Mechanical and Durability Testing and XCT Imaging of a Lime-Based Micro-Scale Modified Smart Intervention Mortar

IF 2.3 3区工程技术 0 ARCHITECTURE

International Journal of Architectural Heritage Pub Date : 2023-11-13 DOI:10.1080/15583058.2023.2278067

Anastasios Drougkas, Vasilis Sarhosis, Alice Macente, Muhammed Basheer, Antonella D’Alessandro, Filippo Ubertini

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引用次数: 0

Abstract

Intervention materials for historic structures need to be mechanically and physically compatible with the in-situ material for maintaining durability. For historic masonry structures, joint repointing is ideally executed using lime-based mortars, which are inherently low-strength and deterioration-prone. Mortar modification through micro-scale fillers, in addition to enhancing self-sensing, could enhance mechanical properties, thereby improved intervention agents. Therefore, micro-scale modification of mortars can lead to the creation of smart intervention materials, suitable for structural health monitoring. This paper presents the mechanical and physical testing conducted on a natural hydraulic lime-based mortar modified using carbon microfibres. The objective of the study was the evaluation of the mechanical advantages of a micro-scale modified material over its unmodified counterpart as a repointing mortar for masonry structures. The strength enhancement of paste and mortar was measured. Changes in workability, durability and porosity due to modification were investigated. The test results helped establish the superiority of the modified mortar as an intervention material compared to the unmodified lime mortar. The modified materials exhibited enhanced mechanical strength. The consistence of the modified mortar was not negatively impacted by the micro-scale fillers. The modified mortar had slightly lower salt intrusion durability, while the durability of the paste was improved.

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石灰基微尺度改性智能修井砂浆力学耐久性试验及XCT成像

历史建筑的干预材料需要在机械和物理上与原位材料兼容，以保持耐久性。对于历史悠久的砖石结构，接缝重新定位最理想的方法是使用石灰基砂浆，这种砂浆本身强度低，容易变质。通过微尺度填料对砂浆进行改性，除了增强自感知能力外，还可以提高砂浆的力学性能，从而改善干预剂的性能。因此，对砂浆进行微尺度改性可以创造出适合于结构健康监测的智能干预材料。本文介绍了用炭微纤维改性天然水工石灰基砂浆的力学性能和物理性能。该研究的目的是评估微尺度改性材料相对于未改性材料的机械优势，作为砖石结构的重定向砂浆。测定了膏体和砂浆的强度增强率。研究了改性后可加工性、耐久性和孔隙率的变化。试验结果表明，与未改性石灰砂浆相比，改性砂浆作为干预材料具有优越性。改性后的材料表现出增强的机械强度。微尺度填料对改性砂浆的稠度没有负面影响。改性砂浆的盐侵耐久性略低，但砂浆的耐久性有所提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Architectural Heritage 工程技术-工程：土木

CiteScore

7.20

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： International Journal of Architectural Heritage provides a multidisciplinary scientific overview of existing resources and modern technologies useful for the study and repair of historical buildings and other structures. The journal will include information on history, methodology, materials, survey, inspection, non-destructive testing, analysis, diagnosis, remedial measures, and strengthening techniques. Preservation of the architectural heritage is considered a fundamental issue in the life of modern societies. In addition to their historical interest, cultural heritage buildings are valuable because they contribute significantly to the economy by providing key attractions in a context where tourism and leisure are major industries in the 3rd millennium. The need of preserving historical constructions is thus not only a cultural requirement, but also an economical and developmental demand. The study of historical buildings and other structures must be undertaken from an approach based on the use of modern technologies and science. The final aim must be to select and adequately manage the possible technical means needed to attain the required understanding of the morphology and the structural behavior of the construction and to characterize its repair needs. Modern requirements for an intervention include reversibility, unobtrusiveness, minimum repair, and respect of the original construction, as well as the obvious functional and structural requirements. Restoration operations complying with these principles require a scientific, multidisciplinary approach that comprehends historical understanding, modern non-destructive inspection techniques, and advanced experimental and computer methods of analysis.