Dynamic and Quasi-Static Nanoindentation of C-S-H and C-A-S-H

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Dynamic and Quasi-Static Nanoindentation of C-S-H and C-A-S-H

Author(s): William Hunnicutt, Paramita Mondal, and Leslie Struble

Publication: Special Publication

Volume: 312

Issue:

Appears on pages(s): 1-15

Keywords: C-A-S-H, C-S-H, compaction, dynamic, nanoindentation, NMR, viscoelasticity

Date: 10/1/2016

Abstract:
The viscoelastic nature of concrete is a topic of much study and the calcium-silicate-hydrate (C-S-H) phase is believed to be largely responsible for this viscoelastic behavior. In this study the viscoelastic properties of synthesized calcium-silicate-hydrate (C-S-H) and calcium-alumino-silicate-hydrate (C-A-S-H) are measured by quasi-static and dynamic nanoindentation. A protocol for synthesizing and preparing samples for chemical and mechanical characterization is presented. The addition of aluminum to C-S-H has been previously shown to modify its molecular structure, a modification that is expected to change the viscoelastic behavior. The results indicate that C-A-S-H behaves more viscously than C-S-H and a number of factors are discussed.