Impact of light mica on the intensity of the alkali-silica reactions in cement concrete pavements containing cataclased granite aggregates

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44994575%3A_____%2F24%3A10001923" target="_blank" >RIV/44994575:_____/24:10001923 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/24:00137366

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2214509524006727?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2214509524006727?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cscm.2024.e03521" target="_blank" >10.1016/j.cscm.2024.e03521</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Impact of light mica on the intensity of the alkali-silica reactions in cement concrete pavements containing cataclased granite aggregates

Popis výsledku v původním jazyce

The main goal was to determine the reaction potential of alkali-reactive aggregates containingunstable and metastable K-silicates together with quartz (predominant SiO2 polymorph) foralkali-silica reactions (ASR) in cement concrete pavements. Current methods used to determinethe expansion potential of aggregates do not solve these problems. The study of mineral paragenesisof cataclased granite by the SEM/EDX method shows that the differences in the microstructuraland microchemical composition of ASR products in the cement matrix reflect themineral variability of the rocks. The final products (crystals alkali-calcium aqueous silicates (NK)CSH), formed from alkali-silica gel (ASG), not only have different K2O contents, but analysis ofinternal and external ASG led to the finding that the K2O content is highest in cataclased graniteswith polymineral paragenesis (K-feldspar, light mica, quartz). The monomineral cataclasedgranite aggregate (crushed quartz only), its outer edge and air-voids have a significantly lower Kcontent. The highest K2O contents and at the same time lower CaO content were identified inASGs appearing in paragenesis with light mica, and crushed feldspars. Based on the results presentedin this work, it can be concluded that the presence of transformed feldspars and light micasignificantly affect both the microchemical composition of ASR products and their crystallineproduct morphology.

Název v anglickém jazyce

Impact of light mica on the intensity of the alkali-silica reactions in cement concrete pavements containing cataclased granite aggregates

Popis výsledku anglicky

The main goal was to determine the reaction potential of alkali-reactive aggregates containingunstable and metastable K-silicates together with quartz (predominant SiO2 polymorph) foralkali-silica reactions (ASR) in cement concrete pavements. Current methods used to determinethe expansion potential of aggregates do not solve these problems. The study of mineral paragenesisof cataclased granite by the SEM/EDX method shows that the differences in the microstructuraland microchemical composition of ASR products in the cement matrix reflect themineral variability of the rocks. The final products (crystals alkali-calcium aqueous silicates (NK)CSH), formed from alkali-silica gel (ASG), not only have different K2O contents, but analysis ofinternal and external ASG led to the finding that the K2O content is highest in cataclased graniteswith polymineral paragenesis (K-feldspar, light mica, quartz). The monomineral cataclasedgranite aggregate (crushed quartz only), its outer edge and air-voids have a significantly lower Kcontent. The highest K2O contents and at the same time lower CaO content were identified inASGs appearing in paragenesis with light mica, and crushed feldspars. Based on the results presentedin this work, it can be concluded that the presence of transformed feldspars and light micasignificantly affect both the microchemical composition of ASR products and their crystallineproduct morphology.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Case Studies in Construction Materials

ISSN

2214-5095

e-ISSN

2214-5095

Svazek periodika

neuveden

Číslo periodika v rámci svazku

21

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

24

Strana od-do

1-24

Kód UT WoS článku

001281373100001

EID výsledku v databázi Scopus

2-s2.0-85199362326