AS 1012.20:1992 PDF Download

AS 1012.20:1992 is a standard that outlines the procedure for determining the chloride and sulfate content in hardened concrete and concrete aggregates. The method involves obtaining solutions from the sample, which can also be used to determine the acid-soluble calcium oxide content. This standard is particularly useful because it allows for the detection and measurement of easily oxidizable sulfide content, which can be detrimental to concrete. By limiting the inclusion of such sulfides in concrete and concrete aggregates, the method helps ensure the quality and durability of the material.

It is important to note that complying with the relevant requirements specified in AS 3600 may require additional tests and calculations. The standard also mentions that separate test methods are available for analyzing other concrete-making materials, such as cementitious materials, admixtures, and water. It highlights the importance of sampling technique, as gross variations in chloride and sulfate content can occur even over small distances. Factors such as rainwater leaching, surface evaporation, crusting, and penetration of salt and groundwater can affect the results. Additionally, the quantity of water used during coring should be limited, as it can have a significant impact on the outcome.