The results indicated that the rate of chemical reactions are not the same for the acids which they have different concentrations. It has been adopted to make holes in concrete cubes before submerging them with acid solutions to determine the penetration and chemical reaction rate by observation, all the solutions where ready to be poured in the holes using 2 cubes of concrete for each of the 8 solution which have different concentrations of acids. The types of acids used in this research are Nitric, Sulfuric and Hydrochloric acids. In this study, the effect of three types of acids on the concrete properties, the corrosion progresses, chemical reaction rate and the penetration of the acid to the concrete were tested. With the increase of environmental damage, especially in the Arab region as a result of wars in the past years and the destruction of infrastructure, engineers are concentrating more on reducing adverse environmental influences. Demolition is the deliberate destruction of structures and materials by means of explosives, mechanical devices, fire, chemical agent, etc. The important methods practiced in this field are mentioned. The demolition technology that is practiced to demolish the concrete structures in a controlled way especially in Indian conditions. The application of method for demolition depends upon actual site condition and available space. Before execution of demolition work, the careful study of site condition, the type of structure, structural member, demolition range, rural or urban area and frequency.
The demolition method also varies with the time available for demolition and need of site clearance for the new structure. Today various kinds of demolition methods are available, but the method of implementation for demolition work varies with the site condition, safety and cost. Any kind of demolition work needs labor forces for executing the work. In developed countries demolition is very essential for development of new structures for various residential and industrial purposes. During this life, structures often meet with some situations like disasters, changing functions, city reconstruction, or higher residence demand due to population, all these lead to demolition or reconstruction of existing structures. The life cycle of concrete structures is usually 40 to 90 years.