Hawaiian and Azorean volcanic aggregates: a preliminary study of the potential alkali-silica reaction

Oligomictic alluvial aggregates: petro-mineralogical and geochemical evaluation of sandy gravel formations on the middle course of the Danube (Hungary)

“…Bulk chemical composition of monomictic aggregates usually is considered during prediction of ASR potential (e.g. volcanites, Medeiros et al 2020;Krutilová and Přikryl 2017), especially when the petrographic modal analysis is impossible due to the very fine-grained nature of the studied rocks. Another application of major element composition is for evaluation of abrasion resistivity (Er and Tuğrul 2016).…”

“…Studies on monomictic volcanic aggregates (e.g. basalts; Korkanç and Tuğrul 2005;Medeiros et al 2020) indicated ASR-related microcracking along the aggregate grains; though, this phenomenon was affected by the glass content of volcanites. In case of the Hungarian oligomictic formations, neutral volcanites (mainly andesite) contain fresh or recrystallized matrix carrying the ASR sensitivity.…”

“…9). The neutral (silica) chemistry of andesitic rocks assumes an intermediate sensitivity to ASR (Katayama et al 1989, Katayama 2010bMedeiros et al 2020). Due to their limited abundance in the grain mixture, siliceous limestone, radiolarite and volcanic lithofragments might act as detached (local) deterioration centers during ASR processes.…”

Housing Buildings’ Characterization at Corvo Village (Azores) Historical Center: Towards a Sustainable Rehabilitation Process

“…Located to the west of the Middle Atlantic Ridge and integrated into the North American Plate, the island does not reveal significant effects of seismic action, as other Azores islands do [6]. From the geological point of view, the existing rocks are mainly basalts, trachyte and trachybasalt, tuff (sometimes with palagonite), and volcanic breach [28,31]. Vacuole basalts have sometimes interspersed levels of pyroclastic material composed of cinder, ash, and lapilli in levels [28], as can be observed in the ancient quarry.…”

Special issue on construction aggregates

“…The meeting was held only partly in on-line mode due to restrictions associated with COVID-pandemic; conference/session topic in bold = significant/prevailing number of contributions covering various aspects of construction aggregates, the coverage of aggregate-related issues on other meetings in the list was less significant in concrete Medeiros et al (2020). have shown how modern techniques such as electron probe microscope can help in the discrimination of reactive/non-reactive volcanic rocks from precise measurement of volcanic glass composition.…”