Environmental Earth Sciences

, Volume 63, Issue 7–8, pp 1565–1572 | Cite as

Flaw propagation and buckling in clay-bearing sandstones

  • Timothy P. Wangler
  • Alisa Stratulat
  • Philippa Duffus
  • Jean H. Prévost
  • George W. Scherer
Special Issue

Abstract

Many historically and culturally significant buildings have sandstones that contain swelling clay inclusions in the binding phase. Differential strains that evolve during wetting and drying cycles can generate stresses that are on the order of the strength of the stone, leading to degradation. Most damage observed in the field is surface delamination and buckling of the stone over a flaw, indicating that the damage is occurring during wetting. Classical buckling theory predicts buckling to occur at a particular aspect ratio, or flaw size. The results of this study confirm buckling theory experimentally. Through finite-element simulation and experiment, the study then explores a potential flaw propagation mechanism whereby nonuniform wetting patterns generate stress intensities capable of flaw propagation. As a result, small natural flaws can grow to the critical size necessary for buckling.

Keywords

Clay Swelling Stress Finite-element analysis Crack growth Buckling Cultural heritage 

Notes

Acknowledgments

This work was supported in part by grant MT-2210-07-NC-05 from the National Center for Preservation Technology and Training.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Timothy P. Wangler
    • 1
    • 2
  • Alisa Stratulat
    • 3
  • Philippa Duffus
    • 3
  • Jean H. Prévost
    • 4
  • George W. Scherer
    • 4
  1. 1.Institute for Technology in Architecture, ETH ZürichZurichSwitzerland
  2. 2.Empa Swiss Federal Institute for Materials Testing and ResearchDübendorfSwitzerland
  3. 3.Department of MaterialsUniversity of OxfordOxfordUK
  4. 4.Department of Civil and Environmental EngineeringPrinceton UniversityPrincetonUSA

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