LOWER-GRADE AGGREGATES IN CONCRETE: LONG-TERM DURABILITY REPORT

This paper presents some extensive data on the durability of crushed Jurassic limestone aggregates and porous sandstone aggregates, and the results of some natural weathering tests. Concrete mixes were prepared for the durability tests on saturated 100mm concrete cubes, including outdoor exposure to weather for ten years and severe freezing tests on a few samples. The durability results are tabulated for various types of limestone and sandstone aggregates. Some permeability tests were also conducted. In the long-term durability trials of Jurassic limestone and porous sandstone aggregates, no serious problems were met, and good results were obtained, suitable for a wide range of applications. Only a few types of aggregates gave less satisfactory results. For all but the most severe situations, the aggregate is protected by being enveloped by the concrete matrix, and it assists the frost resistance of the matrix by providing relief volume for ice formation. This effect depends on the available pore space in the aggregate. Porosity also helps to suppress expansion due to the alkali-silica reaction. In most saturated and outdoor situations, and for concretes of roughly equivalent grade, the aggregate's porosity has little effect on the concrete's water permeability and susceptibility to carbonation.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03059421
• Corporate Authors:

  QUARRY MANAGERS' JOURNAL LTD

  7 REGENT STREET
  NOTTINGHAM,   United Kingdom  NG1 5BS
• Authors:
  • COLLINS, R
• Publication Date: 1995-12

Language

• English

Media Info

• Features: References;
• Pagination: p. 13-6,19-21
• Serial:
  • QUARRY MANAGEMENT
  • Volume: 22
  • Issue Number: 12
  • Publisher: QMJ PUBLISHING LTD
  • ISSN: 0305-9421

Subject/Index Terms

• TRT Terms: Aggregates; Alkali; Carbonates; Concrete; Crushed rock; Durability; Limestone; Oxides; Permeability; Porosity; Sandstones; Silicon; Tests; Water; Weathering
• ITRD Terms: 4577: Aggregate; 7353: Alkali; 7312: Carbonate; 4755: Concrete; 4173: Crushed stone; 5910: Durability; 4131: Limestone; 7372: Oxide; 5921: Permeability; 5938: Porosity; 4104: Sandstone; 7148: Silicon; 6255: Test; 4355: Water; 5281: Weathering
• Subject Areas: Geotechnology; Materials;

Filing Info

• Accession Number: 00720803
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, ATRI
• Created Date: May 24 1996 12:00AM