Volcanic sintering: Timescales of viscous densification and strength recovery.

ABSTRACT: [1] Sintering and densification are ubiquitous processes influencing the emplacement of both effusive and explosive products of volcanic eruptions. Here we sinter ash-size fragments of a synthetic National Institute of Standards and Technology viscosity standard glass at temperatures at which the resultant melt has a viscosity of ∼10⁸-10⁹ Pa.s at 1bar to assess sintering dynamics under near-surface volcanic conditions. We track the strength recovery via uniaxial compressive tests. We observe that volcanic ash sintering is dominantly time dependent, temperature dependent, and grain size dependent and may thus be interpreted to be controlled by melt viscosity and surface tension. Sintering evolves from particle agglutination to viscous pore collapse and is accompanied b

SUBMITTER: Vasseur J 

PROVIDER: S-EPMC4373153 | biostudies-literature | 2013 Nov

REPOSITORIES: biostudies-literature