ASTM D4318-17 pdf free download.Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils.
1 .1 These test methods cover the determination of the liquid limit, plastic limit, and the plasticity index of soils as defined in Section 3 on Terminology.
1 .2 Two procedures for preparing test specimens are provided as follows: Specimen Preparation Procedure 1 (Wr Preparation), as described in 11 . 1 and Specimen Preparation Procedure 2 (Dry Preparation), as described in 11 .2. The specimen preparation procedure to be used shall be specified by the requesting authority. If no specimen preparation procedure is specified, use the wet preparation procedure. (Sec Section 6, Interferences.)
1.3 Two methods for determining the liquid limit arc provided as follows: Liquid Limit Method A (Multipoint Method), as described in Sections 12 and 13, and Liquid Limit Method B (One-Point Method), as described in Sections 14 and 15. The method to be used shall be specified by the requesting authority. If no method is specifIed. use Method A. (See Section 6. Interferences.)
1 .4 The plastic limit test, Method for Plastic Limit, is performed on material prepared for the liquid limit test. When determining the plastic limit, two procedures for rolling portions of the test specimen are provided as follows: Plastic Limit Rolling Procedure I (Hand Rolling), and Plastic Limit Rolling Procedure 2 (Using the Rolling Device).
1.8 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units, which are provided for information only and arc not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard.
1.8.1 The converted inch-pound units use the gravitational system of units. In this system. the pound (lhf) represents a unit of force (weight). while the unit for mass is slugs. The converted slug unit is not given, unless dynamic (F = ma) calculations are involved.
1.8.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (ibm) and of force (lbf). This implicitly combines two separate systems of units; that is. the absolute system and the gravitational system. it is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational systen1 of inch-pound units and does not use/present the slug unit for niass. However, the use of balances or scales recording pounds of mass (ibm) or recording density in Ibm/ft3 shall not he regarded as nonconformance with this standard.
1.8.3 The “alternative” sieve size designations listed in Specification E11 for the 425-pm and 2.00-mm sieves are given in parentheses following the “standard” designations, that is, 425-pm (No. 40) and 2.00-mm (No. 10).
1.8.4 The standard units for the resilience tester covered in Annex A I are inch-pound. not SI. The SI values given in Fig. Al.l are for information only.
1.9 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
1.9.1 For purposes of comparing a 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.
1.9.2 The procedures used to specify how data arc collectcd/ recorded or calculated, in this standard are regarded as the industry standard.ASTM D4318 pdf download.