AASHTO R 71:16(2020) Standard Practice for Sampling and Amount of Testing of Hydraulic Cement.
1.1. This practice covers procedures for sampling and for the amount of testing of hydraulic cement after it has been manufactured and is ready to be offered for sale.
1.2. The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be the exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. Values in SI units [or inch-pound unitsj shall be obtained by measurement in SI units for inch-pound units] or by appropriate conversion, using the Rules for Conversion and Rounding given in ASTM Standard IEEE/ASTM SIlO. Values are stated in only SI units when inch-pound units are not used in practice.
1.3. The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered requirements of the standard.
4.1. The sampling procedures described are intended for use in the procurement of samples of hydraulic cement after it has been manufactured and is ready to be offered for sale. They are not intended as sampling procedures for quality control purposes during manufacturing. The testing procedures outlined cover the amount of testing to he done and provide guidance for reporting on conformance or nonconformance of cements with requirements of purchase specifications.
4.2. This practice is referenced as the procedure for sampling natural cement (ASTM ClO/CIOM). masonry cement (ASTM C91/C91M), portland cernent(M 85), blended hydraulic cement (M 240M1M 240), expansive hydraulic cement (ASTM C845/C845M), plastic (stucco) cement (ASTM CI 328), mortar cement (ASTM Cl 329), and hydraulic cement (ASTM Cl I 57/C II 57M) based on a performance specification.
4.3. Most building codes and construction specifications require that hydraulic cement to he used in the work meet the applicable requirements of the relevant purchase specifications, such as Specifications M 85. M 240M/M 240, ASTM C91/C9IM, ASTM C845/C845M. ASTM CI 157/Cl 157M, ASTM C1328, and ASTM C1329. If the code or specification requires sampling of the manufactured cement, the provisions given in Section 4.4 are applicable. Not much cement is sold on the basis of such sampling and testing. A useful discussion of sampling and testing cement is contained in ACI 225.1 R.
4.4. The procedures covered in this practice should be done by or for purchasers of hydraulic cement who are using a code or specification that requires sampling and testing to determine if the samples conform to the relevant acceptance specifications. The testing is done using specified methods to determine whether the samples yield test results that conform to the specification, and the tests serve as a basis for acceptance or rejection of the lot of material sampled.
4.5. It is neither intended nor required that all cements be tested using all the test methods referenced in Section 2.
5.1. A cement sample secured from a conveyor, bulk storage, or a bulk shipment in one operation shall be termed a “grab sample.” A sample obtained during a 10-mm interval using an automatic sampling device that continuously samples a cement stream may also be considered a grab sample. Grab samples taken at prescribed intervals over a period of time may be combined to form a “composite sample” representative of the cement produced during that period of time.AASHTO R 71 pdf download.