THE MACROPOROSITY OF ARTIFICIAL AGGREGATES OF VARYING TEXTURE

Artificial soil blocks were made by mixing either ballotini or natural sand with a suspension of silt and clay (fines). The soil was allowed to dry, shrinkage was measured, and from thin sections, the type, area and size of voids in the horizontal plane were observed. As the fines content increased, from 0 to 25%, packing voids (spaces caused by a lack of sufficient small particles to fill voids between sand grains) decreased and were partly replaced by fissures (caused by shrinkage of fines leading to isolated cracks within blocks). From 25% to 50% fines, aggregate shrinkage increased rapidly resulting in the development of large inter-aggregate voids, but packing voids and fissures decreased. There was a transfer of porosity from within the block to the inter-aggregate spaces as the fines content increased. Blocks containing coarse sand-size particles had larger packing voids and fissures, a greater area of fissures, but similar shrinkage to blocks containing fine sand-size particles.(a)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00224588
• Corporate Authors:

  Blackwell Scientific Publications Limited

  Osney Mead
  Oxford OX2 0EL,   England 
• Authors:
  • Shiel, R S
  • Adey, M A
  • Shannon, J B
• Publication Date: 1988-12

Language

• English

Media Info

• Pagination: p. 629-38
• Serial:
  • JOURNAL OF SOIL SCIENCE
  • Volume: 39
  • Issue Number: 4
  • Publisher: Blackwell Scientific Publications Limited
  • ISSN: 0022-4588

Subject/Index Terms

• TRT Terms: Aggregates; Clay; Cracking; Porosity; Sand; Shrinkage; Silts; Soils
• Uncontrolled Terms: Particle size distribution
• ITRD Terms: 4577: Aggregate; 4177: Clay; 5211: Cracking; 6200: Particle size distribution; 5938: Porosity; 4105: Sand; 4743: Shrinkage; 4149: Silt; 4156: Soil
• Subject Areas: Geotechnology;

Filing Info

• Accession Number: 00487397
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Sep 30 1989 12:00AM