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A platform for research: civil engineering, architecture and urbanism
Experimental and numerical study of cementitious composites subjected to high strain rate tensile loadings
Over the last decades, many attacks involving explosive materials have taken part in sensitive building and structures in different parts of the world. These events have stimulated scientists to study and provide solutions for this problem from different standpoints. From the point of view of the structural engineers, the studies have focused on the behaviour of structural materials subjected to blast loading and on the development of new construction materials with enhanced mechanical properties when subjected to high strain rates. According to the experience gained from this kind of events, many victims of these attacks were not caused by the direct impact of the explosion but by the so called progressive collapse. Previous researches have shown that the use of ductile materials may improve the structural behaviour against such progressive collapse. In this sense, self-compacting concrete reinforced with different steel fiber shapes can be considered a good candidate to improve structural behaviour against collapse due to its enhanced ductility. For these reasons this thesis focus on self-compacting concrete reinforced with two types of fibers, to investigate its properties under a wide range of loading rates. Three different self-compacting fiber-reinforced concretes, named A, B, and C, having the same cementitious matrix but different quantity and types of fibers were produced. The types of fibers considered were straight and hooked-end types. 40 kg/m3 of straight fibers were used in the three mixes, while the amount of hooked-end fibers was 0, 20 and 60 kg/m3 for the concretes A, B, and C, respectively. These three concretes exhibited different mechanical behavior in all tests performed on them, even under quasi-static loading rates. For the three concretes, three-point bending tests were conducted on prismatic notched beams with two different instruments, a servo-hydraulic testing machine and a drop-weight impact machine. The recommendations of the RILEM TC 162- TDF committee and the standard of EN 14651 ...
Experimental and numerical study of cementitious composites subjected to high strain rate tensile loadings
Over the last decades, many attacks involving explosive materials have taken part in sensitive building and structures in different parts of the world. These events have stimulated scientists to study and provide solutions for this problem from different standpoints. From the point of view of the structural engineers, the studies have focused on the behaviour of structural materials subjected to blast loading and on the development of new construction materials with enhanced mechanical properties when subjected to high strain rates. According to the experience gained from this kind of events, many victims of these attacks were not caused by the direct impact of the explosion but by the so called progressive collapse. Previous researches have shown that the use of ductile materials may improve the structural behaviour against such progressive collapse. In this sense, self-compacting concrete reinforced with different steel fiber shapes can be considered a good candidate to improve structural behaviour against collapse due to its enhanced ductility. For these reasons this thesis focus on self-compacting concrete reinforced with two types of fibers, to investigate its properties under a wide range of loading rates. Three different self-compacting fiber-reinforced concretes, named A, B, and C, having the same cementitious matrix but different quantity and types of fibers were produced. The types of fibers considered were straight and hooked-end types. 40 kg/m3 of straight fibers were used in the three mixes, while the amount of hooked-end fibers was 0, 20 and 60 kg/m3 for the concretes A, B, and C, respectively. These three concretes exhibited different mechanical behavior in all tests performed on them, even under quasi-static loading rates. For the three concretes, three-point bending tests were conducted on prismatic notched beams with two different instruments, a servo-hydraulic testing machine and a drop-weight impact machine. The recommendations of the RILEM TC 162- TDF committee and the standard of EN 14651 ...
Experimental and numerical study of cementitious composites subjected to high strain rate tensile loadings
2017-01-01
Theses
Electronic Resource
English
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