Abstract
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.
Highlights
Organic admixtures and additives have been used since antiquity for modifying the properties of building mortars
This article presents the research on the pore size distribution and mechanical properties of the lime-metakaolin paste differing in the amount of casein admixture
The porosity increased as a result of air bubbles being introduced in the course of ingredient mixing; The admixture of casein significantly increased the flexural strength of the pastes
Summary
Organic admixtures and additives have been used since antiquity for modifying the properties of building mortars. Egg white, keratin, and casein were used in construction [3]. Many of these practices are still being performed today. Research is conducted to scientifically confirm the beneficial effect of the admixtures used in ancient times on the properties of mortars and concretes. Many studies confirm that the modification of lime, clay, and cement mortars with biopolymers has a positive effect on their various properties [4,5,6,7,8,9,10]
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