Journal of Environmental Treatment Techniques 2015, Volume 3, Issue 3, Pages: 158-162 158 Application of Iron Slag at Different Pavement Layers Zolfaghar Zarei, Mohammad Reza Baradaran * Department of Civil Engineering, Firoozabad Branch, Meymand Center, Islamic Azad University, Meymand, Iran. Received: 16/07/2015 Accepted: 06/09/2015 Published: 30/06/2015 Abstract Reusing waste material in the past decade has got too importance and the reason is emphasizing on environment laws and reducing the pollution of industrial garbage. Steel-making operations has faced with this problem because of producing a large amount of waste material during production which in the case of steel industries ability to recover and using this products, these products create many problems in terms of pollution for environment with regard to their high production volume including slag, dust, sludge, shell sheets and oxide layers in which slag has got the most importance than others because of high production rate. Nowadays, broad research has performed in the world to recycling these side products which have resulted to solutions to recover them. In Iran with regard to the increasing of steel and slag production, research on them and appropriate solutions to use in different applications and reducing environmental pollution seems necessary. This paper addresses the investigation of iron slag at different pavement layers and the influences like frictional resistance, track disruption and bearing strength that it produces. Key words: Iron slag, frictional resistance, track disruption. 1 Introduction 1 Slag is a molten material which is created due to interaction of molten materials, limestone, fuel and existing oxide impurities in metal. During these interactions, the impurities that mustn’t be in cast iron will be separated from pig iron. Steel slag (iron) is side product during production and steel manufacturing. This product is created in one of the three types, fire furnace, basic-oxygen furnace or electric arc furnace. This product is different from tall furnace slag which is a product during iron making process production in terms of chemical properties [3]. The produced slag from steel making furnaces is usually cooled by free air and a solid stony material will be created which is similar with basalt in appearance. Basic-oxygen steel slag and electric arc furnace slag both have similar chemical and physical properties. Chemical composition of blast furnace slags changes with regard to steel making method and the quality of produced steel [4]. The positive characteristics of blast furnace include [4]: 1- Resistance and high stability against impact 2- The excellent angular shape of aggregate which creates appropriate internal friction angle 3- High resistance against load, pressure and abrasion 4- High sliding resistance because of frictional strength among aggregates 5- Bitumen absorption percentage due to high alkali property The mean of physical properties of blast furnace slags, tall furnace slags and basalt stone are shown in Table 1 [4]. Corresponding author: Mohammad Reza Baradaran, Department of Civil Engineering, Firoozabad Branch, Meymand Center, Islamic Azad University, Meymand, Iran. E-mail: mohamadrezabaradaran@gmail.com 2 Application of Blast Furnace Slag in Road Surface Surface layer in road pavement is a layer of high-grade gender and rather with high strength that is located directly in contact with vehicles. Surface layer in the high traffic roads is made by high grade materials such as asphalt concrete or cement concrete. Table 1: Average of physical properties Specifications Iron slag Tall furnace slag Basalt stone BOS Slag EAF Slag Density of materials (Kg/m 3 ) 3400 3400 2600-2500 2850 Actual density (Kg/m 3 ) 1700 1700 1300-1200 1520 Resistance in dry condition (KN) 250 275 100-85 350 Resistance in wet conditions (KN) 230 240 90-65 - Losanjeles resistance 13-15 13-15 43-37 13 sliding resistance 58 62 50 55-50 Relent 15 20 - 12 Impact resistant 12 14 - 12 Ductility factor 11 6 - 28 Water absorb 0.9 0.5 - 1.9 pH 11 11 - 0.9 The improvement of surface performance in different climate conditions and long-time heavy traffic has been the main purpose of pavement designers and road-construction engineers. Hence to improve the status of roads surface in terms of friction and strength increase against other destructions, various materials have been investigated in Journal web link: http://www.jett.dormaj.com J. Environ. Treat. Tech. ISSN: 2309-1185