The behaviour of consolidated volcanic tuffs: Weathering mechanisms under simulated laboratory conditions

H. Stück, L. Z. Forgó, J. Rüdrich, S. Siegesmund, A. Török

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Five volcanic tuffs ranging from dacitic tuffs of Hungary to rhyolite, phonolite and basaltic tuffs of Germany were consolidated under laboratory conditions. Prior to consolidation an anti-hygro, a hydrous consolidant, which reduces the swelling ability of clay minerals, was applied. The three consolidants, a silicic acid ester (SAE), an elastic silicic acid ester (eSAE) and an acrylate resin (PMMA) were applied on test specimens under vacuum. Petrographic characterisation (polarizing microscopy, XRD, SEM) provided data for fabric analyses and the mineral composition of the tuffs. Changes in fabric, effective porosity, density, tensile strength, ultrasonic wave velocity were evaluated after the treatment. Weathering simulation tests such as hygric dilatation and thermal dilatation aimed to prove the effectiveness of consolidation and the durability of consolidated tuff samples. More than 500 samples were analysed. The tests showed that SAE caused the highest increase in indirect tensile strength. The water absorption and the pore size distribution of the tuffs were modified by consolidation. The PMMA reduced the water absorption the most, whereas SAE modified it the least. All the tested consolidants increased the thermal dilatation of the tuffs. The changes in hygric dilatation were not uniform: for most tuffs SAE increased and PMMA decreased the hygric dilatation, although the clay-rich Habichtswald tuff showed the opposite trend. The changes in hygric and thermal behaviour of consolidated tuff require special care when specific consolidants are chosen. These products modify the physical properties of consolidated tuffs and change the behaviour of weathering.

Original languageEnglish
Pages (from-to)699-713
Number of pages15
JournalEnvironmental Geology
Volume56
Issue number3-4
DOIs
Publication statusPublished - Dec 2008

Fingerprint

Silicic Acid
silicic acid
Weathering
weathering
ester
Esters
tuff
esters
Polymethyl Methacrylate
Acids
Consolidation
consolidation
Water absorption
tensile strength
heat
Tensile strength
phonolite
Ultrasonic velocity
testing
behavior change

Keywords

  • Durability
  • PMMA
  • Silicic acid ester
  • Strengthening agents
  • Tuff

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Water Science and Technology
  • Soil Science

Cite this

The behaviour of consolidated volcanic tuffs : Weathering mechanisms under simulated laboratory conditions. / Stück, H.; Forgó, L. Z.; Rüdrich, J.; Siegesmund, S.; Török, A.

In: Environmental Geology, Vol. 56, No. 3-4, 12.2008, p. 699-713.

Research output: Contribution to journalArticle

Stück, H. ; Forgó, L. Z. ; Rüdrich, J. ; Siegesmund, S. ; Török, A. / The behaviour of consolidated volcanic tuffs : Weathering mechanisms under simulated laboratory conditions. In: Environmental Geology. 2008 ; Vol. 56, No. 3-4. pp. 699-713.
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