This paper presents a study of the synergetic effects of coarse aggregate on the fresh and hardened states of concrete. The research was conducted at the Indian Institute of Science, Bangalore, India. The experiments used two types of crushed granite aggregates of different strengths and with different gradings, to which natural sand and ordinary Portland cement were added. The concrete mixes were proportioned using a new method proposed by the authors. The testing programme included the measurement of: (1) the compressive strength of rock, mortar and concrete; and (2) the workability, i.e. the compaction factor of concrete. Numerical tables in the paper give examples of values of properties of crushed aggregate, and of the effects of coarse aggregate size on concrete strength. The strength of concrete, for concrete failure with coarse aggregate crushing, is governed by the strength of the coarse aggregate. The strength of concrete, for concrete failure without coarse aggregate crushing, is associated with the coarse aggregate's physical properties. Some results on concrete strength were also obtained for an identical matrix strength and different sizes of relatively weak or relatively strong coarse aggregate; the use of pebbles rather than aggregate reduces concrete strength.

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    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • BANU, Z
    • Nagaraj, T S
  • Publication Date: 1996


  • English

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  • Accession Number: 00729168
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 12 1996 12:00AM