The Experts below are selected from a list of 35754 Experts worldwide ranked by ideXlab platform

Lucie Vandewalle - One of the best experts on this subject based on the ideXlab platform.

  • Improved model for plate-End Shear of CFRP strengthened RC beams
    Cement & Concrete Composites, 2001
    Co-Authors: Omar Ahmed, Dionys Gemert, Lucie Vandewalle
    Abstract:

    Abstract In case of RC members strengthened by means of externally bonded reinforcement, a premature failure can be detected in addition to the conventional modes of failure observed in RC unstrengthened beams. The premature failure occurs mainly due to both Shear and normal stresses induced in either the external reinforcement–concrete interface or at the level of steel reinforcement. This research is part of a complete programme aiming to set up design formulae to predict the strength of CFRP strengthened beams, particularly when premature failure through laminates-End Shear or concrete cover delamination occurs. Series of RC beams were strengthened with carbon-fiber-reinforced plastic (CFRP) laminates and tested to estimate the extent of the applicability of the formulae proposed by the authors, as well as to study the influence of the layout of the external reinforcement in terms of unsheeted length (the distance between CFRP laminates-End and the nearer support) and cross-sectional area, on the behaviour of strengthened beams. The predictions using the proposed formulae are compared with the obtained experimental results, as well as with the calculated design limit states. The interfacial Shear stress and the maximum deflection corresponding to the predicted values at maximum and service loads are also studied.

Manfred Wilhelm - One of the best experts on this subject based on the ideXlab platform.

  • low field rheo nmr a novel combination of nmr relaxometry with high End Shear rheology
    Journal of Rheology, 2017
    Co-Authors: Karlfriedrich Ratzsch, Christian Friedrich, Manfred Wilhelm
    Abstract:

    Time-domain NMR is a well known tool for assessing the molecular dynamics in soft matter by measuring the excitation and subsequent decay of 1H nuclear magnetization. It is widely used, e.g., to quantify the composition of heterogeneous soft matter systems like semicrystalline polymers or emulsions. Further applications, known from academic research and industrial application, include measuring the moisture content in solids, the residual magnetic dipolar coupling for quantifying molecular motion in crosslinked systems, or diffusometry. We report the integration of a permanent magnet based pulsed NMR spectrometer into a modern, commercially available high-End Shear rheometer. The setup allows for the first time to simultaneously conduct time-domain 1H NMR and steady Shear or dynamic rheological measurements on one sample and to directly correlate the results from both, without concerns about differences in the sample history or temperature calibration. Moreover, the new in-situ combination allows the full...

Omar Ahmed - One of the best experts on this subject based on the ideXlab platform.

  • Improved model for plate-End Shear of CFRP strengthened RC beams
    Cement & Concrete Composites, 2001
    Co-Authors: Omar Ahmed, Dionys Gemert, Lucie Vandewalle
    Abstract:

    Abstract In case of RC members strengthened by means of externally bonded reinforcement, a premature failure can be detected in addition to the conventional modes of failure observed in RC unstrengthened beams. The premature failure occurs mainly due to both Shear and normal stresses induced in either the external reinforcement–concrete interface or at the level of steel reinforcement. This research is part of a complete programme aiming to set up design formulae to predict the strength of CFRP strengthened beams, particularly when premature failure through laminates-End Shear or concrete cover delamination occurs. Series of RC beams were strengthened with carbon-fiber-reinforced plastic (CFRP) laminates and tested to estimate the extent of the applicability of the formulae proposed by the authors, as well as to study the influence of the layout of the external reinforcement in terms of unsheeted length (the distance between CFRP laminates-End and the nearer support) and cross-sectional area, on the behaviour of strengthened beams. The predictions using the proposed formulae are compared with the obtained experimental results, as well as with the calculated design limit states. The interfacial Shear stress and the maximum deflection corresponding to the predicted values at maximum and service loads are also studied.

Karlfriedrich Ratzsch - One of the best experts on this subject based on the ideXlab platform.

  • low field rheo nmr a novel combination of nmr relaxometry with high End Shear rheology
    Journal of Rheology, 2017
    Co-Authors: Karlfriedrich Ratzsch, Christian Friedrich, Manfred Wilhelm
    Abstract:

    Time-domain NMR is a well known tool for assessing the molecular dynamics in soft matter by measuring the excitation and subsequent decay of 1H nuclear magnetization. It is widely used, e.g., to quantify the composition of heterogeneous soft matter systems like semicrystalline polymers or emulsions. Further applications, known from academic research and industrial application, include measuring the moisture content in solids, the residual magnetic dipolar coupling for quantifying molecular motion in crosslinked systems, or diffusometry. We report the integration of a permanent magnet based pulsed NMR spectrometer into a modern, commercially available high-End Shear rheometer. The setup allows for the first time to simultaneously conduct time-domain 1H NMR and steady Shear or dynamic rheological measurements on one sample and to directly correlate the results from both, without concerns about differences in the sample history or temperature calibration. Moreover, the new in-situ combination allows the full...

Dionys Gemert - One of the best experts on this subject based on the ideXlab platform.

  • Improved model for plate-End Shear of CFRP strengthened RC beams
    Cement & Concrete Composites, 2001
    Co-Authors: Omar Ahmed, Dionys Gemert, Lucie Vandewalle
    Abstract:

    Abstract In case of RC members strengthened by means of externally bonded reinforcement, a premature failure can be detected in addition to the conventional modes of failure observed in RC unstrengthened beams. The premature failure occurs mainly due to both Shear and normal stresses induced in either the external reinforcement–concrete interface or at the level of steel reinforcement. This research is part of a complete programme aiming to set up design formulae to predict the strength of CFRP strengthened beams, particularly when premature failure through laminates-End Shear or concrete cover delamination occurs. Series of RC beams were strengthened with carbon-fiber-reinforced plastic (CFRP) laminates and tested to estimate the extent of the applicability of the formulae proposed by the authors, as well as to study the influence of the layout of the external reinforcement in terms of unsheeted length (the distance between CFRP laminates-End and the nearer support) and cross-sectional area, on the behaviour of strengthened beams. The predictions using the proposed formulae are compared with the obtained experimental results, as well as with the calculated design limit states. The interfacial Shear stress and the maximum deflection corresponding to the predicted values at maximum and service loads are also studied.