ISO 1920-4:2020 pdf free download. Testing of concrete — Part 4: Strength of hardened concrete.
ISO 1920-4:2020 specifies procedures for testing the strength of hardened concrete.
2 Normative references
ISO 48-2, Rubber, vulcanized or thermoplastic-Determination of hardness- Part 2 Hardness between 10 IRHD and 100 IRHD.
IS0 679, Cement- Test methods- Determination of strength.
ISO 1920-3, Testing ofconcrete- Part 3: Making and curing test specimens.
ISO 1920-6, festing of concrete- Part 6: Sampling, preparing and testing of concrete cores.
IS0 2781, Rubber, vulcanized or thermoplastic-Determination of densit.
ISO 3310-1, Test sieves-Technical requirements and testing-Part 1: Test sieves of metal wire cloth.
IS0 4662, Rubber, vulcanized or thermoplastic-Determination of rebound resilience.
EN 316, Wood fiberboards- Definition, classification and symboLS.
Specimens that are badly honeycombed and cracked shall not be regarded as being representative of the quality of concrete supplied. In general, standard cube and cylinder specimens should not be tested if they are badly honeycombed as this is an indication of poor specimen making. When such specimens are tested, the test report shall include the fact that the specimen was honeycombed.
Where the designated size, Ii or 12, of the cross-section is outside the tolerances, the specimens may be used for testing by using the actual dimensions; see 4.6.
Where the dimensions or shape of a test specimen exceed the respective tolerances given in ISO 1920-3, the specimen shall be rejected or adjusted (if feasible )by one or more of the following methods:
—uneven surfaces levelled by grinding or by capping,
—the deviation of angles corrected by cutting and/or grinding
the procedures given in Annex B shall be used to adjust the specimen.
Adjustment by grinding shall be the reference method.