Technical differences between repair options

Different repair options are suitable for different applications, however, these overlap to such an extent that a clear methodology for making a decision on technical or cost grounds is difficult as each structure and type of structure is different. What is acceptable on a bridge deck is not applicable and acceptable on a substructure or a building. Costs of access vary widely as do the implication of noise, vibration and dust. 

A simplified table of technical issues that may exclude some repair options is also given later. This lists some issues such as the design of the structure and other problems that may eliminate certain options or may severely increase the cost of using them. 

Chapter 9 will discuss how we can evaluate the current condition, develop a condition index and extrapolate forwards and backwards to predict future deterioration. 

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