Early-age shrinkage and bond of LC-TRM strengthening in rammed earth

Autor: Rafael Ramírez Eudave, Rui A. Silva, Eduardo Pereira, Antonio Romanazzi
Přispěvatelé: Universidade do Minho
Rok vydání: 2022
Předmět:
Zdroj: Construction and Building Materials. 350:128809
ISSN: 0950-0618
Popis: The wide dissemination of earth-based structures as contemporary, vernacular or heritage constructions in re-gions with important seismic hazard demands the design of solutions that improve the typical low structural performance resulting from intrinsic material limitations. Only in this way, it is possible to promote a comprehensive seismic protection of this heritage and of the life of their inhabitants. One relevant and innovative solution proposed recently to address this problem consists in the strengthening with low-cost textile meshes embedded in a mortar matrix (LC-TRM). The purpose of this solution is similar to that of fibre reinforced polymers (FRP) systems used in masonry structures, where it works as an externally bonded reinforcement. Nevertheless, LC-TRM is addressed to elements constituted by materials with low mechanical properties, such as rammed earth and adobe. The further development of this strengthening solution demands comprehending with detail the interaction between the substrate and the matrix, where the shrinkage behaviour is relevant for the success of the system. The capacity of non-destructive tests based on digital image correlation (DIC) suggest the possibility of using this technique to monitor mortar shrinkage in LC-TRM strengthened rammed earth walls. On this regard, an experimental program was conducted and provided many important conclusions, among which are that DIC provides an adequate monitoring of the shrinkage behaviour of LC-TRM strengthened systems and that the strengthening mesh is a key element for controlling shrinkage development. Additionally, the interaction between the substrate and the LC-TRM system was characterised by the means of pull-off tests, favouring a discussion on the suitability and limitations of these tests on rammed-earth/LC-TRM systems.
This work was partly financed by FEDER funds through the Opera-tional Programme Competitiveness Factors (COMPETE 2020) and by national funds through the Foundation for Science and Technology (FCT) within the scope of project SafEarth-PTDC/ECM-EST/2777/2014 (POCI-01-0145-FEDER-016737) . This research was partly funded by the Portuguese Foundation for Science and Technology (FCT) through the Grant No PD/BD/150385/2019. The funding provided by the Erasmus ELARCH (Euro Latin-America Partnership in Natural Risk mitigation and protection of the Cultural Heritage) 552129-EM-1-2014-1-IT-ERA MUNDUS-EMA21 Program is also gratefully acknowledged.
Databáze: OpenAIRE
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