FOŘT, Jan, Jiří ŠÁL, Martin BÖHM, María Jesús MORALES-CONDE, Manuel Alejandro PEDREÑO-ROJAS a Robert ČERNÝ. Microstructure formation of cement mortars modified by superabsorbent polymers. Polymers. Basel, Switzerland: MDPI, roč. 13, č. 20, s. 1-17, 18 s. ISSN 2073-4360. 2021.
Další formáty:   BibTeX LaTeX RIS
Základní údaje
Originální název Microstructure formation of cement mortars modified by superabsorbent polymers
Autoři FOŘT, Jan (203 Česká republika, garant, domácí), Jiří ŠÁL (203 Česká republika, domácí), Martin BÖHM, María Jesús MORALES-CONDE, Manuel Alejandro PEDREÑO-ROJAS a Robert ČERNÝ.
Vydání Polymers, Basel, Switzerland, MDPI, 2021, 2073-4360.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor 20505 Composites
Stát vydavatele Švýcarsko
Utajení není předmětem státního či obchodního tajemství
WWW URL
Kód RIV RIV/75081431:_____/21:00002200
Organizační jednotka Vysoká škola technická a ekonomická v Českých Budějovicích
Klíčová slova anglicky Cement mortar; Mechanical strength; Porosity; Scanning electron microscopy; Shrinkage; Superabsorbent polymer
Štítky KST3, RIV21, SCOPUS
Změnil Změnila: Mgr. Nikola Petříková, učo 28324. Změněno: 16. 11. 2021 09:50.
Anotace
The utilization of superabsorbent polymers (SAPs) in cement-based materials has been found to be a promising means of mitigating the autogenous propagation of shrinkage and cracks. On the other hand, the undesired effects of SAPs’ application on functional properties, including mechanical strength, microstructure formation, and the evolution of hydration heat are not properly understood, given the variety in SAPs’ characteristics. To contribute to the present state-of-the-art, cement mortars, modified with two grades of SAPs by dosages of 0.3%, 0.6%, and 0.9%, were designed and studied with emphasis on the relationship between the materials’ porosities and mechanical strengths. The obtained results are interpreted by scanning electron microscopy analysis and hydration heat evolution to elucidate the major changes and their driving factors. Besides the benefits associated with the mitigation of autogenous shrinkage, the achieved results point to an adverse effect of supplementation with SAP on mechanical strength at an early age, and an even more pronounced increase at a later age. The employed scanning electron microscopy images, together with mercury-intrusion porosimetry data, depict distortion in the material porosity as a result of the filling of formed voids and the closing of open ends by swelled hydrogels. Only the minor benefit of a greater cross-linking density was obtained by the formation of dense structures and the gains in mechanical strength therefrom.
VytisknoutZobrazeno: 28. 3. 2024 21:12