Abstract
The paper presents the results of an experimental campaign on the confinement of masonry square columns with fiber-reinforced lime mortar (FRLM) composites made of a natural lime-based matrix. The experimental results show the effectiveness of such a composite for increasing both strength and ductility performances of strengthened columns. Predictive formulas from the literature and from the Italian guidelines CNR-DT 215/2018 do not perfectly fit the experimental outcomes and do not confirm the strength increase of the confined columns. The reason can be attributed to the very low mechanical properties of the natural matrix used to form such a composite. Therefore, considering that the use of a natural and sustainable matrix fully compatible with the masonry substrate is a fundamental requirement for strengthening masonry columns of buildings belonging to architectural heritage, an additional future effort should be made by researchers involved in this field. In particular, for a reliable prediction of the strength of masonry columns confined with composites made of natural matrices, wider experimental campaigns are necessary to refine available formulas with respect to different substrates and component materials.
Highlights
Masonry buildings constitute a large part of world historical heritage
The strengthening of masonry columns using FRCM composites has been replacing the one based on forced relationship polymer (FRP) composites
In the literature [20], innovative techniques to make the confinement of masonry columns by FRP composites wrapping reversible, based on the interposition of separating films between the column and the jacket, have been proposed, but the problems related to low breathability persist
Summary
Masonry buildings constitute a large part of world historical heritage. Particular attention has always been devoted to the study of their state of conservation and their response to seismic activity through in situ investigations as well as analytical-numerical models [1,2,3,4]. In case of seismic events or with load increases, these masonry elements show extreme vulnerability [5,6]; this phenomenon is often fostered by the natural deterioration of the original material properties. These architectural elements enrich the masonry, helping to enhance its aesthetic and typological character. In this context, the neoclassical architectures—for example, the well-known buildings of Palladio—as well as the common and more recent masonry buildings that characterize European historic city centers (Figure 1) can be taken as an important reference in Europe
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