PSI - Issue 17

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 17 (2019) 1002–1009

ICSI 2019 The 3rd International Conference on Structural Integrity Static Elasticity Modulus Analysis of Coating Mortars Ana Isabel Marques a , João Morais b *, Carlos Santos b , Paulo Morais b , Maria do Rosário Veiga a a Buildings Department, National Laboratory for Civil Engineering (LNEC), Avenida do Brasil, 101, 1700-066, Lisbon, Portugal b Scientific Instrumentation Centre, LNEC, Lisbon, Portugal ICSI 2019 The 3rd International Conference on Structural Integrity Static Elasticity Modulus Analysis of Coating Mortars Ana Isabel Marques a , João Morais b *, Carlos Santos b , Paulo Morais b , Maria do Rosário Veiga a a Buildings Department, National Labora ory for Civil Engineeri g (LNEC), Avenida d Brasil, 101, 1700-066, Lisbon, Portugal b Scientific Instrumentation Centre, LNEC, Lisbon, Portugal Wall coating mortars should have the ability to deform, without critical failure, when subjected to loading actions, thermal cycles or shrinkage of the mortar itself. When the mortar cannot cope with these deformations, internal stresses arise in the coating layer. This can lead to cracking, which is one of the most frequent and damaging anomalies in building facades. To minimize this issue, knowledge of the coating mortar’s modulus of elasticity ( E ) is essential during the design process, in order to achieve proper compatibility between the mortar and the substrate regarding material deformability. There are two approaches to experimentally determine E for coating mortars: static experimental methodologies and dynamic experimental methodologies. For civil engineering applications, the results obtained from static methodologies are more reliable than those obtained with dynamic methodologies. There are several dynamic methodologies available that can be used in this context, like the Resonance Frequency methodology and Ultrasonic methodology, but currently there are relatively few reliable static experimental methodologies for coating mortars. As part of a larger study, this paper briefly describes an improved experimental methodology to determine the static E for mortars and the corresponding data obtained with specimens made from several cement based compositions. In order to validate this methodology, the obtained results are compared with two, well-established, dynamic experimental methodologies. Also in this study, ratios between the obtained static and dynamic E values are presented and analyzed. Wall coating mortars should have the ability to deform, without critical failure, when subjected to loading actions, thermal cycles or shrinkage of the mortar itself. W en the mortar cannot cope with these deformations, internal stresses arise in the coating layer. This can lead to cracking, which is one of the most frequent and damaging anomalies in building facades. To minimize this issue, knowledge of the coating rt r’s modul s of elasticity ( E ) is essential during the design process, in order to achieve prop r compatibility between the mortar and the substrate regarding material deformability. There are two approaches to experimentally determine E f r coating mortars: static experimental methodologies and dynamic experimental methodologies. For civil engineering applications, the results obtained fr m static methodologies are more reliable than those obtained with dynamic methodol gies. There are several dynamic methodologies available that can be used in this context, like the Resonance Frequency methodology and Ultrasonic methodology, but currently there are relatively few reliable static experimental methodologies for coating mortars. As part of a larger study, this paper briefly describes an improved experimental methodology to determine the static E for mortars and the c rresponding data obtained with specimens made from several ceme t based compositions. In order to validate t is methodology, the obtained results are compared with two, well-establishe , dynamic xperimental methodologies. Also in this study, ratios between the obtained static and dynamic E values are presented and analyzed. Abstract Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: cement wall coating mortars; static modulus of elasticity; dynamic modulus of elasticity; static and dynamic ratios Keywords: cement wall coating mortars; static modulus of elasticity; dynamic modulus of elasticity; static and dynamic ratios

* Corresponding author. Tel.: +351-218-443-978; fax: +351-218-443-041. E-mail address: jmorais@lnec.pt * Correspon ing auth r. Tel.: +351-218-443-978; fax: +351-218-443-041. E-mail address: jmorais@lnec.pt

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.09.001