FURTHER STUDIES OF THE THREE-DIMENSIONAL ARRANGEMENT OF THE HYDRATION PRODUCTS OF PORTLAND CEMENTS

The continuing processes of hydration and structure formation of two types of Portland cement, clinkers and cements have been studied by X-ray diffraction, transmission electron-optical and scanning electron microscope techniques. It was observed that in the absence of gypsum, i.e., in a flash set condition, thin crystals of C4Hx formed a fairly thick coating on the cement grains and between them, which was capable of carrying some load. With time this layer of C4Hx disappeared leaving gaps in the structure for CSH needles to fill in. Matured clinker paste was a network of CSH needles into which grains of anhydrous cement, Ca(OH)2 and C3AH6 were embedded. During the initial setting period of Portland cement, the ettringite crystals decreased due to their reduction in number and the increase in number of CSH needles. Ultimately the main load bearing network consisted of CSH needles. Attention is drawn to some probable misinterpretation of scanning electron micrographs in literature. /IRRD/

  • Availability:
  • Corporate Authors:

    Cement Marketing Company of India Limited

    Cement House, 121 Maharshi, Karve Road
    Bombay 400-020,   India 
  • Authors:
    • Chatterji, S
    • Jeffery, J W
  • Publication Date: 1971-4

Media Info

  • Features: Photos; References; Tables;
  • Pagination: p. 167-172
  • Serial:
    • Indian Concrete Journal
    • Volume: 45
    • Issue Number: 4
    • Publisher: Associated Cement Companies Limited
    • ISSN: 0019-4565

Subject/Index Terms

Filing Info

  • Accession Number: 00081764
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 15 1975 12:00AM