Standard Practice for Estimating Concrete Strength by the Maturity Method

Importancia y uso:

5.1 This practice can be used to estimate the in-place strength of concrete to allow the start of critical construction activities such as: (1) removal of formwork and reshoring; (2) post-tensioning of tendons; (3) termination of cold weather protection; and (4) opening of roadways to traffic.

5.2 This practice can be used to estimate strength of laboratory specimens cured under non-standard temperature conditions.

5.3 The major limitations of the maturity method are: (1) the concrete must be maintained in a condition that permits cement hydration; (2) the method does not take into account the effects of early-age concrete temperature on the long-term strength (see Note 6) (3, 4); and (3) the method needs to be supplemented by other indications of the potential strength of the field concrete.

5.4 The accuracy of the estimated strength depends, in part, on using the appropriate parameters (datum temperature or value of Q) for the maturity functions described in Section 6.

Note 1: Approximate values of the datum temperature, T_o, and the Q-value for use in Eq 1 or Eq 2, respectively, are given in Appendix X2. If maximum accuracy of strength estimation is desired, the appropriate values of T_o or Q for a specific concrete mixture may be determined using the procedures given in Appendix X1.

Subcomité:

C09.64

Referida por:

C0125-21A, C0918_C0918M-20

Volúmen:

04.02

Número ICS:

91.100.30 (Concrete and concrete products)

Palabras clave:

in-place strength; maturity method; nondestructive testing; temperature;