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    ASTM C1074 - 19e1

    Standard Practice for Estimating Concrete Strength by the Maturity Method

    Active Standard ASTM C1074 | Developed by Subcommittee: C09.64

    Book of Standards Volume: 04.02

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    Significance and Use

    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, To, 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 To or Q for a specific concrete mixture may be determined using the procedures given in Appendix X1.

    1. Scope

    1.1 This practice provides a procedure for estimating concrete strength by means of the maturity method. The maturity index is expressed either in terms of the temperature-time factor or in terms of the equivalent age at a specified temperature.

    1.2 This practice requires establishing the strength-maturity relationship of the concrete mixture in the laboratory and recording the temperature history of the concrete for which strength is to be estimated.

    1.3 The values stated in SI units are to be regarded as standard for determining the maturity index. No other units of measurement are included for this purpose. There is, however, no restriction on the system of units for expressing strength in developing the strength-maturity relationship.

    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.2)

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C31/C31M Practice for Making and Curing Concrete Test Specimens in the Field

    C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens

    C78/C78M Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)

    C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50mm] Cube Specimens)

    C125 Terminology Relating to Concrete and Concrete Aggregates

    C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory

    C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic Cements and Concretes

    C803/C803M Test Method for Penetration Resistance of Hardened Concrete

    C873/C873M Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds

    C900 Test Method for Pullout Strength of Hardened Concrete

    C918/C918M Test Method for Measuring Early-Age Compressive Strength and Projecting Later-Age Strength

    C1768/C1768M Practice for Accelerated Curing of Concrete Cylinders

    ICS Code

    ICS Number Code 91.100.30 (Concrete and concrete products)

    UNSPSC Code

    UNSPSC Code 30111500(Concrete and mortars)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/C1074-19E01

    Citation Format

    ASTM C1074-19e1, Standard Practice for Estimating Concrete Strength by the Maturity Method, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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