Page - 931 - in Book of Full Papers - Symposium Hydro Engineering

KEYWORDS Roller Compacted Concrete (RCC), Slump, Mix design, Compression strength, Water absorption 1. INTRODUCTION In order to achieve economic self-sufficiency, it is important to control the floods and surface water through the construction of dams which considered essential and infrastructural since water supply has always been a fundamental human need for agriculture, industry and drinking water. In the early 1980s, conventional concrete dam construction methods replaced by the roller compacted concrete method. RCC dams use embankment dams construction’s method, which is based on using heavy equipment machinery. Usage of heavy equipment machinery for constructing concrete dams, leads to development of RCC dams which despite the short construction time, they have the reliability of conventional concrete dams. Also, RCC dams are an economical competitive choice over embankment dams. Construction cost of RCC dams is less than conventional concrete dams as well as embankment dams. It is because of material saving, fast construction, less costly spillway, less risk of coffer dam overtopping and shorter and smaller size of diversion conduit [1]. In addition to economic benefits, the RCC is considered as a ‘‘green” concrete because the cement consumption in the RCC is lower as the RCC mixtures are normally designed with leaner binder content. Mineral admixtures are used extensively in RCC mixtures. The use of large amounts of mineral admixtures improves durability, reduce adiabatic temperature rise of concrete, construction costs, and gas emission accompanied with the manufacturing of cement clinker. Class F and Class C fly ashes, slag, and natural pozzolan have been used as mineral admixtures in the RCC [2]. Coarse aggregate size has a significant influence on the degree of RCC compaction in small layers and less effect in relatively thicker layers especially when large vibratory rollers are employed. The coarse aggregates with maximum- size diameter greater than 76 mm are seldom used in the RCC manufacturing because they cause problems in the layers spreading and compaction. However, the use of coarse aggregates with maximum-size diameter finer than 75 mm reduces the volume of voids and produces more cohesive mixture [3]. Waste coking and iron ore concentrate plant, which is not reusable, is normally deposit causing obvious environmental problems; so use of these materials effectively in concrete, make them valorized. A mass of small particle also produced due to the process of iron ore concentrate production, which usually does not have the ability to become concentrate, and is deposit. The waste Coke, consisting of non-consumable materials commonly used in particles smaller than 1 cm in diameter, are discharged as waste and disposed of in garbage dumps. 931