#ndt There are numerous situations that can lead to premature structural issues or the degradation of a bridge. For example, tiny stress cracks that aren’t visible to the naked eye could form, and unless caught, could cause a disastrous collapse. Another example might be improperly mixed grout that is used inside the post tension tendons that help hold up a bridge. If the chloride content in the grout mixture is wrong, the high chloride content of the grout can cause the steel cables to corrode prematurely. Infr
Source: NDT