Design of polymeric binders to improve the properties of magnesium phosphate cement
ČlánekOmezený přístuppeer-reviewedaccepted version (postprint)Datum publikování
2021
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Elsevier Science
Abstrakt
In the context of reducing the environmental impact of cement manufacturing, magnesium phosphate cements raise interest as alternative binders in construction, for immobilization of wastes, and recycling purposes. Their use in applications is somehow limited by short setting time, brittleness and low water resistance; this calls for the use of additives. Two polymer additives were designed adopting emulsion polymerization, an environmentally friendly solution to make available polymers as water-based latex dispersions. The composites containing 5 wt% of polymer, exhibited better elastic behaviour, with up to twice the toughness of the reference sample and of a sample produced with commercial styrene butadiene rubber latex. Moreover, the additives reduced the apparent porosity, promoted phosphate crystallization, modified the size and shape of crystals, and effectively retarded the reaction, extending working time. The acrylic emulsion developing keto-hydrazide self-crosslinking reaction imparted better properties to the composite, thanks to the synergistic effect with the MPC setting reaction. (c) 2021 Elsevier Ltd. All rights reserved.
Rozsah stran
p. 123202
ISSN
0950-0618
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Zdrojový dokument
Construction and Building Materials, volume 290, issue: July
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https://www.sciencedirect.com/science/article/pii/S0950061821009624
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Článek ve verzi „accepted“ bude přístupný od 11.04.2023.
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Klíčová slova
magnesium phosphate cement, acrylic latex, self-crosslinking, emulsion polymerization, hořečnato-fosfátový cement, akrylátový latex, samosíťování, emulzní polymerace