Water mains rehabilitation projects' budget allocation is considered the most important challenge that faces the engineers and the decision maker in governments and municipalities, especially when it is limited. This paper presents a methodology for water mains rehabilitation projects' budget allocation. The proposed methodology consists of two models: (1) the grade classification model; and (2) the project ranking model. The grade classification model uses significant sustainability development criteria such as: economic; social; and environmental criteria. The main function of the grade classification model is to classify the projects into five grade level (lowest, low, medium, high, and very high), whereas, the main function of the project ranking model is to rank the projects at the same level in descending order according to their weighted scoring value. A factor's numerical grade scales have been established to adjust the factor's scoring in the project ranking model. Simos' procedure is integrated with the scoring factors model to develop the grade classification model. A numerical example is provided to demonstrate the proposed methodology.
The reinforced concrete assets such as bridges, tunnels, administration buildings, schools and the residential buildings are important factors in the Egyptian economy. Several researches have been made in the field of concrete defects and methods of repair. Concrete can deteriorate for a variety of reasons such as the corrosion of steel bars, design errors, construction errors and the environmental conditions. Concrete structures' deterioration is often the result of a combination of deterioration factors. Factors that contribute to the deterioration of the reinforced concrete structures can be classified into five categories as follows: (1) Design factors such as the code requirements, the structural system, and the foundation design; (2) construction factors such as the mix design and the quality control; (3) protection factors such as the thermal insulation and the water proofing; (4) material factors such as the aggregate and the cement; and (5) the applied loads factors such as the chemicals and the earthquakes. This paper provides a model for prioritizing the concrete structures' repair works. Past researches have been reviewed to gather the main factors that contribute to the deterioration of concrete structures. Interviews with senior engineers have been conducted during the development of the proposed model. A numerical example has been presented to demonstrate the proposed model.
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