THE EFFECT OF BINDER SELECTION AND NATURAL EXPOSURE ON THE LONG TERM ABRASION RESISTANCE OF CONCRETE BEAMS

This paper compares the results of applying the MA20SA abrasion test to concrete blocks after 28 days with the results of applying it to the same blocks after seven years. In the period between the two tests, the blocks were stored in a single layer in the open air, exposed to the weather. A dramatic increase in abrasion resistance was observed, as high as 400% in some cases. This was surprising in view of the relative aridity of the area where the tests were performed. The most likely reason for the sharp increase in abrasion resistance is that it is mainly due to carbonation, with natural curing as a subsidiary effect. A technique is specified to investigate carbonation effects further. A high correlation was found between the seven-year laboratory abrasion indices and 'indices' calculated from the measured wear on equivalent site blocks, subjected to heavy pedestrian and vehicular traffic for six years. Thus the results of laboratory tests on the seven-year old blocks are confirmed by observations of wear on-site. The type of binder used was also found to have a significant effect on the long-term abrasion resistance of the blocks. The results strongly suggest that concrete paved block surfaces could become substantially harder with time.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03799824
• Corporate Authors:

  DAVMARK (PTY) LTD

  PO BOX 41412
  HALFWAY HOUSE,   South Africa  2024
• Authors:
  • PAPENFUS, N J
• Publication Date: 1995-8

Language

• English

Media Info

• Features: References;
• Pagination: p. 19,21-3
• Serial:
  • CONCRETE BETON
  • Issue Number: 77
  • Publisher: Concrete Society of Southern Africa
  • ISSN: 0379-9824

Subject/Index Terms

• TRT Terms: Binders; Carbonates; Concrete; Concrete curing; Hardness; Measurement; Paving stones; Strength of materials; Test procedures; Tests; Traffic; Wear; Weather
• Uncontrolled Terms: Increase
• ITRD Terms: 4948: Binder; 7312: Carbonate; 4755: Concrete; 4702: Curing (concrete); 5914: Hardness; 9032: Increase; 6136: Measurement; 4508: Sett (stone); 5544: Strength (mater); 6255: Test; 6288: Test method; 755: Traffic; 5293: Wear; 2545: Weather
• Subject Areas: Operations and Traffic Management;

Filing Info

• Accession Number: 00720783
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: May 24 1996 12:00AM