STRENGTHS OF RECYCLED AGGREGATE CONCRETE MADE USING FIELD-DEMOLISHED CONCRETE AS AGGREGATE

Experimental work was conducted to determine the compressive, splitting tensile, and flexural strengths of recycled coarse aggregate concrete and to compare them with those of concrete made using natural crushed stone. The properties of the aggregate were also compared. The fine aggregate for recycled and conventional concrete was 100 percent natural sand. Two sources of recycled aggregate and one source of natural aggregate were used. Two maximum sizes of aggregates, two levels of water-cement ratio, and two levels of dry mixing time of coarse aggregate were chosen to perform the experiments based on a full-factorial design. Test results indicate that the strength characteristics of recycled aggregate concrete are influenced by key factors, such as the strength of the original concrete, the ratio of coarse to fine aggregate in the original concrete, the ratio of top size of aggregate in the original concrete to that of the recycled aggregate, and the Los Angeles abrasion loss and water absorption of recycled aggregate. These factors also influence the effect of water-cement ratio, aggregate top size, and dry mixing on the strength characteristics of recycled aggregate concrete. It is also shown that the conventional relationships between splitting tensile, flexural, and compressive strengths may have to be modified for recycled aggregate concrete. The final conclusion is that through proper measures high-quality concrete materials can be produced using recycled concrete aggregate. For this purpose, it is necessary to determine the properties of the original concrete, based on which realistic qualities can be targeted for recycled aggregate concrete.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Tavakoli, M
  • Soroushian, P
• Publication Date: 1996-3

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 182-190
• Serial:
  • ACI Materials Journal
  • Volume: 93
  • Issue Number: 2
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-325X
  • Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

• TRT Terms: Aggregates; Alternatives analysis; Compressive strength; Concrete; Demolition; Flexural strength; Recycling; Tensile strength
• Subject Areas: Geotechnology; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00724424
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: Aug 13 1996 12:00AM