The influence of fiber and mesh reinforcement on the mechanical and static properties of high-strength fiberglass concrete composites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26232511%3A_____%2F24%3AN0000082" target="_blank" >RIV/26232511:_____/24:N0000082 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The influence of fiber and mesh reinforcement on the mechanical and static properties of high-strength fiberglass concrete composites

Popis výsledku v původním jazyce

This contribution describes a selected stages of the development of high-strength fiberglass concrete composites, intended for the production of facade panels and other architectural elements with high useful properties in the form of high tensile strength after bending, low absorption and very good durability. The carried out research works were focused on the development of the production technology of pouring fresh fiberglass concrete mixtures into molds of the required size, but also on the development and optimization of the fiberglass concrete recipes, in which a combination of scattered fiber and mesh reinforcement in their composition was applied. The proposed fiberglass concrete mixtures were characterized by a specific composition, especially from the point of view of the reinforcement used. While common high strength concretes mainly use dispersed steel wire reinforcements in their composition, the developed concrete mixtures contain dispersed fiber reinforcements based on glass fibers of various lengths and glass mesh reinforcement. The aim of this step was to enable the production of future high-strength fiberglass concrete composites, not only with the help of the method of casting fresh mixture into prepared molds, but also with the help of the method for the production of sprayed fiberglass concrete composites, which is currently still a unique method, given the high strength requirement of the composites produced in this way. Prefabricated fiberglass concrete panels were evaluated especially from the point of view of compressive and tensile strength characteristics after 7 and 28 days, bulk density and absorbency. Testing was carried out according to the EN standards. The other significant stage of testing was the evaluation of durability tests and aesthetic parameters of fiberglass concrete composites. Special testing equipment of Research Institute for Building Materials was used, intended for testing the durability and resistance of building composites, especially against the effects of external climatic influences. The last stage of testing was focused on the static assessment of the developer composites in terms of pressure and wind suction on the tested composite facade panels. The result of the load tests of the concrete panels was knowledge about the mechanism of deformation and failure in the loading process even when the objective limit bearing capacity was reached. Also the static assessment was carried out for installation on the facades of buildings in the territory of the Czech Republic in wind zones IV and V, according to ČSN EN 1991-1-4. The static assessment proved the satisfactory load-bearing capacity and usability of these composites up to hight of 30 m in the mentioned wind zones. Using the chosen methods, it was possible to realize the production of composite thin-walled facade panels with a bending tensile strength exceeding 21 MPa and an absorbency of less than 5 % by weight. The very good resistance of the developed facade panels was confirmed by numerous tests in the form of long-term durability tests and static assessments. In ICCS27 27th International Conference on Composite, Structures, School of Engineering and Architecture, Ravenna Campus of University of Bologna, Italy, 3-6 September 2024

Název v anglickém jazyce

The influence of fiber and mesh reinforcement on the mechanical and static properties of high-strength fiberglass concrete composites

Popis výsledku anglicky

This contribution describes a selected stages of the development of high-strength fiberglass concrete composites, intended for the production of facade panels and other architectural elements with high useful properties in the form of high tensile strength after bending, low absorption and very good durability. The carried out research works were focused on the development of the production technology of pouring fresh fiberglass concrete mixtures into molds of the required size, but also on the development and optimization of the fiberglass concrete recipes, in which a combination of scattered fiber and mesh reinforcement in their composition was applied. The proposed fiberglass concrete mixtures were characterized by a specific composition, especially from the point of view of the reinforcement used. While common high strength concretes mainly use dispersed steel wire reinforcements in their composition, the developed concrete mixtures contain dispersed fiber reinforcements based on glass fibers of various lengths and glass mesh reinforcement. The aim of this step was to enable the production of future high-strength fiberglass concrete composites, not only with the help of the method of casting fresh mixture into prepared molds, but also with the help of the method for the production of sprayed fiberglass concrete composites, which is currently still a unique method, given the high strength requirement of the composites produced in this way. Prefabricated fiberglass concrete panels were evaluated especially from the point of view of compressive and tensile strength characteristics after 7 and 28 days, bulk density and absorbency. Testing was carried out according to the EN standards. The other significant stage of testing was the evaluation of durability tests and aesthetic parameters of fiberglass concrete composites. Special testing equipment of Research Institute for Building Materials was used, intended for testing the durability and resistance of building composites, especially against the effects of external climatic influences. The last stage of testing was focused on the static assessment of the developer composites in terms of pressure and wind suction on the tested composite facade panels. The result of the load tests of the concrete panels was knowledge about the mechanism of deformation and failure in the loading process even when the objective limit bearing capacity was reached. Also the static assessment was carried out for installation on the facades of buildings in the territory of the Czech Republic in wind zones IV and V, according to ČSN EN 1991-1-4. The static assessment proved the satisfactory load-bearing capacity and usability of these composites up to hight of 30 m in the mentioned wind zones. Using the chosen methods, it was possible to realize the production of composite thin-walled facade panels with a bending tensile strength exceeding 21 MPa and an absorbency of less than 5 % by weight. The very good resistance of the developed facade panels was confirmed by numerous tests in the form of long-term durability tests and static assessments. In ICCS27 27th International Conference on Composite, Structures, School of Engineering and Architecture, Ravenna Campus of University of Bologna, Italy, 3-6 September 2024

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20100 - Civil engineering

Projekt

<a href="/cs/project/FW01010031" target="_blank" >FW01010031: Ultravysokohodnotné vláknobetonové prvky pro architektonické účely</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů