Lime-based mortars with various binder composition: characterization and freeze-thaw resistance assessment

0547395 - ÚTAM 2022 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Janotová, Dana - Slížková, Zuzana
Lime-based mortars with various binder composition: characterization and freeze-thaw resistance assessment.
IOP Conference Series: Materials Science and Engineering. Vol. 1205. Bristol: IOP Publishing, 2021, č. článku 012009. IOP Conference Series. ISSN 1757-8981. E-ISSN 1757-899X.
[International conference building materials, products and technologies. ICBMPT 2021. /24./. Telč (CZ), 29.09.2021-01.10.2021]
Grant CEP: EC(XE) CONSECH20
GRANT EU: European Commission(XE) CONSECH20
Institucionální podpora: RVO:68378297
Klíčová slova: lime mortars * lime binders * hardening
Obor OECD: Materials engineering
https://doi.org/10.1088/1757-899X/1205/1/012009

The study focused on lime mortars with different lime binder types regarding the frost attack effects on their microstructure and mechanical characteristics. The performances of studied mortars in hardened state was significantly influenced by the amount of mixing water and by curing conditions. Inhomogeneous microstructure was observed inside the 360 days old specimens with dimensions 40x40x160 mm in the case of all lime mortars types. The different state of the binder hardening with respect to various distances from the specimen surface and the different behaviour of matured outer part and immature inner part of lime mortar specimens influenced performed tests and reflected in all results. After 10 and 20 freeze cycles, respectively, the compressive strength of all lime mortar specimens with the hydraulic binder component increased, indicating a beneficial effect of the water on the hydration previously unreacted hydraulic binders. On the other hand, the flexural strength of the frost-aged specimens decreased significantly, indicating the drastic procedure of the test performed concerning lime mortars characteristics, especially when the pure air lime binder was used. Improvement of the testing procedure especially for lime mortars, which are characterized by slow hardening, was recommended.
Trvalý link: http://hdl.handle.net/11104/0323630