ASTM C1403-15 PDF Download

The ASTM C1403-15 standard provides a laboratory procedure for determining the relative water absorption properties of mortars used in masonry construction. This test method is not intended for field use as the specimens are made under controlled laboratory conditions and do not account for factors such as the masonry substrate or field mixing procedures. The test results can be used to evaluate the effectiveness of water repellent admixtures or the impact of other admixtures and mortar components on the water repellency of a mortar. However, caution must be exercised in interpreting the results, as the resistance of masonry to water penetration depends on various factors including workmanship, bond extent, and the properties of the masonry units and mortar.

The purpose of this standard is not to determine the effectiveness of water repellent coatings. It specifically focuses on the water absorption characteristics of masonry mortars. The test method does provide temperature specifications, with inch-pound units given in parentheses for informational purposes.