Enhancing Functional Properties and Mold Resistance of Gypsum Plasters with Caffeine
Caffeine is a proven bioactive substance against fungi for internal use, without any observed negative effects on properties of wood materials. However, its addition to other building materials for internal use has not yet been tested. For this reason, the effects of caffeine’s addition on selected...
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MDPI AG
2024-10-01
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| author | Klára Kobetičová Jitka Krejsová Martin Keppert Vojtěch Pommer Ivana Burianová Martin Böhm Robert Černý |
| author_facet | Klára Kobetičová Jitka Krejsová Martin Keppert Vojtěch Pommer Ivana Burianová Martin Böhm Robert Černý |
| author_sort | Klára Kobetičová |
| collection | DOAJ |
| description | Caffeine is a proven bioactive substance against fungi for internal use, without any observed negative effects on properties of wood materials. However, its addition to other building materials for internal use has not yet been tested. For this reason, the effects of caffeine’s addition on selected properties of gypsum plasters were studied. Two experimental approaches were applied in the present study: (A) using an aqueous caffeine solution (20 g/L) for the preparation of gypsum plaster; and (B) immersing the gypsum plaster in the same caffeine concentration. The results showed a significant increase in the compressive strength of the plaster after 7 days of curing in laboratory conditions (variant A—46%, variant B—16%). The application of caffeine led to a substantial improvement in the water resistance of gypsum. Gypsum plasters were also exposed to a mixture of air molds. The plasters directly mixed with caffeine were about 72% less attacked by molds than the control, while immersed samples showed only a 20% reduction in mold coverage. The main conclusions of the study are that caffeine is a suitable additive for the improvement of gypsum’s compressive strength, and its addition leads to a higher resistance of gypsum against humidity and mold attacks. |
| format | Article |
| id | doaj-art-43808dd958404cdb9282e499b2e0e40b |
| institution | OA Journals |
| issn | 2075-5309 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj-art-43808dd958404cdb9282e499b2e0e40b2025-08-20T02:28:11ZengMDPI AGBuildings2075-53092024-10-011411349410.3390/buildings14113494Enhancing Functional Properties and Mold Resistance of Gypsum Plasters with CaffeineKlára Kobetičová0Jitka Krejsová1Martin Keppert2Vojtěch Pommer3Ivana Burianová4Martin Böhm5Robert Černý6Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicCaffeine is a proven bioactive substance against fungi for internal use, without any observed negative effects on properties of wood materials. However, its addition to other building materials for internal use has not yet been tested. For this reason, the effects of caffeine’s addition on selected properties of gypsum plasters were studied. Two experimental approaches were applied in the present study: (A) using an aqueous caffeine solution (20 g/L) for the preparation of gypsum plaster; and (B) immersing the gypsum plaster in the same caffeine concentration. The results showed a significant increase in the compressive strength of the plaster after 7 days of curing in laboratory conditions (variant A—46%, variant B—16%). The application of caffeine led to a substantial improvement in the water resistance of gypsum. Gypsum plasters were also exposed to a mixture of air molds. The plasters directly mixed with caffeine were about 72% less attacked by molds than the control, while immersed samples showed only a 20% reduction in mold coverage. The main conclusions of the study are that caffeine is a suitable additive for the improvement of gypsum’s compressive strength, and its addition leads to a higher resistance of gypsum against humidity and mold attacks.https://www.mdpi.com/2075-5309/14/11/3494caffeinegypsumstrengthmoldsplasters |
| spellingShingle | Klára Kobetičová Jitka Krejsová Martin Keppert Vojtěch Pommer Ivana Burianová Martin Böhm Robert Černý Enhancing Functional Properties and Mold Resistance of Gypsum Plasters with Caffeine Buildings caffeine gypsum strength molds plasters |
| title | Enhancing Functional Properties and Mold Resistance of Gypsum Plasters with Caffeine |
| title_full | Enhancing Functional Properties and Mold Resistance of Gypsum Plasters with Caffeine |
| title_fullStr | Enhancing Functional Properties and Mold Resistance of Gypsum Plasters with Caffeine |
| title_full_unstemmed | Enhancing Functional Properties and Mold Resistance of Gypsum Plasters with Caffeine |
| title_short | Enhancing Functional Properties and Mold Resistance of Gypsum Plasters with Caffeine |
| title_sort | enhancing functional properties and mold resistance of gypsum plasters with caffeine |
| topic | caffeine gypsum strength molds plasters |
| url | https://www.mdpi.com/2075-5309/14/11/3494 |
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