AASHTO T 106:2021 Standard Method of Test for Compressive Strength of Hydraulic Cement Mortar (Using 50-mm or 2-in. Cube Specimens).
This test method covers determination of the compressive strength of hydraulic cement mortar using 50-mm [or 2-in.] cube specimens (see Note I).
Note 1—ASTM C349 provides an alternative procedure for this determination (not to be used for acceptance tests).
This test method covers the application of the test using either inch-pound or SI units. The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system may not be 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 shall be obtained by measurement in SI units or by appropriate conversion, using the Rules for Conversion and Rebounding given in Standard IEEE/ASTM SI 10, of measurements made in other units.
The mortar used consists of one part cement and 2.75 parts of sand proportioned by mass. Portland, air-entraining portland, portland-limestone, or air-entrained portland-limestone cements are mixed at a specified water content. Water content for other cements is that sufficient to obtain a flow of 110 ± 5 in 25 drops of the flow table. Fifty-millimeter [or 2-in.] test cubes are compacted by tamping in two layers. The cubes arc cured 24 h in the molds, and then stripped and immersed in lime water until tested.
This test method provides a means of determining the compressive strength of hydraulic cement and other mortars. and results may be used to determine compliance with specifications. Further, this test method is referenced by numerous other specifications and test methods. Caution must be exercised in using the results of this test method to predict the strength of concretes.AASHTO T 106 pdf download.