AASHTO M 302:2018 Standard Specification for Slag Cement for Use in Concrete and Mortars.
9.1. The following sampling and testing procedures shall be used by the purchaser to verify compliance with this specification.
9.2. Take random grab samples either from a delivery unit or at some point in the loading or unloading process so that no sample represents more than 115 Mg (125 tons) (Note 4). If samples are taken from rail cars or trucks, take at least two separate 2-kg (5-ib) portions and thoroughly mix them to obtain a test sample (Note 5). Sample by removing approximately a 300-mm (12-in.) layer of slag cement. Make a hole before obtaining a sample to avoid dust collector material that may be discharged into the delivery unit after the slag cement flow ceases. Sample at a rate of ten samples per month or one sample for each 2300 Mg (2500 tons) of shipments, whichever is more frequent. Note 4—Standard statistical procedures are recommended for ensuring that samples are selected by a random procedure: see ASTM D3665. These procedures can he used to select the days within a month or within a week that samples will be taken. The delivery unit or time of day then should be chosen randomly.
Note 5—The quantity of sample spcciticd is more than adequate for the testing required. A 2-kg (5-Ib) portion should be retained in a sealed container for retesting if that is considered necessary to verify compliance.
1 0.1 . Slag—A clivitv Tests with Portland Cement:
10.1 .1. Slag cement activity shall be evaluated by determining the compressive strength of both portland- cement mortars and corresponding mortars made with the same mass of blend that is 50 percent slag cement and 50 percent portland cement by mass.
Note 6—Appendix XI discusses the effects of cement, temperature, and amount of slag cement used on performance with portland cement.
10.1.2. Refrrence cement—The portland cement used in the slag cement activity tests shall comply with the standard chemical and physical requirements of M 85, Type I or Type II. with the additional requirements of total alkali content and compressive strength limits as shown in Table 3. Sufficient cement shall be reserved to avoid changing reference cement more often than every 2 months. Following the compressive strength requirement of Table 3, the referenced cement shall be rcqualified at intervals no greater than 6 months.
Note 7—Different reference cements may produce different Slag Cement Activity Index results. Reference portland cement meeting the requirements of Section 10. 1.2 is available from CCRL.AASHTO M 302pdf download.