ASTM D1635/D1635M-19 PDF Download

ASTM D1635/D1635M-19 is a standard test method used to determine the flexural strength of soil-cement using a simple beam with third-point loading. The flexural strength of soil-cement is an important factor in pavement design and can be used to determine the thickness of pavement layers.

The standard emphasizes that the quality of the test results is dependent on the competence of the personnel performing the test and the suitability of the equipment and facilities used. It suggests that agencies meeting the criteria of Practice D3740 are considered capable of competent and objective testing. However, compliance with Practice D3740 does not guarantee reliable results, as they depend on various factors.

The test method follows a simple beam with third-point loading approach for determining flexural strength. Note 1 in the standard references Practice D1632 for methods of molding soil-cement specimens.

In terms of units, the standard uses the gravitational system of inch-pound units, where pounds represent a unit of force and slugs represent a unit of mass. The standard also provides guidelines for significant digits and rounding as established in Practice D6026.