Microstructure and ecotoxicological response of Portland cement composites incorporating coal fly ash

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F25%3A00386366" target="_blank" >RIV/68407700:21110/25:00386366 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/25:43932737 RIV/60461373:22330/25:43932737

Výsledek na webu

<a href="https://doi.org/10.1016/j.rineng.2025.108364" target="_blank" >https://doi.org/10.1016/j.rineng.2025.108364</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.rineng.2025.108364" target="_blank" >10.1016/j.rineng.2025.108364</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure and ecotoxicological response of Portland cement composites incorporating coal fly ash

Popis výsledku v původním jazyce

Utilization of coal fly ash (FA) as a Portland cement (PC) admixture offers a promising yet underexplored approach to reduce PC’s environmental impact and enable sustainable reuse of industrial by-products. This study addresses the gap concerning the technical performance and environmental safety of FA-containing binders (PC-FA). FA characterization via XRD, XRF, EDS, and SEM revealed dominant crystalline phases (quartz, mullite, magnetite, rutile) and a heterogeneous microstructure. Incorporating 10 wt.% and 20 wt.% FA into PC produced denser matrices, refined microstructures, and enhanced pozzolanic activity without compromising mortar integrity (compactness, absence of microcracks, voids and segregation). Bioassays at environmentally relevant concentrations (1 g/L, 0.1 g/L, 0.01 g/L) were carried out on prokaryotic (Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa) and eukaryotic (Desmodesmus subspicatus, Artemia salina, Sinapis alba) models. No significant inhibition of bacterial growth was observed. Biofilm formation on all PC surfaces was significantly lower than on polystyrene (reference), with strain-specific effects: FA increased S. aureus biofilm formation, while E. coli and P. aeruginosa formed less biofilm on FA-doped samples than on PC-REF by up to 2 log10(CFU/cm2). FTIR of PC composites incubated with E. coli indicated reduced portlandite and calcite contents, suggesting a lower internal pH and possible chemical disruption under bacteria-favouring conditions. Low toxicity (<10 %) of FA or PC-FA toward D. subspicatus and A. salina was determined. Low phytotoxicity (~70 % germination index) was observed in S. alba at high exposure (1 g/L) for all PC types, without FA-related effect. These results support PC-FA´s´ potential in sustainable construction applications.

Název v anglickém jazyce

Microstructure and ecotoxicological response of Portland cement composites incorporating coal fly ash

Popis výsledku anglicky

Utilization of coal fly ash (FA) as a Portland cement (PC) admixture offers a promising yet underexplored approach to reduce PC’s environmental impact and enable sustainable reuse of industrial by-products. This study addresses the gap concerning the technical performance and environmental safety of FA-containing binders (PC-FA). FA characterization via XRD, XRF, EDS, and SEM revealed dominant crystalline phases (quartz, mullite, magnetite, rutile) and a heterogeneous microstructure. Incorporating 10 wt.% and 20 wt.% FA into PC produced denser matrices, refined microstructures, and enhanced pozzolanic activity without compromising mortar integrity (compactness, absence of microcracks, voids and segregation). Bioassays at environmentally relevant concentrations (1 g/L, 0.1 g/L, 0.01 g/L) were carried out on prokaryotic (Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa) and eukaryotic (Desmodesmus subspicatus, Artemia salina, Sinapis alba) models. No significant inhibition of bacterial growth was observed. Biofilm formation on all PC surfaces was significantly lower than on polystyrene (reference), with strain-specific effects: FA increased S. aureus biofilm formation, while E. coli and P. aeruginosa formed less biofilm on FA-doped samples than on PC-REF by up to 2 log10(CFU/cm2). FTIR of PC composites incubated with E. coli indicated reduced portlandite and calcite contents, suggesting a lower internal pH and possible chemical disruption under bacteria-favouring conditions. Low toxicity (<10 %) of FA or PC-FA toward D. subspicatus and A. salina was determined. Low phytotoxicity (~70 % germination index) was observed in S. alba at high exposure (1 g/L) for all PC types, without FA-related effect. These results support PC-FA´s´ potential in sustainable construction applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Results in Engineering

ISSN

2590-1230

e-ISSN

—

Svazek periodika

28

Číslo periodika v rámci svazku

108364

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

—

Kód UT WoS článku

001633402000004

EID výsledku v databázi Scopus

2-s2.0-105023587363