ASTM C928/C928M-20.Standard Specification for Packaged, Dry, Rapid-Hardening Cementitious Materials for Concrete Repairs.Now you can download ASTM C928/C928M-20 pdf.
This specification covers packaged, dry, cementitious mortar or concrete materials for rapid repairs to hardened hydraulic-cement concrete pavements and structures. Materials that contain organic compounds, such as bitumens, epoxy resins, and polymers, as the principal binder are not included.
7. Sampling
7. I A lot is the quantity of packaged repair material normally placed on a pallet. In general. this quantity will weigh from 9(X) to 18(X) kg 120(X) to 40(H) IbI.
7.2 A unIt sample is a single package of material randomly selected from the lot.
8. Spccirnen Preparation
8. 1 (‘oiicreie Mechanically mix the packaged dry concrete material with mixing liquid. Determine the properties of the unhardened mixture, and mold and cure the specimens in accordance with Practice C 192/C I 92M or mtxiiticauons as outlined herein.
8.1.1 The sample of packaged dry material shall be any combination of whole packages yielding not less than 20 L &1 of hardened material.
8.1.2 Hase the quantity of water, other liquid component. or both added to the sample on the quantity per bag stated in the directions for use.
8.1.3 Place the sample in the mixing machine and add the required amount of liquid. Start mixing immediately. Continue mixing for the length of time indicated in the directions for use.
9. Test Methods
9. I MaiiifrstIv Faulty Specimens—Treat man i lest ly faulty specimens in accordance with the corresponding section in Specification C494/C494M.
9.2 Compressive Strength—Prepare and test three test specimens for each age of test and each level of mixing temperature. Test in accordance with Test Method C39/C39M for concrete and Test Method C109/C109M for mortar.
9.3 Length C’hange—Prepare and test three specimens (set) in accordance with Test Method C157/C157M. except as modified by this section and &3. The molds for casting test specimens and the length comparator shall comply with the requirements of Practice C390/C40M.