The article discusses recent reported research into the significance of the crystal structure in the formation of solidified cement slurry. The scanning electron microscope and x-ray spectrometer technique have been used to show that individual grains of portland cement become hydrated by a two-stage process. Hydrated calcium silicate spikes grow from a gell-like shell initially formed around the grain. It is thought that tricalcium silicate crystals contribute to the early strength with dicalcium silicate providing long term increases in strength. The author discusses the production of aggregate and ordinary portland cement in a two-reactor system and outlines the principles of the expanded precessive plasma (epp) reactor. The relationship between porosity and the compressive strength of cement paste is examined. The possibility of using colliery spoil and pulverised fuel ash to produce cement is investigated. Quality criteria, relating to the best crystal growth, author indicates the most desirable properties suggesting that natural minerals are not only inexpensive but harmless compared with synthetic compounds which may decay into toxic forms. /TRRL/

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Authors:
    • Braun, W M
  • Publication Date: 1978

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 30
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00195447
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Sep 15 1979 12:00AM