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<p>Experiments were performed to determine nanostructure characteristics that influence viscoelastic behavior of calcium-(alumino)-silicate-hydrate (C-(A)-S-H) and elucidate viscoelastic mechanisms. C-(A)-S-H was synthesized with different nanostructures, characterized with x-ray diffraction, solid-state nuclear magnetic resonance spectroscopy, thermogravimetric analysis, and creep nanoindentation. C-(A)-S-H with different <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\frac{\textrm{Ca}}{\mathrm{Si+Al}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mfrac> <mtext>Ca</mtext> <mrow> <mi mathvariant="normal">Si</mi> <mo>+</mo> <mi mathvariant="normal">Al</mi> </mrow> </mfrac> </math></EquationSource> </InlineEquation> produced specimens with varying degrees of crosslinking, mean chain length, and basal spacing. Creep nanoindentation experiments indicate differences in elastic and time-dependent behavior with different nanostructures. The results support the hypothesis that micro-sliding of C-(A)-S-H sheets relative to each other at interlayer sites is a source of viscoelastic behavior. Higher bonding forces across the interlayer reduces the amount of time-dependent deformation.</p>

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The influence of C-(A)-S-H nanostructure on viscoelasticity

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • William A. Hunnicutt,
  • Paramita Mondal,
  • Leslie J. Struble

摘要

Experiments were performed to determine nanostructure characteristics that influence viscoelastic behavior of calcium-(alumino)-silicate-hydrate (C-(A)-S-H) and elucidate viscoelastic mechanisms. C-(A)-S-H was synthesized with different nanostructures, characterized with x-ray diffraction, solid-state nuclear magnetic resonance spectroscopy, thermogravimetric analysis, and creep nanoindentation. C-(A)-S-H with different \(\frac{\textrm{Ca}}{\mathrm{Si+Al}}\) Ca Si + Al produced specimens with varying degrees of crosslinking, mean chain length, and basal spacing. Creep nanoindentation experiments indicate differences in elastic and time-dependent behavior with different nanostructures. The results support the hypothesis that micro-sliding of C-(A)-S-H sheets relative to each other at interlayer sites is a source of viscoelastic behavior. Higher bonding forces across the interlayer reduces the amount of time-dependent deformation.