ASTM C270-19ae1 PDF Download

The ASTM C270-19ae1 standard covers the requirements for mortars used in the construction of unit masonry structures, both reinforced and non-reinforced. The standard provides specifications for four types of mortar, which are categorized into two alternative specifications: proportion specifications and property specifications.

The proportion specifications determine the proportions of different ingredients in the mortar mix, while the property specifications require the mortar to have specific flow properties when tested in the laboratory. If neither proportion nor property specifications are specified, the proportion specifications will govern, unless data is provided and accepted by the specifier to demonstrate compliance with the property specifications. It is important to note that this standard does not cover the determination of mortar strengths through field testing.

The standard emphasizes that the compressive strength values obtained from field tested mortars do not represent the laboratory-tested compressive strength or the strength of the mortar in the wall. Physical properties of field sampled mortar should not be used to determine compliance with the standard or as criteria for acceptance or rejection of the mortar. Compliance with the standard requires verifying that the materials used meet the specified requirements and are added to the mixer in the correct proportions.

The standard also includes explanatory notes and footnotes, which provide additional information and clarification. However, these notes and footnotes should not be considered as requirements of the standard. Terminologies used in the specification are identified in Terminologies C1180 and C1232.