Use of Manufactured Pellet Aggregates to Study Effect of Aggregate Crushing on Strength and Deformation Behavior at Concrete-Soil Interface

Interface between construction materials and soils play an important role in many geotechnical systems, including retaining walls, shallow and deep foundations. Interface behavior is studied using split samples consisting of concrete block at the bottom half and soil at the top half of the direct shear. The objective of this research is to assess the effect of aggregate crushing at the concrete-soil interface. To be able to control the large number of parameters affecting the interface behavior, granular soil was manufactured using fly ash by cold-bonding pelletization technique with predetermined shape, size, grain size distribution, surface roughness, water absorption, unit weight and crushing strength. The physical and mechanical properties of these aggregates were investigated by using conventional soil mechanics tests. Interface tests between lightweight aggregates and concrete showed that the effects of grain crushing, particle shape and the surface roughness of aggregates play an important role in the interface behavior between granular soils and concrete. At low normal stress values, the crushing strength of aggregates did not affect the interface behavior. For the synthetic aggregates studied, the ratio of interface to internal friction angle decreased with increasing crushing strength.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References; Tables;
  • Pagination: 13p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01152719
  • Record Type: Publication
  • Report/Paper Numbers: 10-3434
  • Files: BTRIS, TRIS, TRB
  • Created Date: Jan 25 2010 11:44AM