ASTM WK46291

    Revision of C942 - 10 Standard Test Method for Compressive Strength of Grouts for Preplaced-Aggregate Concrete in the Laboratory

    (What is a Work Item?)

    Active Standard: C942 - 10

    Developed by Subcommittee: C09.41 | Committee C09 | Contact Staff Manager



    WK46291

    1. Rationale

    Currently C942 states 10.1 Determine the consistency of grout as follows: 10.1.1 Use the flow cone, Test Method C939, for grout to be used for PA concrete or whenever the consistency is less than 35 s. 10.1.2 For grouts at consistencies thicker than above, determine the consistency on the flow table, Test Method C109/ C109M, using 5 drops of the table in 3 s. When placing grout in the mold, puddle each layer five times with the gloved finger. 10.2 Measure the temperature of the grout. 10.3 Mold sets of cube specimens for testing in compression. 10.3.1 A three-gang cube mold shall constitute one test set.Provide at least one test set for each age at which the strength is to be determined, but not less than two sets. 10.3.2 Fill each mold in the set halfway. Puddle each with a gloved finger five times to release entrapped air. Fill the mold and puddle again. Bring the excess grout to the center and finish the surface by cutting off the excess with the straight edge of a trowel held vertically and drawn across the top of the mold with a sawing motion. 10.3.3 Place the cover plate over the mold (three-gang),taking care that the grout or loose grains of sand do not prevent seating of the plate. 10.3.4 Place a mass of 7 kg (or 15 lb) on each cover plate or fix the cover plates to the molds with C-clamps, finger tightened. It is desired to harmonize this language with that of ASTM C1107 which states 11.5.1 For fluid or flowable grouts, fill each mold in the set halfway. Puddle each with a gloved finger five times to consolidate. Fill the mold and puddle again. When filling the mold, use sufficient material so that after the final consolidation the mold is slightly overfilled. Bring the excess grout to the center and finish the surface by cutting off the excess with the straight edge of a trowel held vertically and drawn across the top of the mold with a sawing motion. Plastic grouts shall be consolidated as described in Test Method C109/C109M. 11.5.2 Cover the cube molds with a cover plate, taking care that the grout does not prevent seating of the plate. The cover plate shall be flat, rigid, nonreactive and not less than 6 mm [14 in.] thick. The cover plate shall overlap the cube mold by not less than 6 mm [14 in.]. The cube mold shall be level and the cover plate shall be restrained so that contact is maintained between the upper surface of the cube mold and cover plate. NOTE 6Known methods of providing restraint include the use of two C clamps, a mass of at least 7 kg [15 lb], and wing nuts attached to studs between the cube mold base and cover plate.


    Keywords


    Citing ASTM Standards
    Back to Top
    Work Item Status

    Date Initiated:
    05-28-2014

    Technical Contact:
    Fred Goodwin

    Status:
    Draft Under Development