Lime-based mortar reinforced with randomly oriented polyvinyl-alcohol (PVA) fibers for strengthening historical masonry structures

Mercuri, Micaela; Vailati, Marco; Gregori, Amedeo

doi:10.1016/j.dibe.2023.100152

Cited by 18 publications

(8 citation statements)

References 80 publications

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“…Note that before the tests and application of the developed conductive mortar, workability was tested through flow tests. Similar measures are slump tests for concrete [35].…”

Section: Basic Property Tests Of Conductive Mortarmentioning

confidence: 82%

Development of Conductive Mortar for Efficient Sacrificial Anode Cathodic Protection of Reinforced Concrete Structures—Part 2: Four-Year Performance Evaluation in Bridges

Ha,

Jeong,

Jin

2024

Applied Sciences

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This study explores the efficacy of a sacrificial anode cathodic protection (SACP) system with an activated carbon-based conductive mortar in bridge structures. In the previous Part 1 study, various admixtures were compared to identify a conductive mortar for enhancing the performance of the SACP system, assessed through electrical conductivity, resistivity, cathodic protection (CP) potential and current, and 4 h depolarization potential. Part 2 extends the investigation by applying the developed conductive mortar containing activated carbon to an SACP system on an actual bridge structure in which corrosion has already been initiated. Before CP installation, the physical properties of the conductive mortar were evaluated to satisfy the standard requirements for concrete structure maintenance. Subsequently, zinc mesh and bulk anodes were installed on the bridge pier, followed by the application of a conductive mortar with an admixture ratio of 5%. Over a four-year period, performance was measured through regular 4 h depolarization potential checks and visual inspections. The SACP system with the conductive mortar demonstrated superior CP performance compared to the general mortar, confirming the effectiveness of the developed conductive mortar. Visual inspection after four years confirmed the workability of the SACP system with conductive mortar.

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“…Note that before the tests and application of the developed conductive mortar, workability was tested through flow tests. Similar measures are slump tests for concrete [35].…”

Section: Basic Property Tests Of Conductive Mortarmentioning

confidence: 82%

Development of Conductive Mortar for Efficient Sacrificial Anode Cathodic Protection of Reinforced Concrete Structures—Part 2: Four-Year Performance Evaluation in Bridges

Ha,

Jeong,

Jin

2024

Applied Sciences

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“…FRCM composites are also preferred to FRPs from a sustainability perspective, being obtained by embedding an open-grid fabric made of continuous fibers in different types of inorganic matrices (e.g., lime-based mortar, cement-based mortar, and geopolymers). In order to guarantee chemical compatibility with the historical substrate, new lime-based mortars, reinforced with randomly oriented polyvinyl alcohol (PVA) fibers, have lately been under investigation; the random orientation of the PVA fibers, indeed, is also a beneficial effect in seismic areas, since the stress state induced by an earthquake is directionally unknown [ 1 ].…”

Section: Introduction and Background Of This Studymentioning

confidence: 99%

“…Experimental datasets concerning G-FRCM-confined specimens (28 datasets, 59 specimens). ε mc /ε m < 1. a assumed value 1. the assumed values are in italics.…”

mentioning

confidence: 99%

FRCM Confinement of Masonry: Strain Model Assessment and New Proposals

Napoli,

Realfonzo

2024

Materials

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One of the main limitations to the use of fabric-reinforced cementitious matrix (FRCM) composites for the external confinement of masonry is the lack of accurate formulas for estimating the compressive strength and ultimate strain of confined members. With the aim of providing a contribution on the topic, the authors have been carrying out studies on the FRCM-confined masonry for some time and, in a recent study, they proposed some formulations for the prediction of compressive strength. In continuity to that work, an analytical study on the ultimate strain of FRCM-confined masonry is presented in this paper, and preliminary models were derived by considering a wide experimental database compiled from the technical literature. The accuracy of the found relationships was examined based on a comparison with the few formulas published in the literature or reported in international guidelines. To this purpose, it is worth highlighting that the current Italian Guidelines CNR-DT 215/2018 do not provide indications about the estimation of the ultimate strain of FRCM-confined masonry, and the study proposed here attempts to provide a contribution to the mentioned document.

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“…The same authors in another work [ 23 ] showed that a mix of natural hydraulic lime and air lime, with hydraulic content superior to 25%, can overcome certain drawbacks of aerial lime mortars, such as prolonged hardening times, making them more durable without making them excessively incompatible with historical materials. More recently, solutions of mixed hydraulic lime and cement mortars are being mechanically enhanced with short fiber additions [ 24 , 25 , 26 ] for existing masonry retrofitting operations with the objective of furnishing materials with more rapid applications compared to the most common fabric-reinforced cementitious matrices and textile-reinforced mortars (FRCM-TRM) [ 27 , 28 ]. However, the testing of the effectiveness of fiber-reinforced lime-based mortars in improving the in-plane masonry behavior at the macro-scale is still limited [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties of Two General-Purpose Cement–Lime Mortars Prepared Based on Air Lime

Zagaroli,

Kubica,

Galman

et al. 2024

Materials

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It is believed that the use of mortars based on air lime in the construction and renovation of brick buildings has a number of advantages, especially those closely related to the durability and strength of the structure. However, there is still a noticeable difference in the mechanical properties of these materials. This research investigated the mechanical characteristics of a mixed cement–lime mortar with the two most popular proportions of an air lime, cement, and sand mix: 1:1:6 and 1:2:9 (by volume). Mechanical tests were performed on standard and non-standard samples to assess compressive strength, tensile strength, flexural strength, and fracture energy. The obtained results indicate the possibility of using these mixtures in modern masonry construction, as well as in the aspect of sustainable development. Additionally, lime mortar with a higher lime content can be used in non-load-bearing walls and in renovation and repair works.

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Lime-based mortar reinforced with randomly oriented polyvinyl-alcohol (PVA) fibers for strengthening historical masonry structures

Cited by 18 publications

References 80 publications

Development of Conductive Mortar for Efficient Sacrificial Anode Cathodic Protection of Reinforced Concrete Structures—Part 2: Four-Year Performance Evaluation in Bridges

Development of Conductive Mortar for Efficient Sacrificial Anode Cathodic Protection of Reinforced Concrete Structures—Part 2: Four-Year Performance Evaluation in Bridges

FRCM Confinement of Masonry: Strain Model Assessment and New Proposals

Study on the Mechanical Properties of Two General-Purpose Cement–Lime Mortars Prepared Based on Air Lime

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