ASTM C144-18 PDF Download

The ASTM C144-18 standard provides guidelines for the quality and composition of aggregates used in masonry mortar. The standard specifies that the aggregate for masonry mortar can either be natural sand or manufactured sand. Manufactured sand is produced by crushing stone, gravel, or air-cooled iron blast-furnace slag, and it undergoes a specialized processing method to ensure suitable gradation.

The standard defines the requirements for grading of the aggregate, ensuring that it falls within the specified limits. Additionally, it sets limits for the presence of deleterious substances in the aggregate, and these limits are determined through independent sample testing. The standard also requires the aggregate to undergo a soundness test, where it needs to show a loss within the specified limits.

Furthermore, the standard includes a density test that needs to be performed on the aggregate. This test helps determine the compactness and weight of the aggregate. Additionally, the standard provides guidelines for calculating the air content of mortars, which is an important factor in ensuring the workability and performance of the masonry mortar.