A balance between materials and between properties is continually being sought in attempting to improve concrete mixes for increased performance and improved workability. This article discusses whether fine mineral admixtures should be excluded from ordinary concrete mixtures without superplasticisers, to control the concrete density. To answer this question, the authors studied the rheological behaviour of pastes and mortars, prepared with nine fine mineral admixtures, with different origin, mineralogy, and fineness. The selected admixtures covered a wide range of mineral compositions and granular and textural properties. The article first lists the materials used and describes the methods for measuring the water demands of pastes and mortars. A threefold classification of the admixtures was developed in relation to these demands. It was found that the water demand of the admixtures was not correlated with their mineral and granular properties, but that textural properties of their particles must be considered, to explain the observed values. The study of mortars was conducted with the intention of confirming conclusions reached about the rheological behaviour of pastes. The rheological behaviour of mixtures with a low proportion of fine mineral admixture was also studied.

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  • Corporate Authors:

    Palladian Publications Limited

    15 South Street
    Farnham Surrey GU97QU,   United Kingdom 
  • Authors:
    • Gallias, J L
    • KARA-ALI, R
  • Publication Date: 1999-3


  • English

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Filing Info

  • Accession Number: 00767099
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 6 1999 12:00AM