TY  - JOUR
AU  - Rakić, Jelena M.
AU  - Petrović, Rada
AU  - Radojević, Vesna
AU  - Baščarević, Zvezdana D.
PY  - 2024-08
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7496
AB  - This study investigates hydration mechanism of a high volume fly ash (HVFA) binder, comprising 70 wt% of fly ash (FA), chemically activated by using sodium oxalate (Na2C2O4) and calcium formate (Ca(HCOO)2). Prior to the binder synthesis, mechanical activation of FA was employed. Effects of the activators on the properties of the HVFA binders were determined by measuring setting times and compressive strength of the binders. Heat of hydration, pore solution composition, bound water and portlandite content, mineral composition, and microstructure of HVFA binder pastes were analyzed in order to compare the hydration mechanisms of the HVFA binders activated with the selected activators. The obtained results indicated that using of the two different activators led to the enhancement of the properties of the HVFA binders, but it was achieved in two distinct ways. It was found that the use of Ca(HCOO)2 mitigated adverse effects of the high alkalinity of the pore solution of chemically activated HVFA binder on hydration process and strength development in the later period. Therefore, it was concluded that Ca(HCOO)2 was more suitable for chemical activation of HVFA binders, compared to Na2C2O4.
PB  - Elsevier Ltd.
T2  - Journal of Building Engineering
T1  - Use of sodium oxalate and calcium formate for chemical activation of high volume fly ash (HVFA) binders
SP  - 109666
VL  - 91
DO  - 10.1016/j.jobe.2024.109666
ER  - 

@article{
author = "Rakić, Jelena M. and Petrović, Rada and Radojević, Vesna and Baščarević, Zvezdana D.",
year = "2024-08",
abstract = "This study investigates hydration mechanism of a high volume fly ash (HVFA) binder, comprising 70 wt% of fly ash (FA), chemically activated by using sodium oxalate (Na2C2O4) and calcium formate (Ca(HCOO)2). Prior to the binder synthesis, mechanical activation of FA was employed. Effects of the activators on the properties of the HVFA binders were determined by measuring setting times and compressive strength of the binders. Heat of hydration, pore solution composition, bound water and portlandite content, mineral composition, and microstructure of HVFA binder pastes were analyzed in order to compare the hydration mechanisms of the HVFA binders activated with the selected activators. The obtained results indicated that using of the two different activators led to the enhancement of the properties of the HVFA binders, but it was achieved in two distinct ways. It was found that the use of Ca(HCOO)2 mitigated adverse effects of the high alkalinity of the pore solution of chemically activated HVFA binder on hydration process and strength development in the later period. Therefore, it was concluded that Ca(HCOO)2 was more suitable for chemical activation of HVFA binders, compared to Na2C2O4.",
publisher = "Elsevier Ltd.",
journal = "Journal of Building Engineering",
title = "Use of sodium oxalate and calcium formate for chemical activation of high volume fly ash (HVFA) binders",
pages = "109666",
volume = "91",
doi = "10.1016/j.jobe.2024.109666"
}

Rakić, J. M., Petrović, R., Radojević, V.,& Baščarević, Z. D.. (2024-08). Use of sodium oxalate and calcium formate for chemical activation of high volume fly ash (HVFA) binders. in Journal of Building Engineering
Elsevier Ltd.., 91, 109666.
https://doi.org/10.1016/j.jobe.2024.109666

Rakić JM, Petrović R, Radojević V, Baščarević ZD. Use of sodium oxalate and calcium formate for chemical activation of high volume fly ash (HVFA) binders. in Journal of Building Engineering. 2024;91:109666.
doi:10.1016/j.jobe.2024.109666 .

Rakić, Jelena M., Petrović, Rada, Radojević, Vesna, Baščarević, Zvezdana D., "Use of sodium oxalate and calcium formate for chemical activation of high volume fly ash (HVFA) binders" in Journal of Building Engineering, 91 (2024-08):109666,
https://doi.org/10.1016/j.jobe.2024.109666 . .

TY  - JOUR
AU  - Rakić, Jelena M.
AU  - Petrović, Rada D.
AU  - Radojević, Vesna J.
AU  - Baščarević, Zvezdana D.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6458
AB  - Effects of Na2SO4, Na2CO3, and Na2SiO3 on setting time, compressive strength (up to 90 days), and hydration mechanism of binders with high volume (70 wt%, HVFA binders) of fly ash (FA) were investigated. Before chemical activation, FA was mechanically activated. Effects of the activators on hydration process were examined by isothermal calorimetry, X-ray diffraction and thermogravimetric analyses, and scanning electron microscopy. Pore solution analyses were also performed. It was found that, with addition of the chemical activators, Portland cement (PC) hydration was accelerated and the pozzolanic reaction started earlier, which resulted in shortening of setting time and increase in early compressive strength of the HVFA binders. Combination of mechanical activation of FA and the chemical activation by sodium silicate proved to be the best choice for synthesis of HVFA binder with good physicomechanical properties.
PB  - Elsevier Ltd.
T2  - Construction and Building Materials
T1  - Effects of selected inorganic chemical activators on properties and hydration mechanism of high volume fly ash (HVFA) binders
SP  - 131833
VL  - 391
DO  - 10.1016/j.conbuildmat.2023.131833
ER  - 

@article{
author = "Rakić, Jelena M. and Petrović, Rada D. and Radojević, Vesna J. and Baščarević, Zvezdana D.",
year = "2023",
abstract = "Effects of Na2SO4, Na2CO3, and Na2SiO3 on setting time, compressive strength (up to 90 days), and hydration mechanism of binders with high volume (70 wt%, HVFA binders) of fly ash (FA) were investigated. Before chemical activation, FA was mechanically activated. Effects of the activators on hydration process were examined by isothermal calorimetry, X-ray diffraction and thermogravimetric analyses, and scanning electron microscopy. Pore solution analyses were also performed. It was found that, with addition of the chemical activators, Portland cement (PC) hydration was accelerated and the pozzolanic reaction started earlier, which resulted in shortening of setting time and increase in early compressive strength of the HVFA binders. Combination of mechanical activation of FA and the chemical activation by sodium silicate proved to be the best choice for synthesis of HVFA binder with good physicomechanical properties.",
publisher = "Elsevier Ltd.",
journal = "Construction and Building Materials",
title = "Effects of selected inorganic chemical activators on properties and hydration mechanism of high volume fly ash (HVFA) binders",
pages = "131833",
volume = "391",
doi = "10.1016/j.conbuildmat.2023.131833"
}

Rakić, J. M., Petrović, R. D., Radojević, V. J.,& Baščarević, Z. D.. (2023). Effects of selected inorganic chemical activators on properties and hydration mechanism of high volume fly ash (HVFA) binders. in Construction and Building Materials
Elsevier Ltd.., 391, 131833.
https://doi.org/10.1016/j.conbuildmat.2023.131833

Rakić JM, Petrović RD, Radojević VJ, Baščarević ZD. Effects of selected inorganic chemical activators on properties and hydration mechanism of high volume fly ash (HVFA) binders. in Construction and Building Materials. 2023;391:131833.
doi:10.1016/j.conbuildmat.2023.131833 .

Rakić, Jelena M., Petrović, Rada D., Radojević, Vesna J., Baščarević, Zvezdana D., "Effects of selected inorganic chemical activators on properties and hydration mechanism of high volume fly ash (HVFA) binders" in Construction and Building Materials, 391 (2023):131833,
https://doi.org/10.1016/j.conbuildmat.2023.131833 . .