The Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste

Biopolymers based on proteins are applied in the building materials technology to modify and improve their selected properties. These polymers are designed as natural admixtures that improve the workability of materials. Casein is an example of a protein-based organic polymer. It is a protein obtain...

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Autores principales:	Przemysław Brzyski, Zbigniew Suchorab, Grzegorz Łagód
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	casein protein lime metakaolin flexural and compressive strengths porosity Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/175f2eb6ee564903be8a652a136d4d20
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spelling	oai:doaj.org-article:175f2eb6ee564903be8a652a136d4d202021-11-25T16:59:52ZThe Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste10.3390/buildings111105302075-5309https://doaj.org/article/175f2eb6ee564903be8a652a136d4d202021-11-01T00:00:00Zhttps://www.mdpi.com/2075-5309/11/11/530https://doaj.org/toc/2075-5309Biopolymers based on proteins are applied in the building materials technology to modify and improve their selected properties. These polymers are designed as natural admixtures that improve the workability of materials. Casein is an example of a protein-based organic polymer. It is a protein obtained from cow’s milk. The paper aimed at investigating the prospects of enhancing the strength properties of a binder prepared on a basis of metakaolin and hydrated lime. The mix was modified with powdered technical casein at 0.5%, 1%, 3%, and 5% as a partial replacement for the binder mix by mass. The study involved investigating the effect of the applied natural admixture on the flexural and compressive strengths, as well as pore size distribution. The average pore diameter decreased in the recipes with casein in the amount of 0.5% and 1%, while it increased when the amount of casein equaled 3% and 5%. Only the 0.5% casein admixture caused a decrease in the total porosity. The results show a clear dependence of the strength parameters on porosity. The admixture of casein significantly increased the flexural strength of the pastes, and decreased the compressive strength. The highest increase in flexural strength (by 205.7%) was caused by the admixture of 0.5% casein, while the greatest decrease in compressive strength (by 28%) was caused by the 3% casein admixture. The flexural strength was enhanced, i.a., due to the improved adhesion and mutual bonding of lime particles, resulting from the application of a sticky admixture. No notable difference was indicated during carbonation by the phenolphthalein test. The lime binder is characterized by a slow setting process and low mechanical strength. The results of the research showed the possibility of improving the flexural strength using small amounts of natural admixture, which may broaden the scope of application of this binder.Przemysław BrzyskiZbigniew SuchorabGrzegorz ŁagódMDPI AGarticlecaseinproteinlimemetakaolinflexural and compressive strengthsporosityBuilding constructionTH1-9745ENBuildings, Vol 11, Iss 530, p 530 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	casein protein lime metakaolin flexural and compressive strengths porosity Building construction TH1-9745
spellingShingle	casein protein lime metakaolin flexural and compressive strengths porosity Building construction TH1-9745 Przemysław Brzyski Zbigniew Suchorab Grzegorz Łagód The Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste
description	Biopolymers based on proteins are applied in the building materials technology to modify and improve their selected properties. These polymers are designed as natural admixtures that improve the workability of materials. Casein is an example of a protein-based organic polymer. It is a protein obtained from cow’s milk. The paper aimed at investigating the prospects of enhancing the strength properties of a binder prepared on a basis of metakaolin and hydrated lime. The mix was modified with powdered technical casein at 0.5%, 1%, 3%, and 5% as a partial replacement for the binder mix by mass. The study involved investigating the effect of the applied natural admixture on the flexural and compressive strengths, as well as pore size distribution. The average pore diameter decreased in the recipes with casein in the amount of 0.5% and 1%, while it increased when the amount of casein equaled 3% and 5%. Only the 0.5% casein admixture caused a decrease in the total porosity. The results show a clear dependence of the strength parameters on porosity. The admixture of casein significantly increased the flexural strength of the pastes, and decreased the compressive strength. The highest increase in flexural strength (by 205.7%) was caused by the admixture of 0.5% casein, while the greatest decrease in compressive strength (by 28%) was caused by the 3% casein admixture. The flexural strength was enhanced, i.a., due to the improved adhesion and mutual bonding of lime particles, resulting from the application of a sticky admixture. No notable difference was indicated during carbonation by the phenolphthalein test. The lime binder is characterized by a slow setting process and low mechanical strength. The results of the research showed the possibility of improving the flexural strength using small amounts of natural admixture, which may broaden the scope of application of this binder.
format	article
author	Przemysław Brzyski Zbigniew Suchorab Grzegorz Łagód
author_facet	Przemysław Brzyski Zbigniew Suchorab Grzegorz Łagód
author_sort	Przemysław Brzyski
title	The Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste
title_short	The Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste
title_full	The Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste
title_fullStr	The Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste
title_full_unstemmed	The Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste
title_sort	influence of casein protein admixture on pore size distribution and mechanical properties of lime-metakaolin paste
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/175f2eb6ee564903be8a652a136d4d20
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The Influence of Casein Protein Admixture on Pore Size Distribution and Mechanical Properties of Lime-Metakaolin Paste

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