Over time, many buildings and structures are exposed to defects such as corrosion of reinforcing steel in different parts of the concrete structure, so it is necessary to repair them directly in order to maintain the sustainability of these structures. The corrosion of steel reinforcement is one of the main causes of premature deterioration, which reduces service life in reinforced concrete structures. This increases the maintenance and repair costs of reinforced concrete structures. In reinforced concrete structures corrosion of steel in a normal state is a very slow process. Accelerated corrosion techniques are generally used in the laboratory to simulate natural corrosion. The aim of this research is to study the protection of reinforcing steel in the concrete from corrosion using accelerated corrosion methods. The objective of this study is to analyze the protection of steel reinforcement in concrete from corrosion using zinc and its effects on steel samples. In this study two types of reinforcing steel (mild & tor steel) are used and each type of steel is coated with protective paint. Mix design was done using ACI method for C30 grade of concrete and four slab samples (300mm × 300mm × 40mm) were cast with steel rebar. In this research a constant current of 0.8 ampere was applied on the steel bar and the reduction in weight of steel bar before and after corrosion was observed. The results show that samples with coating undergoes less corrosion compared to samples without coating in both mild steel and tor steel specimen.

Agglomeration is derived by clustering of firms that contributes to the generation of centers in urban areas or in areas of vibrant economic activities. Doha as a city has witnessed clustering of several industrial activities in different locations since the beginning of the industrial development of the state and the discovery of hydrocarbons. Today, Doha Industrial Area is becoming a major zone that is growing as a result of agglomeration as well as the effective private sector’s participation in the running of small-to-medium industrial activity, managed by the government. This research study explores the role of agglomeration in the clustering of industries and its economic impact on the city based on the theory of agglomeration economies. Considering the land use of the studied industrial area, its accessibility, location and other urban considerations, Doha Industrial Area, namely zone 57, is explored as an exemplar case to offer an understanding of agglomeration of industry clusters in the context of Doha. The research is shedding light on the role of active governance in the distribution of land use within the studied zone. Further analysis of establishment types, areas and spatial distribution within the zone provides impressive remarks on the role of agglomeration in the creation of specialized cities to enhance the private sectors’ role in the process of economic growth and urban development.