IMPROVEMENT OF DRYING SHRINKAGE AND SHRINKAGE CRACKING OF CONCRETE BY SPECIAL SURFACTANTS . ADMIXTURES FOR CONCRETE: IMPROVEMENT OF PROPERTIES. PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM HELD BY RILEM (THE INTERNATIONAL UNION OF TESTING AND RESEARCH LABORATORIES FOR MATERIALS AND STRUCTURES), BARCELONA, MAY 14-17, 1990

This paper describes the advantages of special organic surfactants as chemical admixtures to reduce drying shrinkage and shrinkage cracking in air-dried concrete. These admixtures have been recently invented in Japan and tentatively called as shrinkage reducing agents because of the high ability reducing drying shrinkage of concrete by 20 to 40% in their standard dosages. Shrinkage tests using small specimens made of cement pastes under various humidity conditions showed that the mechanism of the reduction of shrinkage by the use of these admixtures could be almost explained by the theory of capillary tension. There was almost no decrease in mechanical properties of the concretes due to the addition of four kinds of admixtures in their standard dosages, and it was also confirmed that their addition both increased the length of time for cracks to pass through the specimens and decreased crack width. The amount of the increase in the former and the reduction of the latter were in proportion to the amount of admixtures added. (TRRL)

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  • Corporate Authors:

    Chapman and Hall Limited

    11 New Fetter Lane
    London,   England 
  • Authors:
    • Shoya, M
    • Sugita, S
    • Sugawara, T
  • Publication Date: 1990

Language

  • English

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Filing Info

  • Accession Number: 00612220
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0-412-37410-2
  • Files: ITRD, TRIS
  • Created Date: Aug 31 1991 12:00AM