AASHTO T 220:66(2018) Standard Method of Test for Determination of the Strength of Soil-Lime Mixtures.
A supply of lime, preferably meeting the requirements of M 216 for either Type 1 or 11 lime.
4.2. Good quality tap water.
Select a 91-kg (200-Ib) minimum representative sample for testing.
5.2. Spread the sample on a clean, dry floor to air-dry or use forced drafts of warm air.
5.3. The aggregations or hard lumps of clay in soils containing no appreciable amounts of coarse particles shall be crushed to pass the 2.00-mm (No. 10) sieve without breaking the coarse particles. The sample shall then be screened on the 0.850-mm (No. 20) sieve and the percentages retained and passing the 0.850-mm (No. 20) sieve determined.
5.4. Clays and other soils containing coarse particles shall be broken up to pass the 4.75-mm (No. 4) sieve without breaking the coarse particles. This may be done by means of a plastic mallet, rubber covered tamper, or similar hand tools. The material shall then be separated as follows:
5.4.1. Coarse particle materials (crushed stone, gravel, sand, and caliche) shall be dry-screened over the following suggested sieves: 45. 31.5. 22.4, 16. 9.5, 4.75, and 2.00 mm (1.75, 1.25, 7/8, 5/8, 3/8 in., No. 4 and No. 10) to separate the various sizes of materials. Retain all material passing the 2.00-mm (No. 10) sieve. The material passing the 45-mm (1 .75-in.) sieve is used in making specimens. Mix all minus 2.00-mm (No. 10) material on the floor until it is uniformly blended with respect to color, appearance, and moisture content.
5.5. Determine the mass of each size of material and compute the cumulative percentages retained on each sieve and the percent passing the 2.00-mm (No. 10) sieve. These values arc not to be used as tnie sieve analysis, but are used to recombine individual specimens to ensure uniform graduation within each specimen.
5.6. On the basis of the cumulative sieve size percentages obtained in Section 5.5 above, calculate and weigh out a 4.54-kg (lO-ib) representative sample for sieve analysis and soil constants (Atterbcrg Limits). This 4.54-kg (lO-ib) sample is prepared for testing by the wet method, R 74. Rolls, tumblers, or mills that might alter the coarse particles should not be used in this preparation. Afier preparation of the sample by the wet method, the following tests shall be performed in Table 1.AASHTO T 220 pdf download.