Torque Penetrometric Test for the in-situ characterisation of historical mortars: fracture mechanics interpretation and experimental validation
| Autor: | Andrea Benedetti, Diego Marastoni, Giacomo Pignagnoli, Luca Pelà |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. ATEM - Anàlisi i Tecnologia d'Estructures i Materials, Marastoni, Diego, Benedetti, Andrea, Pelà, Luca, Pignagnoli, Giacomo |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Engineering
Fracture mechanic 0211 other engineering and technologies Torque wrench 020101 civil engineering Enginyeria civil::Materials i estructures [Àrees temàtiques de la UPC] Compressive strength 02 engineering and technology 0201 civil engineering Nondestructive testing Destructive testing Estructures de murs 021105 building & construction Fracture energy Fracture mechanics Historical construction General Materials Science Masonry Brickwork Civil and Structural Engineering Mortar joint business.industry Building and Construction Structural engineering Minor Destructive Testing (MDT) Penetrometric test Masonry--Testing Mortar Materials Science (all) business In-situ testing |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | The assessment of historical structures requires appropriate knowledge of the behaviour of the investigated materials. Concerning masonry, its mechanical characterisation is a challenging task, since its composite nature requires the careful evaluation of the behaviour of its material components. In particular, the experimental assessment of the strength of existing mortar in historical structures still encounters several difficulties. This study investigates a novel Minor Destructive Testing (MDT) technique virtually equivalent to the vane test used for soils. The instrumentation, called herein Torque Penetrometric Test (TPT), is composed of a steel nail with four protruding teeth and a torque wrench. The test consists in inserting the toothed nail into a mortar joint and then applying a torque by means of a dynamometric key, until reaching the failure of the material. This work presents a novel interpretation theory based on basic concepts of fracture mechanics and applied to the micro-mechanical analysis of the stress state induced by the instrument on the investigated mortar. The proposed interpretative theory is validated through the execution of experimental tests in the laboratory and in a historical masonry building. The test proves to be effective for a quick in-situ MDT evaluation of the strength of existing mortars. |
| Databáze: | OpenAIRE |
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