An experimental study on the effects of casein protein in unreinforced lime mortar specimens
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Casein, an organic milk protein, existed in masonry mortars from medieval times until the 18th century. It was understood to improve workability of the mortar. Recent mortar conservation projects have proposed its use, however, little information is existent on its effects on strength, a critical property in repair of masonry mortars. Adding 0.25% casein by mass was insufficient to improve flow properties of mortar. It was found that adding 0.5% casein by mass resulted in a flowable mortar, however, a 75% reduction in strength resulted, while bond strength increased, after 56 days. Reducing the water by 18% resulted in a 50% reduction in strength from that observed in the control sample, while maintaining flowable properties. Reducing the water more than 27% yielded a rapid-setting, non-flowable mortar. The addition of casein is a plausible alternative for repointing existing mortar joints. It has favourable flow properties, as well as improved bond strength.
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Copyright © 2019 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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falkjar-anexperimentalstudyontheeffectsofcaseinprotein.pdf | 2023-05-05 | Public | Download |