An integrated experimental-numerical study of the performance of lime-based mortars in masonry piers under eccentric loading

Abstract

Architectural conservation and repair are becoming increasingly important issues in many countries due to numerous prior improper interventions, including the use of inappropriate repair materials over time. As a result, the composition of repair masonry mortars is now being more frequently addressed in mortar research. Just recently, for example, it has become apparent that Portland cement mortars, extensively exploited as repair mortars over the past few decades, are not suitable for repair because of their chemical, physical, mechanical, and aesthetic incompatibilities with original materials. This paper focuses on the performance of various lime-based alternative materials intended for application in repairing historic structures when subjected to mechanical loading. Results of basic material tests indicate that the use of metakaolin as a pozzolanic additive produces mortars with superior strength and sufficiently low shrinkage. Moreover, mortar strength can be further enhanced by the addition of crushed brick fragments, which explains the longevity of Roman concretes rich in pozzolans and aggregates from crushed clay products such as tiles, pottery, or bricks. An integrated experimentalnumerical approach was used to identify key mortar parameters influencing the load-bearing capacity of masonry piers subjected to a combination of compression and bending. The simulations indicate increased load-bearing capacities for masonry piers containing metakaolin-rich mortars with crushed brick fragments, as a result of their superior compressive strength.

Modelagem Em Método Dos Elementos Finitos Para Estudo Da Resistência À Compressão De Argamassas De Múltiplo Uso.

“…Assim, através da imposição de condições de contorno, que representam os carregamentos aplicados ao domínio original e as vinculações externas, é possível obter as respostas de deformação e de tensão em todo o domínio do problema definido no início da modelagem [4]. Diversas pesquisas já foram desenvolvidas no campo da engenharia de materiais com o intuito de estudar a correlação de parâmetros experimentais, obtidos através de experimentação em corpos de prova, com os parâmetros obtidos através de modelagens matemáticas [5][6][7][8]. Nesse contexto, o objetivo desse trabalho foi verificar a correlação dos parâmetros de resistência à compressão de argamassas de múltiplo uso convencionais obtidas por procedimento experimental e o mesmo parâmetro obtido por modelagem matemática utilizado o método dos elementos finitos.…”

Assessment of the Compressive Strength of Lime Mortars with Admixtures, Subjected to Two Curing Environments

“…On the other hand, there are some inconveniences when using lime binders, such as low strength, slow hardening, poor water resistance, high retraction, and low cohesion between the mortars and the masonry units (Vavričuk et al, 2018;Zhang et al, 2018). To mitigate these problems, admixtures rich in aluminum-silicates such as metakaolin or brick dust are employed (Nežerka et al, 2016).…”

Study of the Compressive Strength of Mortars as a Function of Material Composition, Workability, and Specimen Geometry

“…Several works have studied the correlation of experimental parameters obtained through experimentation data, with parameters obtained by means of mathematical modeling [11][12][13][14].…”