What is the primary function of a pachometer in bridge inspection?

The primary function of a pachometer in bridge inspection is to determine the position of reinforcement within concrete structures. This is crucial for evaluating the structural integrity and understanding the overall condition of a bridge. Knowing the location of reinforcement bars helps inspectors assess areas of potential weakness and plan for any necessary repairs or reinforcements.

Pachometers work by using electromagnetic principles to locate and measure the density of metal reinforcement within the concrete. This information is important because it allows bridge inspectors to identify areas where corrosion or damage may have occurred, enabling more effective assessments and maintenance decisions.

The other functions listed in the question, such as detecting decay in timber, measuring the thickness of asphalt, and checking moisture content, are not the primary focus of a pachometer. Instead, specialized tools and methods are typically used for those tasks. Understanding the specific role of a pachometer helps bridge inspectors effectively identify and evaluate crucial aspects of bridge safety and integrity.