RECYCLING AGGREGATE WASTE-PRODUCT FOR SUSTAINABLE CONCRETE MANUFACTURE Shahid KABIR Associate Prof., Dept. of Civil Engineering, College of Engineering, King Faisal University, Al Ahsa, Kingdom of Saudi Arabia Ammar AL-SHAYEB Lecturer, Dept. of Civil Engineering, College of Engineering, King Faisal University, Al Ahsa, Kingdom of Saudi Arabia Feras F. AL-MANSOUR, Waleed H. AL-RWELY, Majed A. AL-HUSSAIN Undergraduate Students, Dept. of Civil Engineering, College of Engineering, King Faisal University, Al Ahsa, Kingdom of Saudi Arabia ABSTRACT: The source of the waste product used in this study is from an asphalt and ready-mix concrete plant; the waste has a very fine particle size and is disposed on site, which can be the cause of environmental hazards. An experimental program was conducted, in which the AWP was processed to obtain a particle size of 0.075 mm. Along with control samples of high strength concrete, many specimens were fabricated at various levels of cement replacement: 5%, 10%, and 15% in order to assess the physical and mechanical properties of the concrete through compressive strength, split tensile strength and pulse velocity tests. Furthermore, samples with fly ash at various cement replacement levels were produced for comparison purposes. Concrete manufactured using this aggregate waste product (AWP) demonstrated promising results for sustainable concrete manufacture. Keywords: Aggregate waste product (AWP), Sustainable Concrete Manufacture, environmental hazards 1. INTRODUCTION Sustainability consists of three components, environment, economy, and society, which must remain healthy and balanced in order to meet the goals of sustainable development. As the environment has increasingly become the most important component, sustainability has come to be synonymous with environmentally friendly and “green.” With the rapid development of the global economy, the process of urbanization has also accelerated. The Kingdom of Saudi Arabia has set into motion a plan to spend US $35 billion on construction for infrastructure and public sector building programs in order to urbanize its economic cities with a view to making the country one of the world’s top ten competitive investment destinations in the near future. Plans include building new factories, schools, doubling desalination capacity, and increasing electrical generation and distribution [1]. This has resulted in an increasing need for construction materials and the management of corresponding construction wastes. The most popular construction and building material in the world is concrete [2]; a typical concrete formulation contains a large amount of aggregate, a moderate amount of cement and water, and a small amount of admixture. The aggregates are usually mined, separated into various size fractions, and crushed and reconstituted in order to satisfy grading requirements [3]. Fig. 1 (a) AWP Collection Fig. 1 (b) Stockpile AWP Fig. 1 Aggregate Waste Product (AWP)