PSI - Issue 41

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 il l li t . i i t. tr t r l I t rit r i ( )

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ScienceDirect

Procedia Structural Integrity 41 (2022) 744–751

2 nd Mediterranean Conference on Fracture and Structural Integrity Study of different binders for restoration applications Maria-Evangelia Stogia a , Angeliki-Eirini Dimou a , Stavros K. Kourkoulis b , Nikolaos D. Alexopoulos a* * a University of the Aegean, School of Engineering, Department of Financial Engineering, 821 32 Chios, Greece b National Technical University of Athens, School of Applied Mathematical and Physical Sciences, Department of Mechanics, Laboratory for Testing and Materials, Theocaris Building, Zografou Campus, 157 80 Athens, Greece Abstract Different binders consisting of natural hydraulic lime (NHL5) and metakaolin (MK) and, optionally, white cement (CEM) are examined in the present article. The aim is to produce a material, that will be used in restoration applications and it will be compatible with the original building materials. Thus, in order to assess the performance of these binders, an experimental protocol was implemented, including compression and bending tests. The results showed that metakaolin is an adequate pozzolanic addition for lime mortars, providing adequate mechanical characteristics for application in conservation mortars. The addition of metakaolin improved essentially the mechanical properties of the binder, while the addition of white cement at low concentrations, as a con stituent of the binder, improved further, up to 60 %, the mechanical properties of the previously mentioned mortars. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) i a a K b D. Alexopou a* a i it f t , l f i i , t t f i i l i i , i , b ti l i l i it f t , l f li t ti l i l i , t t f i , t f ti t i l , i il i , f , t , Different binders consisting of natural hydraulic lime (NHL5) and metakaolin (MK) and, optionally, white cement (CEM) are i i t t ti l . i i t t i l, t t ill i t ti li ti it ill ti l it t i i l il i t i l . , i t t t i , i t l t l i l t , i l i i i t t . lt t t t li i t l i iti li t , i i t i l t i ti li ti i ti t . iti t li i ti ll t i l ti t i , il t iti it t t l t ti , tit t t i , i t , t , t i l ti t i l ti t . 2 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc- / . Peer-revi i ilit t t t it . : t r l r li li t ; t li ; i l t t © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. Peer-review under responsibility of the MedFract2 Guest Editors. Keywords: natural hydraulic lime pastes; metakaolin; mechanical tests 1. Introduction Many traditional buildings are suffering from damage due to natural weathering, earthquakes, pollution and urgent ly need restoration interventions. Regarding restoration interventions, the typical materials used are not ordinary cement/ concrete, but mostly stone, limestone and various aggregates. The compatibility between the original building materials i t iti l il i i t t l t i , t , ll ti t l t ti i t ti . i t ti i t ti , t t i l t i l t i t/ t , t tl t , li t i t . ti ilit t t i i l il i t i l .

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2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. 10.1016/j.prostr.2022.05.086