Standard Test Method for Density and Air Content (Pressure Method) of Freshly Mixed Roller-Compacted Concrete

Importancia y uso:

4.1 The test determines the air content of freshly mixed RCC exclusive of any air that may exist inside voids within aggregate particles. For this reason, it is applicable to concrete made with normal-density or high-density aggregate particles and requires determination of the aggregate correction factor described in Test Method C231/C231M.

4.2 If the concrete being tested contains aggregate that would be retained on a 50 mm (2 in.) sieve, the air content of the total mixture is only approximated by the test.

4.3 The test determines the density of freshly mixed RCC containing aggregate with a maximum size not greater than 50 mm (2 in.).

4.4 The density and air content of hardened RCC may be either higher or lower than that determined by this test method. This depends upon the methods and amount of consolidation effort applied to the RCC from which the hardened concrete specimen is taken; uniformity and stability of the air bubbles in the fresh RCC; accuracy of the microscopic examination, if used; stage in the delivery at which the density and air content of the unhardened RCC are determined; and other factors.

Subcomité:

C09.45

Volúmen:

04.02

Número ICS:

91.100.30 (Concrete and concrete products)

Palabras clave:

air content; calibration; correction factor; density; measuring bowl; meter; pressure; RCC; roller-compacted concrete; unit weight;