LIGHTWEIGHT EXPANDED CLAY AND SHALE AGGREGATES

LES GRANULATS LEGERS D'ARGILE ET DE SCHISTE EXPANSES

Details are given of the use and manufacture of lightweight expanded clay and shale aggregates. The formation of small cavities within the aggregates occurs between 1100 and 1200 degrees. This phenomenon is conditioned by the presence in the clay of mineral ingredients, which cause gaseous emissions at a temperature superior or equal to that of the melting of the clay and by the occurrence of a melting phase of sufficient viscosity to capture the gases emitted. Data are presented on the raw materials used in manufacture (mainly clay and shale) and the most satisfactory characteristics. The technological aspects of manufacture are described: preparation of the materials, drying, baking, together with the main characteristics: bulk density (250 to 900 kg/m3), water absorption coefficient (lower than 15%), chemical composition (the specification is being drafted and will limit the sulphur content). Research is being carried out to investigate methods of measuring the mechanical strength. The main uses are reviewed. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00453900
• Corporate Authors:

  Editeur Dunod

  26 Boulevard de l'Hopital
  Paris 5e,   France 
• Authors:
  • Alviset, L
• Publication Date: 1972-6

Language

• French

Media Info

• Features: Figures; Photos;
• Pagination: p. 201-203
• Serial:
  • Construction
  • Volume: 27
  • Issue Number: 6
  • Publisher: Reed Construction Data
  • ISSN: 0045-3900

Subject/Index Terms

• TRT Terms: Absorption; Aggregates; Bulk density; Chemical analysis; Chemical composition; Clay; Density; Expanded clay; Expanded clay aggregates; Expanded materials; Expanded shale aggregates; Gases; High temperature; Holes; Lightweight aggregates; Lightweight materials; Manufactures; Manufacturing; Shale; Sulfur; Temperature; Water
• Uncontrolled Terms: Cavities
• Old TRIS Terms: Aggregate characteristics
• ITRD Terms: 6758: Absorption; 4577: Aggregate; 5532: Compression; 5906: Conductivity (heat); 5908: Density; 4596: Expanded clay; 4502: Expanded material; 6743: Heat; 6914: Insulation; 9038: Lightweight; 4740: Lightweight concrete; 3647: Manufacture; 4168: Shale; 6748: Sound; 5544: Strength (mater); 4355: Water
• Subject Areas: Geotechnology; Highways; I36: Aggregates;

Filing Info

• Accession Number: 00099620
• Record Type: Publication
• Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
• Files: ITRD, TRIS
• Created Date: Nov 18 1975 12:00AM