The aims and applications of the most important test methods for road construction are described. Knowledge of the particle-size distribution in soil facilitates accurate classification of all types of soil and gives information about the characteristic features of the various types. The grain-size distribution indicates the grain-size groups in a specific type of soil in percentages by weight. The particle sizes determined by sieving are designated according to the lengths of the sides of the holes of the square perforated plate sieve or by the inside mesh width of the wire sieve. The classification of coarse or fine-grained soils may be carried out by the grain distribution method. For further identification and classification of cohesive soil, additional test methods are necessary. Methods of determining the liquid limit of the soil, and the lowest moisture content at which the soil is plastic are described. The calcium carbide method of water content determination is outlined as well as the air-pycnometer method. Tests necessary in compacting soil are reviewed. Dry density tests are described as well as devices which determine the density by radioactive isotopes. "K" plate-bearing tests are also described.

  • Authors:
  • Publication Date: 1964-3

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  • Accession Number: 00263397
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 13 1974 12:00AM