ASTM D698-12(R2021) pdf free download

ASTM D698-12(R2021) pdf free download.Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort
1. Scope
1.1 These test methods cover laboratory compaction meth- ods used to determine the relationship between molding water content and dry unit weight of soils (compaction curve) compacted in a 4 or 6-in. (101.6 or 152.4-mm) diameter mold with a 5.50-lbf(24.5-N) rammer dropped from a height of12.0 in. (305 mm) producing a compactive effort of 12 400 ft-lbf/ ft 3 (600 kN-m/m 3 ). N OTE 1—The equipment and procedures are similar as those proposed by R. R. Proctor (Engineering News Record—September 7, 1933) with this one major exception: his rammer blows were applied as “12 inch firm strokes” instead of free fall, producing variable compactive effort depend- ing on the operator, but probably in the range 15 000 to 25 000 ft-lbf/ft 3 (700 to 1200 kN-m/m 3 ). The standard effort test (see 3.1.4) is sometimes referred to as the Proctor Test. 1.1.1 Soils and soil-aggregate mixtures are to be regarded as natural occurring fine- or coarse-grained soils, or composites or mixtures of natural soils, or mixtures of natural and processed soils or aggregates such as gravel or crushed rock. Hereafter referred to as either soil or material. 1.2 These test methods apply only to soils (materials) that have 30 % or less by mass of particles retained on the 3 ⁄ 4 -in. (19.0-mm) sieve and have not been previously compacted in the laboratory; that is, do not reuse compacted soil. 1.2.1 For relationships between unit weights and molding water contents of soils with 30 % or less by mass of material retained on the 3 ⁄ 4 -in. (19.0-mm) sieve to unit weights and molding water contents of the fraction passing 3 ⁄ 4 -in. (19.0- mm) sieve, see Practice D4718/D4718M. 1.3 Three alternative methods are provided. The method used shall be as indicated in the specification for the material being tested. If no method is specified, the choice should be based on the material gradation.
1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026, unless superseded by this standard. 1.6.1 For purposes of comparing measured or calculated value(s) with specified limits, the measured or calculated value(s) shall be rounded to the nearest decimal or significant digits in the specified limits. 1.6.2 The procedures used to specify how data are collected/ recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The proce- dures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any consider- ations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design. 1.7 The values in inch-pound units are to be regarded as the standard. The values stated in SI units are provided for information only, except for units of mass. The units for mass are given in SI units only, g or kg. 1.7.1 It is common practice in the engineering profession to concurrently use pounds to represent both a unit of mass (lbm) and a force (lbf). This implicitly combines two separate systems of units; that is, the absolute system and the gravita- tional system. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. This standard has been written using the gravitational system of units when dealing with the inch-pound system. In this system, the pound (lbf) represents a unit of force (weight). However, the use of balances or scales recording pounds of mass (lbm) or the recording of density in lbm/ft 3 shall not be regarded as a nonconformance with this standard.