ALTERNATIVE OR COMPLEMENTARY METHODS FOR ASSESSMENT OF FINE AGGREGATES

With the increasing use of processed quarry fines/ manufactured sands as a replacement for natural sands in concrete, it is becoming clear that some of the current methods, prescriptive requirements and suitability criteria, applicable for natural sands, are inadequate for the characterisation of manufactured sands. The present study is focused in bringing scientific and further practical evidence in supporting a separate specification and set of methods for evaluation and classification of manufactured sands to be used in concrete. With regard to the -75micro m fraction, there are two amendments proposed: a possible alternative for the MBV method for quantifying the amount of harmful clays in aggregate fines, and a redefinition of the specified limits for -75micro m fraction of manufactured sands used in concrete. As far as the flow cone test method (ASTM C1252) is concerned, a modified procedure is investigated, in order to compensate for the shortfall in the method, where two material attributes are measured using one parameter. Also, in order to fill a gap between the physical and mechanical properties of fine aggregates and their actual performance in concrete, a mortar-based test is presented as a reliable and fast small-scale method in evaluating the suitability and relative performance of different fine aggregates to be used in concrete.

• Supplemental Notes:
  • Full conference proceedings available on CD-ROM.
• Corporate Authors:

  University of Texas, Austin

  International Center for Aggregates Research, 3208 Red River
  Austin, TX  United States  78705-2650

  Texas A&M University, College Station

  Faculty Exchange Box H
  College Station, TX  United States  77843
• Authors:
  • Dumitru, I
  • Paraschiv, V
  • Glass, C
  • Mandarakas, G
• Conference:
  • International Center for Aggregates Research 9th Annual Symposium: Aggregates - Concrete, Bases and Fines
  • Location: Austin, Texas
  • Date: 2001-4-22 to 2001-4-25
• Publication Date: 2001

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 19p

Subject/Index Terms

• TRT Terms: Clay; Concrete; Evaluation and assessment; Fine aggregates; Fines (Materials); Mechanical properties; Mortar; Physical properties; Quarries; Testing
• Uncontrolled Terms: Manufactured sands
• Subject Areas: Geotechnology; Highways; I36: Aggregates;

Filing Info

• Accession Number: 00983560
• Record Type: Publication
• Report/Paper Numbers: Final Draft
• Files: TRIS
• Created Date: Dec 23 2004 12:00AM