Volcanic cities and their fire hazard
During a post-doctoral internship in the Section for Mineralogy, Petrology and Geochemistry , Dr. Michael Heap (now at the Institut de Physique du Globe de Strasbourg) and colleagues have exposed zeolite-bearing tuff, a common building material (current worldwide zeolitized tuff consumption as a dimension stone is at about 3 x 106 tons per year), as a liability in fire hazard mitigation. These thermally-unstable zeolites represent the “cement” that promoted lithification and consequently, upon their loss at high temperature, the structural integrity of the tuff deteriorates significantly. The implications of their findings are that, in the event of fire, the stability of buildings or structures built from tuff containing thermally-unstable zeolites will be jeopardized.
The study recommends that this knowledge should be considered during fire hazard mitigation and that tuffs used in construction worldwide should be tested to deduce whether they contain thermally-unstable zeolites.
These findings have been recently reported in the prestigious journal “Geology”.“How tough is tuff in the event of fire?” by Heap, Lavallée, Laumann, Hess, Meredith, and Dingwell.
Dr. Michael Heap
Institut de Physique du Globe de Strasbourg
(UMR 7516 - Université de Strasbourg / CNRS)
Prof. Dr. Donald B. Dingwell
Earth and Environment, University of Munich