The International Journal of Engineering and Science (IJES) || Volume || 7 || Issue || 3 Ver. II || Pages || PP 64-72 || 2018 || ISSN (e): 2319 – 1813 ISSN (p): 23-19 – 1805 DOI:10.9790/1813-0703026472 www.theijes.com Page 64 Evaluation of the Performance of Brick Dust as a Filler Material for Hot Asphalt Mix Design: A Case Study in Jimma Zone Fisseha Wagaw 1 , Prof. Emer Tucay Quezon 2 , Anteneh Geremew 3 1 Graduated MSc in Highway Engineering, Faculty of Civil and Environmental Engineering, Jimma Institute of Technology, Jimma University, Jimma, Ethiopia 2 Professor, Institute of Technology, Ambo University; and Guest Lecturer, Jimma Institute of Technology, Jimma University, Jimma, Ethiopia 3 Senior Lecturer, Faculty of Civil and Environmental Engineering, Jimma Institute of Technology, Jimma University, Jimma, Ethiopia Corresponding Author: Fisseha Wagaw --------------------------------------------------------ABSTRACT---------------------------------------------------------------- A bituminous paving mixture is a mixture of coarse aggregate, fine aggregate, and bitumen mixed in suitable proportion to result in the strong and durable mix in order to withstand traffic load. In this paving mix, ordinary stone dust, and cement used as filler material. One of the main problems in the construction of bituminous paving mixture is the insufficient amount of filler from crushing stone aggregate, and cement supply is low. A study has been carried out in this research to explore the use of Brick dust as filler material for the bituminous mixture. The objective is intended to evaluate the performance of brick dust as fillers in Hot Asphalt Mix design, according to the test procedure specified by ASTM. Several specimens of hot asphalt mixture were prepared according to ASTM D 1559 using an aggregate blend with brick filler and aggregate blend without brick filler. The aggregate blending made by using Job mix formula to obtain the percentage of mixed material. For aggregate blended without brick G-1 32%, G-2 23%, and G-3 45% for Aggregate blended with brick filler G-1 30%, G-2 18%, G-3 45% and G-4 7%; where G-1 Coarse Aggregate 3/4, G-2 Coarse Aggregate 3/8, G-3 Fine Aggregate, and G-4 brick filler. It concluded that the results of the Marshall test of mix design showed satisfactory when hot asphalt mixed with these brick fillers. The Specimens blended with brick filler lead in produce asphalt mixture with higher Marshall stability, lower flow, a less void filled with asphalt. Hence, brick dust can replace stone dust and cement filler in the bituminous paving mix. It is recommended to use brick dust as filler material in a bituminous paving mix may save considerable investment; as well as reliable performance of the in-service highway can be achieved. Keywords: Aggregates, Brick Filler, Bituminous paving mix, Hot Mix Asphalt, Marshall Mix Design, Optimum Asphalt Content. --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 12-03-2018 Date of acceptance: 27-03-2018 --------------------------------------------------------------------------------------------------------------------------------------- I. INTRODUCTION Construction of highway involves a huge outlay of investment. A precise engineering design may save considerable investment as well a reliable performance of the in-service highway can be achieved. Two things are of major considerations in flexible pavement engineering; pavement design and the mix design. The present study is related to the mix design considerations. A mix designer tries to achieve these requirements through some tests on the mix with different proportions and finalizes with the best one [1]. The road usually shows excessive failures at an early stage of the pavement life. A primary procedure in the improvement of the existing performance of roads starts with modification of mix design. The strength, cost, and stability of asphalt mixtures are influenced by several features together with a gradation of aggregated and types and amount of filler materials. The filler plays a major role in the properties and behavior of bituminous paving mixtures [2]. The mechanical properties of bituminous road pavement depend decisively upon the properties of its filler- bitumen [3]. For modification of asphalt paving materials, the high-quality additives are quite expensive for the mass production of bituminous mixtures, a solution to this problem can be obtained by considering the influence of natural mixture ingredients, such as filler [2]. Mineral fillers were originally added to the dense- graded HMA paving mixtures to fill the voids in the aggregate skeleton and to reduce the voids in the mixture [4]. The filler used in the asphalt mixture is known to affect the mix design, especially the optimum asphalt content. Fillers not only fill voids in the coarse and fine aggregates but also affect the aging characteristics of the mix. The aggregate materials those are finer than 75μm in size is referred to as filler. The use and the application of mineral filler in asphalt mixtures are intended to improve the properties of the binder by reducing the binder's inherent temperature susceptibility [2]. The filler theory assumes that "the filler serves to fill voids