Standard Test Method for Resistance R-Value and Expansion Pressure of Compacted Soils

Importancia y uso:

4.1 This test method is used to measure the potential strength of subgrade, subbase, and base course materials for use in road and airfield pavements. The R-value is used by some agencies as criteria for acceptance of aggregates for base course and bituminous courses.

FIG. 1 Tamper Shoe for Kneading Compactor

4.2 The expansion pressure testing has been used in conjunction with the R-value test to determine cover requirements (thickness) and construction controls to reduce pavement distortion from expansive subgrade soils.

Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this test method are cautioned that compliance with Practice D3740 does not in itself ensure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.

Subcomité:

D18.08

Volúmen:

04.08

Número ICS:

93.020 (Earth works. Excavations. Foundation construction. Underground works)

Palabras clave:

acceptance tests; base course; bearing capacities; compaction; dynamic bearing capacity; expansion; expansive soils; flexible pavements; foundations; highway loads; inspection; kneading compaction; laboratory tests; materials tests; pavement design; resistance value; specifications; stability; stabilometer; subbase; subbase strength; subgrade; subgrade reaction; subgrade stability; trafficability;