ABSTRACT
The determination of the maximum chloride content in concrete is an important factor in maintaining the reinforced concrete structure from the corrosion of the steel bars. The surface preparation is one of the most critical steps of a liquid penetrant inspection. After cutting the core from the concrete element, process the sample for testing by leveling the surface of the core, and then take the core that has a length not less than 95% of the diameter and not more than double the diameter. The test will be used to identify the concrete compressive strength of the concrete member by using calibration curves of the relationship between reading the concrete hardening and concrete compressive strength. The thickness of the concrete cover is measured in modern construction so as to ensure that the thickness of the concrete cover conforms to the specifications.
