ASTM C1202-17a pdf free download.Standard Test Method for Electrical Indication of Concrete's Abiity to Resist Chloride lon Penetration.
1.1 This test method covers the determination of the electrical conductance of concrete to provide a rapid indication of its resistance to the penetration of chloride ions. This test method is applicable to types of concrete where correlations have been established between this test procedure and long- term chloride ponding procedures such as those described in AASHTO T 259. Examples of such correlations are discussed in Rcfs 15.2
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement arc included in this standard.
1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
3. Summary of Test Method
3.1 This test method consists of monitoring the amount of electrical current passed through 50-mm thick slices of 100-mm nominal diameter cores or cylinders during a 6-h period. A potential difference of 60 V dc is maintained across the ends of the specimen, one of which is immersed in a sodium chloride solution, the other in a sodium hydroxide solution. The total charge passed, in coulomhs, has been found to he related to the resistance of the specimen to chloride ion penetration.
4. Significance and Use
4.1 This test method covers the laboratory evaluation of the electrical conductance of concrete samples to provide a rapid indication of their resistance to chloride ion penetration. In most cases the electrical conductance results have shown good correlation with chloride ponding tests, such as AASHTO T259, on companion slabs cast from the same concrete mixtures (Refs 1-5).
4.2 This test method is suitable for evaluation of materials and material proportions for design U()SCS and research and development.
4.3 Sample age has significant effects on the test results, depending on the type of concrete and the curing procedure. Most concretes, if properly cured, become progressively and significantly less permeable with time.
4.4 This test method was developed originally for evaluations of alternative materials, hut in practice its use has evolved to applications such as quality control and acceptance testing. Factors such as ingrcdient materials used in concrete mixtures and the method and duration of curing test specimens affect the results of this test (Sec Note I). When this method is used for mixture qualification and acceptance testing, it is imperative that the curing procedures and the age at time of testing be clearly specified.ASTM C1202 pdf download.