Evaluation of alkali-silica reaction potential of quartz-rich rocks by alkaline etching of polished rock sections

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F16%3A10327534" target="_blank" >RIV/00216208:11310/16:10327534 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s12665-016-5519-3" target="_blank" >http://dx.doi.org/10.1007/s12665-016-5519-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s12665-016-5519-3" target="_blank" >10.1007/s12665-016-5519-3</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of alkali-silica reaction potential of quartz-rich rocks by alkaline etching of polished rock sections

Popis výsledku v původním jazyce

Rock sections mainly composed of quartz (coming from orthoquartzite, quartz metagreywacke, pegmatite quartz, vein quartz, chert, and flint) were subjected to experimental etching in 1 M NaOH solution at 80 degrees C. After 4 h-14 days, the rock sections were analysed using a scanning electron microscopy (SEM) combined with energy-dispersive spectrometer. Representative areas were documented in backscattering mode and analysed using fully automatic petrographic image analysis (PIA). Specific features connected to alkaline etching were observed on the surface of the rock sections: dissolution gaps, accentuation of pre-existing microcracks, etched out parts of aggregates, and the formation of altered silica-rich layer, and alkalisilica gels, all influencing the greyscale spectrum of the BSE microphotographs. Using SEM-PIA, it was possible to quantify the area affected by alkaline etching (etched area) and to express it as a percentage of the total area analysed. A very good correlation was found between the etched area and alkali-silica reaction potential of investigated rocks measured according to an accelerated mortar bar test.

Název v anglickém jazyce

Evaluation of alkali-silica reaction potential of quartz-rich rocks by alkaline etching of polished rock sections

Popis výsledku anglicky

Rock sections mainly composed of quartz (coming from orthoquartzite, quartz metagreywacke, pegmatite quartz, vein quartz, chert, and flint) were subjected to experimental etching in 1 M NaOH solution at 80 degrees C. After 4 h-14 days, the rock sections were analysed using a scanning electron microscopy (SEM) combined with energy-dispersive spectrometer. Representative areas were documented in backscattering mode and analysed using fully automatic petrographic image analysis (PIA). Specific features connected to alkaline etching were observed on the surface of the rock sections: dissolution gaps, accentuation of pre-existing microcracks, etched out parts of aggregates, and the formation of altered silica-rich layer, and alkalisilica gels, all influencing the greyscale spectrum of the BSE microphotographs. Using SEM-PIA, it was possible to quantify the area affected by alkaline etching (etched area) and to express it as a percentage of the total area analysed. A very good correlation was found between the etched area and alkali-silica reaction potential of investigated rocks measured according to an accelerated mortar bar test.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JI - Kompositní materiály

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP104%2F12%2F0915" target="_blank" >GAP104/12/0915: Kvantitativní analýza deformačních struktur křemene ovlivňujících vznik ASR v betonu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Environmental Earth Sciences

ISSN

1866-6280

e-ISSN

—

Svazek periodika

75

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

14

Strana od-do

—

Kód UT WoS článku

000376030100007

EID výsledku v databázi Scopus

2-s2.0-84964546327