The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform

Nan Jiang - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Study of Gypsum-Concrete Dense-Column Composite Boards with External Thermal Insulation Systems
    Applied Sciences, 2020
    Co-Authors: Shaochun Ma, Nan Jiang
    Abstract:

    In this paper, a new kind of Gypsum-Concrete dense-column thermal insulation composite board was developed, with seismic tests conducted on three specimens under quasi-static loading conditions. The fracture feature, hysteresis behavior, material strain, load-bearing and deforming capacity, and energy-dissipating capacity of the composite board were analyzed. The results indicated that this composite board has a favorable energy-dissipating capacity, i.e., relatively high seismic performance. By comparing with the experimental results of composite boards without thermal insulation systems, the influence regularity of thermal insulation system on the deformation behavior of composite board was investigated. The comparison result indicated that with a thermal insulation system, the bearing capacity and ductility of composite board are obviously increased, implying that the thermal insulation system is beneficial for the seismic performance of composite boards.

  • Experimental investigation on the seismic behavior of a new-type composite interior wallboard
    Materials and Structures, 2016
    Co-Authors: Shaochun Ma, Nan Jiang
    Abstract:

    This study investigates the seismic performance of a new, environmentally friendly Gypsum-Concrete composite wallboard. The cavities are then filled with Concrete to produce a lattice structure with a dense column and girder structure. This promotes ease of positioning of the vertical and horizontal reinforcements and node treatment of the completed structure. The stress mechanism of the dense column composite wallboard filled with Concrete was modified to become a load-bearing component with strong transverse stiffness. The seismic performances of three specimens were experimentally evaluated including damage characteristics, load-carrying capacity, ductility, energy dissipation and stiffness degradation. Experimental results indicate that the Gypsum wallboard cracks appeared at alater stage than in conventional Concrete wallboard. Results were analyzed and compared to those of conventional steel reinforced Concrete wallboard. Findings demonstrate that the seismic behavior of the composite interior wallboard was outstanding, and that the ductility of the proposed green wallboard outperformed conventional steel reinforced Concrete wallboard.

Elzo F. Gernhart - One of the best experts on this subject based on the ideXlab platform.

  • Case study of modifications to a wood ``I'' beam framed floor-ceiling assembly which did not meet minimum International Building Code (IBC) impact insulation class (IIC) or sound transmission class (STC)
    Journal of the Acoustical Society of America, 2005
    Co-Authors: Elzo F. Gernhart
    Abstract:

    A direct comparison, using three identical floor‐ceiling assemblies, which did not meet minimum building codes standards for impact insulation class as built. Each floor‐ceiling assembly received different corrective measures in an effort to correct the deficiency. All corrective measures were limited to the bottom side of the assembly, since hardwood flooring was installed as the finished floor. All the floor‐ceiling assemblies consisted of light weight 16‐in. deep ‘‘I’’ beam structural framing members (joist) spaced at 24 in. center to center supporting 3/4 in.‐t & g plywood with 1‐1/2 in. light weight Gypsum Concrete covered with 1/2‐in. plywood and finished with hardwood flooring. Using tired old industry standard methods, products, and systems the best impact insulation class increase was twelve points which still did not meet minimum building code standards. By installing the state of the art products, using the proper methods available today under the floor‐ceiling assembly the field impact insulation class was increased 28 points to a field impact insulation class of 60 without acoustical mat on the top side of the assembly. By design the field sound transmission class was also improved (40 to 55 STC) due to product selection, installations procedures, and design.

Shaochun Ma - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Study of Gypsum-Concrete Dense-Column Composite Boards with External Thermal Insulation Systems
    Applied Sciences, 2020
    Co-Authors: Shaochun Ma, Nan Jiang
    Abstract:

    In this paper, a new kind of Gypsum-Concrete dense-column thermal insulation composite board was developed, with seismic tests conducted on three specimens under quasi-static loading conditions. The fracture feature, hysteresis behavior, material strain, load-bearing and deforming capacity, and energy-dissipating capacity of the composite board were analyzed. The results indicated that this composite board has a favorable energy-dissipating capacity, i.e., relatively high seismic performance. By comparing with the experimental results of composite boards without thermal insulation systems, the influence regularity of thermal insulation system on the deformation behavior of composite board was investigated. The comparison result indicated that with a thermal insulation system, the bearing capacity and ductility of composite board are obviously increased, implying that the thermal insulation system is beneficial for the seismic performance of composite boards.

  • Experimental investigation on the seismic behavior of a new-type composite interior wallboard
    Materials and Structures, 2016
    Co-Authors: Shaochun Ma, Nan Jiang
    Abstract:

    This study investigates the seismic performance of a new, environmentally friendly Gypsum-Concrete composite wallboard. The cavities are then filled with Concrete to produce a lattice structure with a dense column and girder structure. This promotes ease of positioning of the vertical and horizontal reinforcements and node treatment of the completed structure. The stress mechanism of the dense column composite wallboard filled with Concrete was modified to become a load-bearing component with strong transverse stiffness. The seismic performances of three specimens were experimentally evaluated including damage characteristics, load-carrying capacity, ductility, energy dissipation and stiffness degradation. Experimental results indicate that the Gypsum wallboard cracks appeared at alater stage than in conventional Concrete wallboard. Results were analyzed and compared to those of conventional steel reinforced Concrete wallboard. Findings demonstrate that the seismic behavior of the composite interior wallboard was outstanding, and that the ductility of the proposed green wallboard outperformed conventional steel reinforced Concrete wallboard.

Jamel Neji - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Phase Change Materials (PCMs) on the hydration reaction and kinetic of PCM-mortars
    2014
    Co-Authors: Sarra Drissi, Anissa Eddhahak-ouni, Sabine Caré, Jamel Neji
    Abstract:

    The Phase Change Materials (PCMs) are considered as an attractive way to reduce energy consumption thanks to their heat storage capacity. Their incorporation in the construction materials (Gypsum, Concrete) contribute to the reduction of the energy consumption of the building structures. Even though PCMs have shown their reliability from a thermal point of view, some drawbacks linked to their use were emphasized such as the loss of the compressive strength of the cementitious material with the addition of PCMs. This paper attempts to provide a possible explanation by the investigation of the hydration kinetic of PCM-mortars. The conventional semi-adiabatic Langavant test was adapted for this purpose. The results showed a lower heat released by the PCM-mortars compared to a control mortar as well as a delay in the hydration process with the addition of PCMs which may contribute to the loss of the compressive strength.

Wilson Byrick - One of the best experts on this subject based on the ideXlab platform.

  • Achieving minimum impact insulation class 50 rating using resilient clip technology in lightweight construction.
    Journal of the Acoustical Society of America, 2010
    Co-Authors: Wilson Byrick
    Abstract:

    Resilient clip technology is an alternative to resilient channel for supporting Gypsum wallboard in fire rated wall and floor‐ceiling assemblies. Lightweight wood frame construction presents challenges in meeting building code requirements for impact insulation class (IIC) and sound transmission class (STC) ratings in floor‐ceiling assemblies. Through laboratory testing we were able to compare different floor‐ceiling assemblies commonly used in multi‐family construction. Two different structures were tested, an 18 in. open web truss, 24 in. o.c., and a 12 in. engineered joist (TJI) 24 in. o.c. Various finish floor coverings were used including ceramic tile, vinyl, and engineered wood. Structures achieved minimum IIC and STC 50 with and without 3/4 in. Gypsum Concrete. Resilient rubber underlayment of varying thickness can further improve the IIC and STC ratings of the assembly as can adding a second layer of Gypsum wallboard.