ASTM D558/D558M-19 PDF Download

ASTM D558/D558M-19 is a standard that provides test methods for determining the moisture-density (unit weight) relationships of soil-cement mixtures before cement hydration. The purpose of these tests is to determine the optimum water content and maximum density to be used for molding soil-cement specimens.

The standard includes two methods, Test Method A and Test Method B, which are used depending on the soil gradation. Test Method A is used when 100% of the soil sample passes the No. 4 sieve, while Test Method B is used when part of the soil sample is retained on the No. 4 sieve (up to 30% retained on the 3/4-inch sieve).

There are a few notable differences between this standard and Test Method D698. Firstly, ASTM D558/D558M-19 allows for a larger maximum particle size in the 4-inch mold compared to Test Method D698. Secondly, the standard permits the reuse of the material leftover after obtaining the water content specimen, whereas Test Method D698 does not allow reuse. Lastly, ASTM D558/D558M-19 allows for the scalp and replacement technique, where material retained on the 3/4-inch sieve and passing the 3-inch sieve can be discarded and replaced with material passing the 3/4-inch sieve and retained on the No. 4 sieve, while Test Method D698 does not permit this technique.

It is important to note that the quality of the results produced by this standard depends on the competence of the personnel performing the tests and the suitability of the equipment and facilities used. Compliance with Practice D3740, which provides criteria for competent and objective testing, sampling, and inspection, does not guarantee reliable results. Various factors can affect the reliability of results, and Practice D3740 only evaluates some of these factors.

The units used in this standard can be stated in inch-pound or SI units, and they should be regarded separately as standard. Combining values from the two systems may result in nonconformance with the standard. The standard also provides guidance on significant digits and rounding of observed and calculated values, following the guidelines established in Practice D6026.