SOIL SWELLING TEST

STUDIES ON LATERITES FROM THE PORTUGUESE OVERSEAS PROVINCES WERE CARRIED OUT IN ORDER TO INVESTIGATE HOW FAR THE RECOMMENDED LIMITS CAN BE SAFELY EXCEEDED IN ORDER TO APPLY MATERIALS WHICH OTHERWISE SHOULD NOT BE ACCEPTED FOR ROAD CONSTRUCTION IN FACE OF THE STANDARDS. DUE TO THE REDUCED CHEMICAL ACTIVITY AND CONSEQUENTLY LOW EXPANSIBILITY WHICH ARE TYPICAL OF THE FINE FRACTIONS OF LATERITIC SOILS, IT WAS SOUGHT TO ASSOCIATE THE CONSISTENCY LIMITS TO A NEW SWELLING PARAMETER RELATED WITH THOSE PROPERTIES, WHICH WOULD MAKE IT POSSIBLE TO ASCERTAIN THE NATURE OF THE MATERIAL. A QUICK TEST BASED ON A METHOD FOLLOWED AT ESTACAO AGRONOMICA NACIONAL /NATIONAL AGRONOMIC STATION/ WAS CONDUCTED. STUDIES WERE SUBSEQUENTLY CARRIED OUT IN ORDER TO IMPROVE THIS METHOD WITHOUT IMPAIRING ITS CHARACTERISTICS OF QUICKNESS AND SIMPLICITY. THE STUDY INCLUDED A CRITICAL ANALYSIS OF THE FIRST TENTATIVE STANDARD, THE DEVELOPMENT OF A NEW APPARATUS FOR THE SWELLING TEST, THE STANDARDIZATION OF COMPACTION METHOD AND STUDIES ON THE INFLUENCE OF THE INITIAL MOISTURE CONTENT OF THE SOIL, A METHOD FOR MEASURING THE EXPANSION BY MEANS OF DIAL GAGES AND THE STANDARDIZATION OF THE FORCE EXERTED BY THEM ON THE SAMPLE, AND THE DISPERSION OF THE RESULTS SUPPLIED BY THE METHOD IN ITS NEW FORM. A RELATION BETWEEN THE SWELLING VALUES DETERMINED BY THE FIRST AND THE SECOND TENTATIVE STANDARDS WAS ALSO ESTABLISHED.

• Corporate Authors:

  Nat Lab Civil Eng, Lisbon /Port

  ,    
• Authors:
  • de Castro, E
• Publication Date: 1964

Language

• English

Media Info

• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Building materials; Chemical reactivity; Compaction; Expansion; Laterites; Measuring instruments; Moisture content; Road construction; Standards; Swelling; Test procedures; Utilization
• Subject Areas: Geotechnology; Highways; Research;

Filing Info

• Accession Number: 00231067
• Record Type: Publication
• Report/Paper Numbers: Tech Paper 235
• Files: TRIS
• Created Date: Aug 15 2004 1:40AM