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Jason Weiss - One of the best experts on this subject based on the ideXlab platform.

  • saturated lightweight aggregate for internal Curing in low w C mixtures monitoring water movement using x ray absorption
    Strain, 2011
    Co-Authors: Ryan Henkensiefken, Tommy Nantung, Jason Weiss
    Abstract:

    :  The susCeptibility for early-age shrinkage CraCking in low w/C ConCrete has led to the development of new teChnologies that Can reduCe the risk of CraCking. Internal Curing, one of these new teChnologies, uses saturated lightweight aggregate to supply ‘Curing water’ to low w/C pastes as they hydrate. While signifiCant researCh has been performed to determine the effeCts of internal Curing on shrinkage and stress development, relatively little detailed information exists on movement of water from the LWA to the paste. The details of when water moves and how far it travels has impliCations on the volume of aggregate and the aggregate gradation that should be used in mixture proportioning with internal Curing. This study examines the timing of the release of water from saturated lightweight aggregate (LWA) and the distanCe that water Can travel. X-ray absorption is used to determine the time at whiCh water is drawn out of the lightweight aggregate and the loss of water is traCed over time. Further, it examines the travel distanCe of the water into the paste. Experimental details assoCiated with the X-ray teChnique are provided to desCribe the importanCe of speCimen alignment. Further, in sealed speCimens, the results indiCate little water movement prior to set. After set however, the distanCe of water movement was as muCh as 2 mm. The importanCe of water movement is disCussed in terms of mixture proportioning and its influenCe on shrinkage and stress development.

  • water absorption in internally Cured mortar made with water filled lightweight aggregate
    Cement and Concrete Research, 2009
    Co-Authors: Ryan Henkensiefken, Javier Castro, Dale P Bentz, Tommy Nantung, Jason Weiss
    Abstract:

    The inCreased propensity for shrinkage CraCking in low water-to-Cement ratio (w/C) ConCrete has inspired the development of new teChnologies that Can reduCe the risk of early-age CraCking. One of these is internal Curing. Internal Curing uses saturated lightweight aggregate to supply 'Curing water' to low w/C paste as it hydrates. SignifiCant researCh has been performed to determine the effeCts of internal Curing on shrinkage and stress development; however, relatively little detailed information exists about the effeCts of internal Curing on fluid transport properties suCh as water absorption or diffusivity. This study examines the absorption of water into mortar speCimens made with saturated lightweight aggregates (SLWA). These results indiCate that the inClusion of SLWA Can reduCe the water absorption of mortar speCimens. This observation was reinforCed with eleCtriCal ConduCtivity measurements that exhibited similar reduCtions.

  • volume Change and CraCking in internally Cured mixtures made with saturated lightweight aggregate under sealed and unsealed Conditions
    Cement & Concrete Composites, 2009
    Co-Authors: Ryan Henkensiefken, Dale P Bentz, Tommy Nantung, Jason Weiss
    Abstract:

    Low water to Cement ratio (w/C) ConCrete exhibits inCreased oCCurrenCes of early-age shrinkage CraCking. These oCCurrenCes have spawned innovative developments in ConCrete mixture design that reduCe the risk of CraCking. One suCh development is internal Curing, whiCh utilizes the inClusion of saturated lightweight aggregate (SLWA). The SLWA supplies additional moisture to Cement paste as it hydrates thereby CounteraCting the effeCts of self-desiCCation. This paper presents results from a study that examined mortar systems with different volumes of SLWA under sealed and unsealed Conditions. SpeCifiCally, the results indiCate the influenCe of SLWA volume and type on the internal humidity, autogenous shrinkage, and restrained shrinkage CraCking behavior. The performanCe of eaCh system is shown to be related to the Cavitation of vapor-filled spaCe in the paste, the SLWA spaCing, and the pore struCture of the paste in relation to the LWA.

Ryan Henkensiefken - One of the best experts on this subject based on the ideXlab platform.

  • saturated lightweight aggregate for internal Curing in low w C mixtures monitoring water movement using x ray absorption
    Strain, 2011
    Co-Authors: Ryan Henkensiefken, Tommy Nantung, Jason Weiss
    Abstract:

    :  The susCeptibility for early-age shrinkage CraCking in low w/C ConCrete has led to the development of new teChnologies that Can reduCe the risk of CraCking. Internal Curing, one of these new teChnologies, uses saturated lightweight aggregate to supply ‘Curing water’ to low w/C pastes as they hydrate. While signifiCant researCh has been performed to determine the effeCts of internal Curing on shrinkage and stress development, relatively little detailed information exists on movement of water from the LWA to the paste. The details of when water moves and how far it travels has impliCations on the volume of aggregate and the aggregate gradation that should be used in mixture proportioning with internal Curing. This study examines the timing of the release of water from saturated lightweight aggregate (LWA) and the distanCe that water Can travel. X-ray absorption is used to determine the time at whiCh water is drawn out of the lightweight aggregate and the loss of water is traCed over time. Further, it examines the travel distanCe of the water into the paste. Experimental details assoCiated with the X-ray teChnique are provided to desCribe the importanCe of speCimen alignment. Further, in sealed speCimens, the results indiCate little water movement prior to set. After set however, the distanCe of water movement was as muCh as 2 mm. The importanCe of water movement is disCussed in terms of mixture proportioning and its influenCe on shrinkage and stress development.

  • water absorption in internally Cured mortar made with water filled lightweight aggregate
    Cement and Concrete Research, 2009
    Co-Authors: Ryan Henkensiefken, Javier Castro, Dale P Bentz, Tommy Nantung, Jason Weiss
    Abstract:

    The inCreased propensity for shrinkage CraCking in low water-to-Cement ratio (w/C) ConCrete has inspired the development of new teChnologies that Can reduCe the risk of early-age CraCking. One of these is internal Curing. Internal Curing uses saturated lightweight aggregate to supply 'Curing water' to low w/C paste as it hydrates. SignifiCant researCh has been performed to determine the effeCts of internal Curing on shrinkage and stress development; however, relatively little detailed information exists about the effeCts of internal Curing on fluid transport properties suCh as water absorption or diffusivity. This study examines the absorption of water into mortar speCimens made with saturated lightweight aggregates (SLWA). These results indiCate that the inClusion of SLWA Can reduCe the water absorption of mortar speCimens. This observation was reinforCed with eleCtriCal ConduCtivity measurements that exhibited similar reduCtions.

  • volume Change and CraCking in internally Cured mixtures made with saturated lightweight aggregate under sealed and unsealed Conditions
    Cement & Concrete Composites, 2009
    Co-Authors: Ryan Henkensiefken, Dale P Bentz, Tommy Nantung, Jason Weiss
    Abstract:

    Low water to Cement ratio (w/C) ConCrete exhibits inCreased oCCurrenCes of early-age shrinkage CraCking. These oCCurrenCes have spawned innovative developments in ConCrete mixture design that reduCe the risk of CraCking. One suCh development is internal Curing, whiCh utilizes the inClusion of saturated lightweight aggregate (SLWA). The SLWA supplies additional moisture to Cement paste as it hydrates thereby CounteraCting the effeCts of self-desiCCation. This paper presents results from a study that examined mortar systems with different volumes of SLWA under sealed and unsealed Conditions. SpeCifiCally, the results indiCate the influenCe of SLWA volume and type on the internal humidity, autogenous shrinkage, and restrained shrinkage CraCking behavior. The performanCe of eaCh system is shown to be related to the Cavitation of vapor-filled spaCe in the paste, the SLWA spaCing, and the pore struCture of the paste in relation to the LWA.

Tommy Nantung - One of the best experts on this subject based on the ideXlab platform.

  • saturated lightweight aggregate for internal Curing in low w C mixtures monitoring water movement using x ray absorption
    Strain, 2011
    Co-Authors: Ryan Henkensiefken, Tommy Nantung, Jason Weiss
    Abstract:

    :  The susCeptibility for early-age shrinkage CraCking in low w/C ConCrete has led to the development of new teChnologies that Can reduCe the risk of CraCking. Internal Curing, one of these new teChnologies, uses saturated lightweight aggregate to supply ‘Curing water’ to low w/C pastes as they hydrate. While signifiCant researCh has been performed to determine the effeCts of internal Curing on shrinkage and stress development, relatively little detailed information exists on movement of water from the LWA to the paste. The details of when water moves and how far it travels has impliCations on the volume of aggregate and the aggregate gradation that should be used in mixture proportioning with internal Curing. This study examines the timing of the release of water from saturated lightweight aggregate (LWA) and the distanCe that water Can travel. X-ray absorption is used to determine the time at whiCh water is drawn out of the lightweight aggregate and the loss of water is traCed over time. Further, it examines the travel distanCe of the water into the paste. Experimental details assoCiated with the X-ray teChnique are provided to desCribe the importanCe of speCimen alignment. Further, in sealed speCimens, the results indiCate little water movement prior to set. After set however, the distanCe of water movement was as muCh as 2 mm. The importanCe of water movement is disCussed in terms of mixture proportioning and its influenCe on shrinkage and stress development.

  • water absorption in internally Cured mortar made with water filled lightweight aggregate
    Cement and Concrete Research, 2009
    Co-Authors: Ryan Henkensiefken, Javier Castro, Dale P Bentz, Tommy Nantung, Jason Weiss
    Abstract:

    The inCreased propensity for shrinkage CraCking in low water-to-Cement ratio (w/C) ConCrete has inspired the development of new teChnologies that Can reduCe the risk of early-age CraCking. One of these is internal Curing. Internal Curing uses saturated lightweight aggregate to supply 'Curing water' to low w/C paste as it hydrates. SignifiCant researCh has been performed to determine the effeCts of internal Curing on shrinkage and stress development; however, relatively little detailed information exists about the effeCts of internal Curing on fluid transport properties suCh as water absorption or diffusivity. This study examines the absorption of water into mortar speCimens made with saturated lightweight aggregates (SLWA). These results indiCate that the inClusion of SLWA Can reduCe the water absorption of mortar speCimens. This observation was reinforCed with eleCtriCal ConduCtivity measurements that exhibited similar reduCtions.

  • volume Change and CraCking in internally Cured mixtures made with saturated lightweight aggregate under sealed and unsealed Conditions
    Cement & Concrete Composites, 2009
    Co-Authors: Ryan Henkensiefken, Dale P Bentz, Tommy Nantung, Jason Weiss
    Abstract:

    Low water to Cement ratio (w/C) ConCrete exhibits inCreased oCCurrenCes of early-age shrinkage CraCking. These oCCurrenCes have spawned innovative developments in ConCrete mixture design that reduCe the risk of CraCking. One suCh development is internal Curing, whiCh utilizes the inClusion of saturated lightweight aggregate (SLWA). The SLWA supplies additional moisture to Cement paste as it hydrates thereby CounteraCting the effeCts of self-desiCCation. This paper presents results from a study that examined mortar systems with different volumes of SLWA under sealed and unsealed Conditions. SpeCifiCally, the results indiCate the influenCe of SLWA volume and type on the internal humidity, autogenous shrinkage, and restrained shrinkage CraCking behavior. The performanCe of eaCh system is shown to be related to the Cavitation of vapor-filled spaCe in the paste, the SLWA spaCing, and the pore struCture of the paste in relation to the LWA.

Dale P Bentz - One of the best experts on this subject based on the ideXlab platform.

  • water absorption in internally Cured mortar made with water filled lightweight aggregate
    Cement and Concrete Research, 2009
    Co-Authors: Ryan Henkensiefken, Javier Castro, Dale P Bentz, Tommy Nantung, Jason Weiss
    Abstract:

    The inCreased propensity for shrinkage CraCking in low water-to-Cement ratio (w/C) ConCrete has inspired the development of new teChnologies that Can reduCe the risk of early-age CraCking. One of these is internal Curing. Internal Curing uses saturated lightweight aggregate to supply 'Curing water' to low w/C paste as it hydrates. SignifiCant researCh has been performed to determine the effeCts of internal Curing on shrinkage and stress development; however, relatively little detailed information exists about the effeCts of internal Curing on fluid transport properties suCh as water absorption or diffusivity. This study examines the absorption of water into mortar speCimens made with saturated lightweight aggregates (SLWA). These results indiCate that the inClusion of SLWA Can reduCe the water absorption of mortar speCimens. This observation was reinforCed with eleCtriCal ConduCtivity measurements that exhibited similar reduCtions.

  • volume Change and CraCking in internally Cured mixtures made with saturated lightweight aggregate under sealed and unsealed Conditions
    Cement & Concrete Composites, 2009
    Co-Authors: Ryan Henkensiefken, Dale P Bentz, Tommy Nantung, Jason Weiss
    Abstract:

    Low water to Cement ratio (w/C) ConCrete exhibits inCreased oCCurrenCes of early-age shrinkage CraCking. These oCCurrenCes have spawned innovative developments in ConCrete mixture design that reduCe the risk of CraCking. One suCh development is internal Curing, whiCh utilizes the inClusion of saturated lightweight aggregate (SLWA). The SLWA supplies additional moisture to Cement paste as it hydrates thereby CounteraCting the effeCts of self-desiCCation. This paper presents results from a study that examined mortar systems with different volumes of SLWA under sealed and unsealed Conditions. SpeCifiCally, the results indiCate the influenCe of SLWA volume and type on the internal humidity, autogenous shrinkage, and restrained shrinkage CraCking behavior. The performanCe of eaCh system is shown to be related to the Cavitation of vapor-filled spaCe in the paste, the SLWA spaCing, and the pore struCture of the paste in relation to the LWA.

Yan Yao - One of the best experts on this subject based on the ideXlab platform.

  • relative humidity and deterioration of ConCrete under freeze thaw load
    Construction and Building Materials, 2014
    Co-Authors: Zhendi Wang, Qiang Zeng, Ling Wang, Yan Yao
    Abstract:

    Evolution of internal relative humidity (RH) and deterioration of ConCrete under CyCliC freeze–thaw (F–T) load were studied. RH values of ConCrete speCimens were monitored upon freezing and thawing. Compressive strength, mass loss, visual ratings and porosimetry were used to evaluate Changes in ConCrete. DeCreasing water to Cement ratio (w/C) deCreased the steady-state internal RH. RH–temperature Curves showed that freezing temperature was independent of F–T CyCles, while thawing temperature varied with F–T CyCle and w/C. More severe deterioration, but less alteration of pore struCture, oCCurred in higher w/C ConCrete – inCreasing w/C inCreased iCe formation in pores, and thus effeCtive Crystallization pressure and liquid pressure.

  • Relative humidity and deterioration of ConCrete under freeze–thaw load
    Construction and Building Materials, 2014
    Co-Authors: Zhendi Wang, Qiang Zeng, Ling Wang, Yan Yao
    Abstract:

    Evolution of internal relative humidity (RH) and deterioration of ConCrete under CyCliC freeze–thaw (F–T) load were studied. RH values of ConCrete speCimens were monitored upon freezing and thawing. Compressive strength, mass loss, visual ratings and porosimetry were used to evaluate Changes in ConCrete. DeCreasing water to Cement ratio (w/C) deCreased the steady-state internal RH. RH–temperature Curves showed that freezing temperature was independent of F–T CyCles, while thawing temperature varied with F–T CyCle and w/C. More severe deterioration, but less alteration of pore struCture, oCCurred in higher w/C ConCrete – inCreasing w/C inCreased iCe formation in pores, and thus effeCtive Crystallization pressure and liquid pressure.