ROADMAKING GRAVELS AND SOILS IN CENTRAL AFRICA

FACTORS INFLUENCING SOIL-FORMATION IN CENTRAL AFRICA ARE DISCUSSED AND THE GRAVELS AND SOILS ENCOUNTERED THERE ARE GROUPED INTO THREE CATEGORIES DEPENDING ON THE RAINFALL UNDER WHICH THEY OCCUR. IT IS ESTABLISHED THAT IN AREAS OF LOW RAINFALL THE PETROLOGICAL CHARACTERISTICS OF THE UNDERLYING ROCK HAVE A GREAT INFLUENCE ON THE PROPERTIES OF THE SOIL DERIVED FROM IT; IN AREAS OF INTERMEDIATE OR HIGH RAINFALL, ALTHOUGH THE PARENT ROCK IS STILL IMPORTANT, THE LARGE-SCALE GEOLOGICAL STRUCTURE OF THE LAND EFFECTS SOIL FORMATION TO A LESSER DEGREE BY INFLUENCING DRAINAGE. SOILS CONSIDERED ARE DETRITAL GRAVELS AND SANDS, INCLUDING GRANITIC, GNEISSIC AND QUARTZITE MATERIALS, SANDSTONE GRAVELS AND SANDS, BASALTIC AND DOLERITIC GROVELS, MICACEOUS AND SCHISTOSE MATERIALS, CARBONACEOUS SHALE, AND LIMESTONE GRAVELS; QUARTZITIC GRAVELS AND SAND CLAYS, NODULAR LATERITIC AND CALCAREOUS GRAVELS AND CRUSHED GRAVELS. /TRRL/

• Corporate Authors:

  Transport & Road Research Lab /UK

  /Overseas Bulletin
  ,   United States 
• Authors:
  • CLARE, K E
• Publication Date: 1969

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 61 p.
• Serial:
  • Issue Number: b12

Subject/Index Terms

• TRT Terms: Basalt; Clay; Geomorphology; Gneiss; Granite; Gravel; Laterites; Limestone soils; Quartzite; Rainfall; Sand; Sandstones; Soil types; Soils
• Uncontrolled Terms: Soil classification
• Old TRIS Terms: Detritus; Gneisses
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00230423
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: TRIS
• Created Date: Jul 24 1973 12:00AM