An experimental programme was undertaken with water-cement ratio, aggregate-cement ratio and aggregate size as the three main factors in the investigation. Each of the three factors occupied three levels, resulting in an experiment with 27 different mix proportions. The permeation properties (the air permeability and the sorptivity) were measured with the Autoclam permeability system, an apparatus developed by the Structural Materials Research Group at The Queen's University of Belfast. The durability characteristics were measured also in terms of the freeze-thaw deterioration and the depth of carbonation. This paper describes the design of this factorial experiment in detail and illustrates the method of analysis which could be used to derive both the main and interaction effects of factors on the measured properties. Although progress could be made to achieve an optimum combination of various mix parameters from the durability point of view by resorting to the factorial design, the effect of various other interactive factors should be determined before any such attempts are made. (A)


  • English

Media Info

  • Features: References;
  • Pagination: p. 449-62
  • Serial:
    • Volume: 104
    • Issue Number: 4

Subject/Index Terms

Filing Info

  • Accession Number: 00675134
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Mar 28 1995 12:00AM