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Nano-Tio2 in hydraulic lime-metakaolin mortars for restoration projects: physicochemical and mechanical assessment

Kapetanaki Kali, Kapridaki Chrysi, Maravelaki Pagona

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URIhttp://purl.tuc.gr/dl/dias/82C4D6C9-31D0-4200-B698-A2C5FC5EA312-
Αναγνωριστικόhttps://doi.org/10.3390/buildings9110236-
Αναγνωριστικόhttps://www.mdpi.com/2075-5309/9/11/236-
Γλώσσαen-
Μέγεθος10 pagesen
ΤίτλοςNano-Tio2 in hydraulic lime-metakaolin mortars for restoration projects: physicochemical and mechanical assessmenten
ΔημιουργόςKapetanaki Kalien
ΔημιουργόςΚαπετανακη Καληel
ΔημιουργόςKapridaki Chrysien
ΔημιουργόςΚαπριδακη Χρυσηel
ΔημιουργόςMaravelaki Pagonaen
ΔημιουργόςΜαραβελακη Παγωναel
ΕκδότηςMDPIen
ΠερίληψηIn recent years, lime mortars mixed with artificial or natural pozzolans are commonly used in restoration applications. The aim of this work is the assessment of carbonation, pozzolanic reaction, setting time, and mechanical properties of metakaolin-lime mortars mixed with crystalline nano-titania (nT) as additive. The studied mortars consist of hydrated lime and metakaolin in 60/40 ratio (wt%) and fine aggregates of either carbonate or silicate sand. The concentration of the nano-titania is equal to 6 (wt%) of the binder. For comparison purposes, three types of mortars and pastes are designed: Without the addition of nano-titania, with nT activated or not under UV irradiation. The evaluation of the carbonation and pozzolanic reaction over a 1.5-year curing period is carried out through thermal analysis (DTA/TG), infrared spectroscopy (FTIR) and X-ray diffraction analysis (XRD). The uniaxial compression and the three-point bending tests at 28 days, 3 months, and 6 months were carried out to evaluate mechanical properties. The addition of activated nano-titania, due to an increased photocatalytic activity, accelerated the setting of the mortars, improving at the same time the mechanical properties. The plastic behavior of the lime-metakaolin mortars with activated nT was attributed to the evolution of carbonation and pozzolanic reaction.en
ΤύποςPeer-Reviewed Journal Publicationen
ΤύποςΔημοσίευση σε Περιοδικό με Κριτέςel
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2020-04-06-
Ημερομηνία Δημοσίευσης2019-
Θεματική ΚατηγορίαCarbonationen
Θεματική ΚατηγορίαLime-metakaolin mortarsen
Θεματική ΚατηγορίαNano-TiO2en
Θεματική ΚατηγορίαPozzolanic reactionen
Θεματική ΚατηγορίαSetting timeen
Βιβλιογραφική ΑναφοράK. Kapetanaki, C. Kapridaki and P.-N. Maravelaki, "Nano-Tio2 in hydraulic lime-metakaolin mortars for restoration projects: physicochemical and mechanical assessment," Buildings, vol. 9, no. 11, Nov. 2019. doi: 10.3390/buildings9110236en

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