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This document contains the requirements related to the non destructive testing (NDT) of highways structures. Typical uses of NDT for highway structures are as follows:
1) gaining increased assurance as to the quality of new construction such as weld testing of steelwork;
2) gaining increased assurance as to the integrity of earlier construction where similar types of construction have been shown to be defective, such as detecting voids in post-tensioned concrete;
3) providing an indication of the possible internal structure of old bridges for assessment purposes, such as the structural form of masonry arches;
4) providing supplementary indications of the condition of structures which are showing signs of distress, such as the degree of contamination and corrosion of reinforced concrete bridges exposed to chloride attack; and, 5) recording acoustic emissions from bearings exhibiting cracking or excessive friction or from bedding to bearings undergoing cracking.
The expert interpretation of NDT results can be of assistance with structural appraisal.