COMPARATIVE RESISTANCE TO SOFT WATER ATTACK OF MORTARS AND FIBRE-CEMENT PRODUCTS MADE WITH OPC AND BLENDS OF OPC AND MILLED QUARTZ, PFA AND GGBS . DURABILITY OF BUILDING MATERIALS AND COMPONENTS. PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE HELD IN BRIGHTON, NOVEMBER 7-9, 1990

Mortar prisms and fibre-cement (FC) pipes were made with ordinary portland cement (OPC), and with blends of OPC and ground granulated blastfurnace slag (GGBS), OPC and fly ash (FA), and OPC and milled quartz (MQ). The prisms were either cured under ambient conditions or autoclaved in saturated steam at elevated temperatures. The prisms and sections (rings) of the pipes were immersed in aggressive soft water containing 500 ppm carbon dioxide (CO2). Half the number of prisms and rings was brushed every two weeks to remove loose, disintegrated material and weighed. The other half was not brushed, but was also weighed every two weeks. Using the loss in mass as a measure of the degree of soft water attack, the results showed that autoclaved mortars and FC pipes containing FA or GGBS had significantly greater resistance to soft water than either of their unautoclaved equivalents. They also had greater resistance than both autoclaved and unautoclaved mortars and FC pipes containing either OPC alone or OPC and MQ. Their improved resistance to soft water attack is attributed to the formation of well-crystallised aluminian tobermorite and hydrogarnet in the autoclave. Scanning electron microscope and X-ray diffraction data are presented in the paper as evidence. A description is given of an experimental pipeline (incorporating the various FC pipes) which has been installed in a water reticulation, which will be monitored to establish whether the performance of the pipes in the laboratory will be matched in the field. (Author/TRRL)

  • Availability:
  • Corporate Authors:

    E and F Spon Limited

    2-6 Boundary Road
    London,   England 
  • Authors:
    • Kruger, J E
    • Visser, S
  • Publication Date: 1991

Language

  • English

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Subject/Index Terms

Filing Info

  • Accession Number: 00617525
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0-419-15480-9
  • Files: ITRD, TRIS
  • Created Date: Nov 30 1992 12:00AM