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MELICHAR, J. ČERNÝ, V. MÉSZÁROSOVÁ, L. DROCHYTKA, R. DUFKA, A. FIGALA, P. BARÁNEK, Š.
Originální název
Study of synergistic effect of fly ash and superabsorbent polymers on properties of cement pastes
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
angličtina
Originální abstrakt
The main goal of this study is to observe changes in microstructural properties and the mutual interaction of cement pastes containing superabsorbent polymers (SAPs) and fly ash. SAP is a type of hydrogel additive, able to absorb large amounts of liquid in its structure. In cement-based materials, it is often used in the early stages of matrix hydration to absorb excess mixing water and to release it in the later stages, which is even more desirable when the material is exposed to higher temperatures. Another research goal is a partial substitution of binder (Portland cement) by the energy by-product of high-temperature ash, produced by the combustion of brown coal. A further goal is the observation of the interactions of these binders with the SAPs on the microstructural scale. For this purpose, computed tomography (CT), X-ray diffraction (XRD), differential thermal analysis (DTA), and scanning electron microscopy (SEM) were performed. Basic physical and mechanical properties such as compressive strength, flexural strength, and bulk density were also determined. In the early stages of hydration, viscosity and chemical shrinkage were determined. From the results obtained, it is obvious that the presence of SAPs has a significant impact on the properties of cement pastes. From the two tested SAPs, SAP HM has a positive effect on volume stability and the flexural strength of the composite. The results of the mineralogical composition showed that the effect of SAP incorporation influences the crystallization of portlandite, alite, belite, and calcite. SEM analysis confirmed the results of XRD analysis and proved that hydration products can grow into SAP cavities. It is clear from the evaluation of the pore structure that SAPs increase the porosity of cement composites. The admixture of high-temperature fly ash has a positive effect on reducing the volumetric changes of mixtures. The mechanical parameters of the composite with fly ash were similar to that of the reference test specimens.
Klíčová slova
Superabsorbent polymers; Cement pastes; Fly ash; Study of microstructure
Autoři
MELICHAR, J.; ČERNÝ, V.; MÉSZÁROSOVÁ, L.; DROCHYTKA, R.; DUFKA, A.; FIGALA, P.; BARÁNEK, Š.
Vydáno
17. 10. 2023
Nakladatel
Elsevier
Místo
AMSTERDAM, NETHERLANDS
ISSN
2352-7102
Periodikum
Journal of Building Engineering
Ročník
79
Číslo
107897
Stát
Nizozemsko
Strany od
1
Strany do
20
Strany počet
URL
https://authors.elsevier.com/c/1hxKs8MyS96aBe
BibTex
@article{BUT184930, author="Jindřich {Melichar} and Vít {Černý} and Lenka {Mészárosová} and Rostislav {Drochytka} and Amos {Dufka} and Petr {Figala} and Šimon {Baránek}", title="Study of synergistic effect of fly ash and superabsorbent polymers on properties of cement pastes", journal="Journal of Building Engineering", year="2023", volume="79", number="107897", pages="20", doi="10.1016/j.jobe.2023.107897", issn="2352-7102", url="https://authors.elsevier.com/c/1hxKs8MyS96aBe" }