The Experts below are selected from a list of 13251 Experts worldwide ranked by ideXlab platform

Camille A Issa - One of the best experts on this subject based on the ideXlab platform.

  • preliminary study on interfacial bond strength due to successive Casting lifts of self consolidating concrete effect of thixotropy
    Construction and Building Materials, 2016
    Co-Authors: Joseph J Assaad, Camille A Issa
    Abstract:

    Abstract Vibration is prohibited during placement of freshly mixed self-consolidating concrete (SCC), making it particularly sensitive to delays or stoppages during multi-Layers Casting. This paper seeks to propose suitable testing methods that can be used to assess the effect of delays between successive lifts on interfacial bond strength of hardened material, including the proposal of time limits necessary to ensure proper mixing of Cast Layers. Two methods for testing bond by slant shear and pull-off are tested and compared. The SCC mixtures were proportioned to exhibit low to high thixotropic levels, while the relative delay between Cast Layers was set to 30, 60, and 120 min after initial mixing. Test results have shown that the lowest drop in interfacial bond strength occurred for moderately thixotropic mixtures, given the moderate bleeding rate that prevented dryness of the first Cast Layer while, at the same time, avoided excessive increase in water that reduces bond strength development along the interfaces.

Masoud Jabbari - One of the best experts on this subject based on the ideXlab platform.

  • Drying of a tape-Cast Layer : numerical modelling of the evaporation process in a graded/Layered material
    International Journal of Heat and Mass Transfer, 2016
    Co-Authors: Masoud Jabbari, V.a. Jambhekar, Jesper Henri Hattel, Rainer Helmig
    Abstract:

    Evaporation of water from a ceramic Layer is a key phenomenon in the drying process for the manufacturing of water-based tape Cast ceramics. In this paper we present a coupled free-flow-porous-media model on the Representative Elementary Volume (REV) scale for coupling non-isothermal multi-phase compositional porous-media flow — for the ceramic Layer — and single-phase compositional laminar free flow — for the air above it. The preliminary results show the typical expected evaporation behaviour from a porous medium initially saturated with water, and water–vapour transport to the free-flow region in accordance with the available results from the literature. We elaborate on and discuss the characteristic drying-rate curve for a single Layer ceramic, and compare it with that of a graded/Layered ceramic. We, moreover, show the influence of the mean diameter of particles of the porous medium (dp) — which directly affects the intrinsic permeability (K) based on the well-known Ergun’s equation — of each single ceramic Layer on the drying behaviour of a graded/Layered ceramic.

  • drying of a tape Cast Layer numerical modelling of the evaporation process in a graded Layered material
    International Journal of Heat and Mass Transfer, 2016
    Co-Authors: Masoud Jabbari, V.a. Jambhekar, Jesper Henri Hattel, Rainer Helmig
    Abstract:

    Evaporation of water from a ceramic Layer is a key phenomenon in the drying process for the manufacturing of water-based tape Cast ceramics. In this paper we present a coupled free-flow-porous-media model on the Representative Elementary Volume (REV) scale for coupling non-isothermal multi-phase compositional porous-media flow — for the ceramic Layer — and single-phase compositional laminar free flow — for the air above it. The preliminary results show the typical expected evaporation behaviour from a porous medium initially saturated with water, and water–vapour transport to the free-flow region in accordance with the available results from the literature. We elaborate on and discuss the characteristic drying-rate curve for a single Layer ceramic, and compare it with that of a graded/Layered ceramic. We, moreover, show the influence of the mean diameter of particles of the porous medium (dp) — which directly affects the intrinsic permeability (K) based on the well-known Ergun’s equation — of each single ceramic Layer on the drying behaviour of a graded/Layered ceramic.

Rainer Helmig - One of the best experts on this subject based on the ideXlab platform.

  • Drying of a tape-Cast Layer : numerical modelling of the evaporation process in a graded/Layered material
    International Journal of Heat and Mass Transfer, 2016
    Co-Authors: Masoud Jabbari, V.a. Jambhekar, Jesper Henri Hattel, Rainer Helmig
    Abstract:

    Evaporation of water from a ceramic Layer is a key phenomenon in the drying process for the manufacturing of water-based tape Cast ceramics. In this paper we present a coupled free-flow-porous-media model on the Representative Elementary Volume (REV) scale for coupling non-isothermal multi-phase compositional porous-media flow — for the ceramic Layer — and single-phase compositional laminar free flow — for the air above it. The preliminary results show the typical expected evaporation behaviour from a porous medium initially saturated with water, and water–vapour transport to the free-flow region in accordance with the available results from the literature. We elaborate on and discuss the characteristic drying-rate curve for a single Layer ceramic, and compare it with that of a graded/Layered ceramic. We, moreover, show the influence of the mean diameter of particles of the porous medium (dp) — which directly affects the intrinsic permeability (K) based on the well-known Ergun’s equation — of each single ceramic Layer on the drying behaviour of a graded/Layered ceramic.

  • drying of a tape Cast Layer numerical modelling of the evaporation process in a graded Layered material
    International Journal of Heat and Mass Transfer, 2016
    Co-Authors: Masoud Jabbari, V.a. Jambhekar, Jesper Henri Hattel, Rainer Helmig
    Abstract:

    Evaporation of water from a ceramic Layer is a key phenomenon in the drying process for the manufacturing of water-based tape Cast ceramics. In this paper we present a coupled free-flow-porous-media model on the Representative Elementary Volume (REV) scale for coupling non-isothermal multi-phase compositional porous-media flow — for the ceramic Layer — and single-phase compositional laminar free flow — for the air above it. The preliminary results show the typical expected evaporation behaviour from a porous medium initially saturated with water, and water–vapour transport to the free-flow region in accordance with the available results from the literature. We elaborate on and discuss the characteristic drying-rate curve for a single Layer ceramic, and compare it with that of a graded/Layered ceramic. We, moreover, show the influence of the mean diameter of particles of the porous medium (dp) — which directly affects the intrinsic permeability (K) based on the well-known Ergun’s equation — of each single ceramic Layer on the drying behaviour of a graded/Layered ceramic.

Joseph J Assaad - One of the best experts on this subject based on the ideXlab platform.

  • preliminary study on interfacial bond strength due to successive Casting lifts of self consolidating concrete effect of thixotropy
    Construction and Building Materials, 2016
    Co-Authors: Joseph J Assaad, Camille A Issa
    Abstract:

    Abstract Vibration is prohibited during placement of freshly mixed self-consolidating concrete (SCC), making it particularly sensitive to delays or stoppages during multi-Layers Casting. This paper seeks to propose suitable testing methods that can be used to assess the effect of delays between successive lifts on interfacial bond strength of hardened material, including the proposal of time limits necessary to ensure proper mixing of Cast Layers. Two methods for testing bond by slant shear and pull-off are tested and compared. The SCC mixtures were proportioned to exhibit low to high thixotropic levels, while the relative delay between Cast Layers was set to 30, 60, and 120 min after initial mixing. Test results have shown that the lowest drop in interfacial bond strength occurred for moderately thixotropic mixtures, given the moderate bleeding rate that prevented dryness of the first Cast Layer while, at the same time, avoided excessive increase in water that reduces bond strength development along the interfaces.

V.a. Jambhekar - One of the best experts on this subject based on the ideXlab platform.

  • Drying of a tape-Cast Layer : numerical modelling of the evaporation process in a graded/Layered material
    International Journal of Heat and Mass Transfer, 2016
    Co-Authors: Masoud Jabbari, V.a. Jambhekar, Jesper Henri Hattel, Rainer Helmig
    Abstract:

    Evaporation of water from a ceramic Layer is a key phenomenon in the drying process for the manufacturing of water-based tape Cast ceramics. In this paper we present a coupled free-flow-porous-media model on the Representative Elementary Volume (REV) scale for coupling non-isothermal multi-phase compositional porous-media flow — for the ceramic Layer — and single-phase compositional laminar free flow — for the air above it. The preliminary results show the typical expected evaporation behaviour from a porous medium initially saturated with water, and water–vapour transport to the free-flow region in accordance with the available results from the literature. We elaborate on and discuss the characteristic drying-rate curve for a single Layer ceramic, and compare it with that of a graded/Layered ceramic. We, moreover, show the influence of the mean diameter of particles of the porous medium (dp) — which directly affects the intrinsic permeability (K) based on the well-known Ergun’s equation — of each single ceramic Layer on the drying behaviour of a graded/Layered ceramic.

  • drying of a tape Cast Layer numerical modelling of the evaporation process in a graded Layered material
    International Journal of Heat and Mass Transfer, 2016
    Co-Authors: Masoud Jabbari, V.a. Jambhekar, Jesper Henri Hattel, Rainer Helmig
    Abstract:

    Evaporation of water from a ceramic Layer is a key phenomenon in the drying process for the manufacturing of water-based tape Cast ceramics. In this paper we present a coupled free-flow-porous-media model on the Representative Elementary Volume (REV) scale for coupling non-isothermal multi-phase compositional porous-media flow — for the ceramic Layer — and single-phase compositional laminar free flow — for the air above it. The preliminary results show the typical expected evaporation behaviour from a porous medium initially saturated with water, and water–vapour transport to the free-flow region in accordance with the available results from the literature. We elaborate on and discuss the characteristic drying-rate curve for a single Layer ceramic, and compare it with that of a graded/Layered ceramic. We, moreover, show the influence of the mean diameter of particles of the porous medium (dp) — which directly affects the intrinsic permeability (K) based on the well-known Ergun’s equation — of each single ceramic Layer on the drying behaviour of a graded/Layered ceramic.