Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A numerical study on the effect of restrained shrinkage on rapid hardening plain and recycled clean steel fibre concrete overlays
https://orcid.org/0000-0001-6672-7665
Highlights Restrained shrinkage of plain and fibre reinforced rapid hardening mortars is numerically investigated. Uniform shrinkage strain distribution underestimates the hygral tensile stresses of overlays. A modification to account for non-uniform shrinkage is proposed through shrinkage amplification factor. Fibre inclusion is shown to reduce risk of deterioration at the interface.
Abstract This article presents FE numerical studies on restrained shrinkage of plain and fibre reinforced rapid hardening mortars. Moisture diffusivity analysis is coupled with structural analysis to calculate the evolution of hygral stresses, strains and cracking over time. The numerical results are validated against results from analytical models and compared to measured experimental values. Parametric studies are carried out to examine the effect of the interface stiffness, moisture content of the substrate layer and overlay depth on restrained shrinkage strain and stresses of overlays. Fibre inclusion is shown to reduce the risk of deterioration by slowing down the evolution of local slippage and controlling crack widths. It is also found that the uniform shrinkage strain distribution that is assumed in analytical models underestimates the hygral tensile stresses of overlays compared to real non-linear strain distribution. A modification to account for this effect is proposed through shrinkage amplification factor. This approach is expected to provide a better estimation of the risk of cracking in overlays.
A numerical study on the effect of restrained shrinkage on rapid hardening plain and recycled clean steel fibre concrete overlays
https://orcid.org/0000-0001-6672-7665
Highlights Restrained shrinkage of plain and fibre reinforced rapid hardening mortars is numerically investigated. Uniform shrinkage strain distribution underestimates the hygral tensile stresses of overlays. A modification to account for non-uniform shrinkage is proposed through shrinkage amplification factor. Fibre inclusion is shown to reduce risk of deterioration at the interface.
Abstract This article presents FE numerical studies on restrained shrinkage of plain and fibre reinforced rapid hardening mortars. Moisture diffusivity analysis is coupled with structural analysis to calculate the evolution of hygral stresses, strains and cracking over time. The numerical results are validated against results from analytical models and compared to measured experimental values. Parametric studies are carried out to examine the effect of the interface stiffness, moisture content of the substrate layer and overlay depth on restrained shrinkage strain and stresses of overlays. Fibre inclusion is shown to reduce the risk of deterioration by slowing down the evolution of local slippage and controlling crack widths. It is also found that the uniform shrinkage strain distribution that is assumed in analytical models underestimates the hygral tensile stresses of overlays compared to real non-linear strain distribution. A modification to account for this effect is proposed through shrinkage amplification factor. This approach is expected to provide a better estimation of the risk of cracking in overlays.
A numerical study on the effect of restrained shrinkage on rapid hardening plain and recycled clean steel fibre concrete overlays
https://orcid.org/0000-0001-6672-7665
Highlights Restrained shrinkage of plain and fibre reinforced rapid hardening mortars is numerically investigated. Uniform shrinkage strain distribution underestimates the hygral tensile stresses of overlays. A modification to account for non-uniform shrinkage is proposed through shrinkage amplification factor. Fibre inclusion is shown to reduce risk of deterioration at the interface.
Abstract This article presents FE numerical studies on restrained shrinkage of plain and fibre reinforced rapid hardening mortars. Moisture diffusivity analysis is coupled with structural analysis to calculate the evolution of hygral stresses, strains and cracking over time. The numerical results are validated against results from analytical models and compared to measured experimental values. Parametric studies are carried out to examine the effect of the interface stiffness, moisture content of the substrate layer and overlay depth on restrained shrinkage strain and stresses of overlays. Fibre inclusion is shown to reduce the risk of deterioration by slowing down the evolution of local slippage and controlling crack widths. It is also found that the uniform shrinkage strain distribution that is assumed in analytical models underestimates the hygral tensile stresses of overlays compared to real non-linear strain distribution. A modification to account for this effect is proposed through shrinkage amplification factor. This approach is expected to provide a better estimation of the risk of cracking in overlays.
A numerical study on the effect of restrained shrinkage on rapid hardening plain and recycled clean steel fibre concrete overlays
Al-musawi, Hajir (Autor:in) / Huang, Haidong (Autor:in) / Guadagnini, Maurizio (Autor:in) / Pilakoutas, Kypros (Autor:in)
25.11.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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