s why it reduces the cost of placing of concrete. It improves the finish of surface in architectural point of view. The time period of construction can be reduced by use of SCC. Due to reduction in construction time period, it reduces the cost of construction. There are two types of fibers are used in this study: carbon steel fibers and polypropylene fibers. Carbon steel fiber is different than normal steel fibers. The base material of carbon steel fiber is carbon steel wire whereas in normal steel fiber base material is cast iron wire. The tensile strength of carbon steel fiber is two to three times more than that of normal steel fibers. Carbon steel fibers increase the compressive strength, flexure strength and tensile strength of concrete. Whereas polypropylene fibers act as a bridge to retard cracks and crack propagation. MATERIALS USED IN THESE WORKS: Cement: ordinary Portland cement 53 grade and specific gravity 3.15 is used in my works. Fly ash: Fly Ash is available in dry powder form. It is procure from thermal power stations in balasinor, Gujarat. The light gray in color. Fine Aggregate: I use locally available river sand from himatnagar conforming in Indian standard (is 383) specific gravity 2.64. Coarse Aggregate: Locally available quarry stone in good strength, passing through a 12.5 mm and retain in 10mm sieve, specific gravity 2.68. Water: Ordinary portable water without acidity and Alkanet available in well or pump. Super Plasticizer: CONTECH CONFLOW SP is used to reduce the frictional properties of concrete. Polypropylene fibers: polypropylene fibers of 12 mm length are used in my work and my purchase from fiber zone Ahmadabad. Carbon steel fibers: carbon steel fibers of 35mm in length and 0.5mm in diameter and hooked at the end are used in my works. Carbon steel fiber: Carbon steel fiber is a metallic fiber, which provides good compressive strength and flexure strength to the concrete. It passes two to three times higher tensile strength in comparison to the normal steel fiber. There are three types of carbon steel fibers: hooked end fiber, straight fibers and zigzag shaped fiber based on its shape. I used hooked end carbon steel fiber of 0.5 mm diameter and 35 mm length in this study. The aspect ratio of fiber is 70 mm. Table 1 properties of carbon steel fibers. Chemical composition Details Physical properties Details IJSER