Dimensional stability of pore reduced cement (PRC)

D Israel, Donald E MacPhee, Eric Lachowski

Research output: Contribution to journalArticle

Abstract

Pore Reduced Cements (PRC) are high density, high strength materials which are made by the pressing of immature ordinary Portland cement (OPC) pastes during which there is partial removal of excess mix water. The resulting reduction in the effective water/cement (w/c) ratio and the significant reduction in porosity can increase paste densities to greater than 2 600 kg/m(3) compared with 2 000 kg/m(3) in unpressed cements. The pore characteristics of PRC and their beneficial implications on its mechanical performance and durability have already been, described.: This paper deals with the dimensional stability of PRC and addresses concerns relating to the significant proportions of unhydrated clinker which remain in the matrix. Weight and dimensional changes of PRC exposed to different regimes of curing with progressing time are reported and show that PRC is dimensionally more stable than OPC. This can be explained by comparing microstructures of PRC and OPC. The penetration of moisture via connected porosity is restricted in PRC and therefore the internally isolated, un;reacted cement does not present a-potential hazard for its long term dimensional stability.

Original languageEnglish
Pages (from-to)460-463
Number of pages4
JournalZKG International
Volume51
Issue number8
Publication statusPublished - 1998

Keywords

  • cement industry
  • Portland cement
  • porosity
  • minimization
  • structure stability
  • pressing
  • performance evaluation
  • mechanical properties
  • experimental study
  • water content
  • air content
  • experimental device
  • volume expansion

Cite this

Israel, D., MacPhee, D. E., & Lachowski, E. (1998). Dimensional stability of pore reduced cement (PRC). ZKG International, 51(8), 460-463.