AN ATTEMPT TO ASSESS BENEFICIAL AND DETRIMENTAL EFFECTS OF ALUMINATE IN THE CEMENT ON CONCRETE PERFORMANCE - PART 2

Consideration is given to the effects of aluminate on the heat of hydration, shrinkage, sulphate resistance, durability and lump formation. In each case extensive references are given to the results of research performed by other research workers in this subject. The least controversial issue is considered to be on the heat of hydration, with research results indicating that the cement richest in aluminate emits the highest heat of hydration. Changes in shrinkage are considered to be far larger when measured on paste than on concrete specimens. But the results of tests following measurements on the effects of an increase of aluminate from 5 to 12 per cent on non-restrained shrinkage indicate that the contribution of the aluminate to the shrinkage of concrete is negligible. Results are quoted which indicate that the vulnerability of pastes and mortars to sulphate attack increases with increasing aluminate content of the cement used. However, it is suggested that test conditions have an effect on the results, and data obtained by different methods are presented in graphical form to illustrate this point. The method of test is also considered to affect the assessment of various factors on the durability of concrete, but even so observations are quoted that indicate that the lower the aluminate content the better the durability of the concrete. Similar reasoning also applies to the question of lump formation. In conclusion the authors suggest that present knowledge of the subject is far from complete. On balance, assessments of the effects of aluminate indicate that most effects are undesirable. However, the existence of some of them is felt to be questionable, and most of them are only considered to be important under special conditions. /TRRL/

  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • Schraemli, W
  • Publication Date: 1978-4

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 76-80
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00188043
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 14 1979 12:00AM