HYPOTHESIS FOR REINFORCEMENT OF PORTLAND CEMENT BY POLYMER LATEXES

Vinylidene chloride and styrene-butadiene copolymer latexes are used commercially to reinforce portland cements. A hypothesis is proposed to explain this reinforcement. Latex substitutes for all or part of the water to give the same fludity at a lower water/cement ratio. Latex particles coalesce around each unhydrated (or slightly hydrated) cement grain and aggregate particle to form an interpenetrating network of polymer throughout the structure. Microcracks form throughout the structure to relieve the strain introduced by the shrinkage of the portland cement that occurs when the relative humidity falls below 100 percent. A propagating microcrack intersects the interpenetrating polymer network to form microfibers spanning the microcrack, sometimes so effectively that propagation is halted, but always so that the microcrack is held together. This hypothesis was supported by scanning electron microscopy of latex-modified cement specimens, as well as by other experiments.

  • Corporate Authors:

    American Ceramic Society

    4055 North High Street
    Columbus, OH  USA  43214

    American Ceramic Society

    65 Ceramic Way
    Columbus, OH  USA  43714
  • Authors:
    • Isenburg, J E
    • Vandehaff, J W
  • Publication Date: 1974-6

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Filing Info

  • Accession Number: 00260658
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM