ASTM C1202:2017a pdf free download – Standard Test Method for Electrical Indication of Concrete’s Ability to Resist Chloride lon Penetration.
Note 5—The maximum allowable aggregate size has not been established for this test. Users have indicated thai test repeatability is satisfactory on specimens from the same concrete batch for aggregates up to 25.0 mm nominal maximum size.
8.2 When results of this test method are used for evaluation of materials or mixture proportions based on cast specimens for purposes of quality control, mixture submittals, or acceptance of concrete, prepare at least two 100-mm diameter cylindrical specimens in accordance with Practice C192/C192M for concrete mixtures prepared in the laboratory or Practice C31/ C31M from samples of fresh concrete obtained in the field. Moist cure specimens in accordance with 8.2.1 for concrete mixtures containing only portland cement. For concrete mixtures containing supplementary cementitious materials use extended moist curing in accordance with 8.2.2 (see Note 6) unless the accelerated moist curing method of 8.2.3 is specified (see Note 7). Alternatives to these curing methods and durations are permitted when specified. Use the same method and duration of curing for preparing mixture submittals. for subsequent acceptance testing, and for comparing two or more ii ix ture s.
8.2.1 Moist Curing—Cure test specimens for 28 days in accordance with Practice C192/C192M or in accordance with the standard curing procedure of Practice C3l/C3lM for specimens prepared in the field.
8.2.2 Extended Moist Curing—Cure test specimens br 56 days in accordance with Practice C192/C192M for specimens prepared in the laboratory or in accordance with the standard curing procedure of Practice C31/C3IM for specimens prepared in the field.
8.2.3 Accelerated Moist Curing—Provide 7 days of moist curing in accordance with Practice C 192/C I 92M for specimens prepared in the laboratory or in accordance with the standard curing procedure of Practice C31/C3IM for specimens prepared in the field. After 7 days of moist curing, immerse the specimens for 2 1 days in lime-saturated water at 38.0 ± 2.0 °C.
NOTE 6—The 56-day moist curing period is to allow for some supplementary ccmentitious materials to develop potential properties because of their slower rate of hydration. Concrete containing supplementary cementitious ma(erials may continue to show reductions in results of this test beyond 56 days. and in some cases, it may be appropriate to test at later ages. such as 3 months.
Note 7—The accelerated moist curing procedure has been found useful in providing an earlier indication of potential property development with slower hydrating supplementary cemenhitious materials (7). Because the two diticrent curing methods may not provide the same results, the specifier of the test may require a correlation between results for extended moist cured and accelerated moist cured specimens and establish appropriate acceptance criteria when the accelerated moist curing procedure is used or permitted. Comparisons between results of moist cured specimens and field performance of concrete are documented in (8).
8.3 Transport the cores to the laboratory in sealed (tied) plastic bags. If specimens must be shipped. they should be packed so as to be properly protected from freezing and from damage in transit or storage.