Journal of Materials Science

, Volume 16, Issue 2, pp 345–354 | Cite as

Effects of tobermorite and calcium silicate hydrate (I) crystals formed within polymer concretes

  • T. Sugama
  • L. E. Kukacka
  • W. Horn


In the development of hydrothermally stable vinyl-type polymer concretes (PC), the effect of calcium silicate hydrates produced by the hydrothermal reaction of an anhydrous cement-silica flour system used as a filler in the PC was determined. Results from measurements of the mechanical properties of PC specimens after exposure to a 25% brine solution at a temperature of 240° C for 10, 30 and 90 days were used to quantify these effects. In addition, X-ray diffraction, differential thermal analysis, and scanning electron microscopy were used to perform quantitiative and morphological analyses of hydrated calcium silicate compounds synthesized during exposure to hot brine of PC samples containing cements having molar ratios of CaO/SiO2 of 1.33, 0.99 and 0.54. The data indicated that 11.3 Å tobermorite and calcium silicate hydrate-(I)-type [C-S-H(I)] crystals produced from the hydrothermal reactions of cement having the lowest CaO/SiO2 ratio of 0.54 significantly affect the long-term hydrothermal stability of the composite. Exposure for approximately 30 days to a 240° C hydrothermal environment was required for synthesis of a highly crystalline tobermorite to occur on the amorphous polymer surfaces. Morphological examination of tobermorite revealed circular radiating crystals of diameter about 20μm.


Differential Thermal Analysis Polymer Surface Calcium Silicate Hydrothermal Reaction Calcium Silicate Hydrate 
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Copyright information

© Chapman and Hall Ltd 1981

Authors and Affiliations

  • T. Sugama
    • 1
  • L. E. Kukacka
    • 1
  • W. Horn
    • 1
  1. 1.Process Sciences Division, Department of Energy and EnvironmentBrookhaven National LaboratoryUptonUSA

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