Clay swelling inhibition mechanism of a,?-diaminoalkanes in Portland Brownstone

Timothy Wangler, George W. Scherer

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Many clay-bearing sedimentary stones such as Portland Brownstone will swell when exposed to water, and this can generate damaging stresses as differential strains evolve during a wetting cycle. Current swelling inhibitors, consisting of a,?-diaminoalkanes, can reduce swelling in Portland Brownstone up to 50%. In this study, through x-ray diffraction and swelling strain experiments, we demonstrate that the a,?-diaminoalkanes inhibit swelling by substituting for interlayer cations and partially hydrophobicizing the interlayer, then rehydrating on subsequent wetting cycles. We also introduce the copper (II) ethylenediamine complex as a potential treatment for swelling inhibition.

Original languageEnglish (US)
Pages (from-to)1646-1652
Number of pages7
JournalJournal of Materials Research
Issue number5
StatePublished - May 2009

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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