Factors affecting ASR potential of quartzite from a single quarry (Bohemian Massif, Czech Republic)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F13%3A10193089" target="_blank" >RIV/00216208:11310/13:10193089 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Factors affecting ASR potential of quartzite from a single quarry (Bohemian Massif, Czech Republic)

Popis výsledku v původním jazyce

The alkali-silica reaction (ASR) originates under highly alkaline conditions in concrete, where reactive forms of SiO2 react with hydroxyl ions and alkalis, forming alkali-silica gels. Alkali-silica gels tend to absorb water molecules and expand causingdeterioration of the concrete. Quartz, a dominant component of aggregates used in concrete, exhibits variable potentials to cause ASR. This paper aims to quantify the ASR potential of quartzite aggregate sampled from the Těchobuz quarry (Moldanubian Zone, Bohemian Massif, Czech Republic). Various macroscopic and microscopic techniques (image analysis, polarising and electron microscopy, cathodoluminescence) were employed and combined with the accelerated mortar bar test. Slight variations were found inthe ASR potentials of aggregates crushed by different laboratory crushers. Parameters such as particle shape and specific surface were suggested to be responsible for these variations in the ASR potential. A higher ASR potential was measu

Název v anglickém jazyce

Factors affecting ASR potential of quartzite from a single quarry (Bohemian Massif, Czech Republic)

Popis výsledku anglicky

The alkali-silica reaction (ASR) originates under highly alkaline conditions in concrete, where reactive forms of SiO2 react with hydroxyl ions and alkalis, forming alkali-silica gels. Alkali-silica gels tend to absorb water molecules and expand causingdeterioration of the concrete. Quartz, a dominant component of aggregates used in concrete, exhibits variable potentials to cause ASR. This paper aims to quantify the ASR potential of quartzite aggregate sampled from the Těchobuz quarry (Moldanubian Zone, Bohemian Massif, Czech Republic). Various macroscopic and microscopic techniques (image analysis, polarising and electron microscopy, cathodoluminescence) were employed and combined with the accelerated mortar bar test. Slight variations were found inthe ASR potentials of aggregates crushed by different laboratory crushers. Parameters such as particle shape and specific surface were suggested to be responsible for these variations in the ASR potential. A higher ASR potential was measu

Druh

D - Stať ve sborníku

CEP obor

JI - Kompositní materiály

OECD FORD obor

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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

Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název statě ve sborníku

Mineral deposit research for a high-tech world

ISBN

978-91-7403-207-9

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

1833-1836

Název nakladatele

Elanders Sverige AB

Místo vydání

Neuveden

Místo konání akce

Uppsala, Sweden

Datum konání akce

12. 8. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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