QUICK METHODS FOR SOIL MECHANICS LABORATORIES

METODOS RAPIDOS PARA LABORATORIOS DE MECANICA DE SUELOS

This paper describes the introduction of vacuum drying in the determination of moisture content and the compleximetry of sulphate anions in soils containing gypsum in a construction laboratory. When a soil is determined to be aggressive to concrete, some corrections are introduced by the existence of chlorides and hydrocarbonates. A maximum possible error of 50 ppm in excess is established to allow for the presence of nitrates, nitrites and phosphates affecting the permanent hardness of aqueous extract. Great accuracy is not required in the identification and classification of a soil. For identifying gypsum in a soil, the use of indicator rods is recommended. The techniques involving an outer indicator, analytical instrumentation, ionic exchange and excessive or slow handling are advised against, the latter being limited to the minimum stirring of a sample of the soil inside a mass of water, filtration with a diatomaceous earth filtering bed with the aid of vacuum suction and direct evaluation. The problem of the limited solubility of gypsum is eliminated by extracting it by means of relatively large volumes of water, thus making it easier to use very heavy soil samples, while providing highly accurate and representative results. /TRRL/

  • Availability:
  • Corporate Authors:

    Escuela de Ingenieros de Caminos Canales y Puertos

    Ciudad Universitaria
    Madrid 3,   Spain 
  • Authors:
    • Ruizarroel, S
  • Publication Date: 1977-11

Language

  • Spanish

Media Info

  • Features: References; Tables;
  • Pagination: p. 857-863
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196828
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 15 1979 12:00AM