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Rao A.,USG Corporation | Gooje V.,Thornton Tomasetti
2014 ASHRAE/IBPSA-USA Building Simulation Conference | Year: 2014

WUFI-ORNL/IBP is currently the most commonly used software tool in the industry to study transient hygrothermal behaviour of building envelopes. To analyze hygrothermal performance using WUFI, several criteria have to be simultaneously evaluated. This poses a challenge to understanding the dynamic interaction of various parameters at any point of time within the evaluation period. This paper describes a visualization tool created using Grasshopper, a graphical algorithm editor, that translates raw data from WUFI to a parsed-visual data. The visualization focuses on critical occurrences captured within the simulation output to understand performance in a quick but comprehensible manner. It also lays the foundation towards facilitating better integration of hygrothermal performance information into the whole building design process. © 2014 ASHRAE. Source


Stewart L.K.,Karagozian and Case, Inc. | Morrill K.B.,Karagozian and Case, Inc. | Natesaiyer K.,USG Corporation
Structures Congress 2012 - Proceedings of the 2012 Structures Congress | Year: 2012

There has been an increasing interest in the use of advanced materials in the design of curtain wall systems to resist blast loading. This paper summarizes a series of tests on high performance concrete (HPC) and ultra high performance (UHPC) panels to characterize the panel strength in flexure and shear for several panel types under dynamic loading conditions. The tests were performing using three types of FORTOCRETETM panels supplied by USG. One set of HPC panels was lightweight concrete fiber-reinforced FORTOCRETETM structural panels developed by USG. Another set of UHPC panels consisted of FORTOCRETETM Armor panels that use ultra high strength fiberreinforced concrete with and without E-glass face sheets. The testing was conducted at the University of California San Diego (UCSD) Blast Simulator Test Facility. A series of 20 panel tests were performed using the three panel types. Each panel was instrumented to provide experimental data to characterize the response of the panels that are suitable for developing and validating analytical models for the various configurations of FORTOCRETETM panels. The instrumentation consisted of three types of measurements: 1) load measurements of the dynamic panel reactions, 2) strain measurements of the dynamic flexural strains in the panels, 3) velocity measurements of the overall panel deflection histories, and 4) dynamic reactions. Each panel type was tested at different levels of blast loading to achieve a range of panel damage responses ranging from light to failure. The experimental data was used to develop material property data, validate analytical response models and to generalize the panel results into PI response diagrams. Based on these results, several blast curtain wall concepts were developed for GSA Level C blast loads and above and were validated in full-scale wall experiments with the UCSD Blast Simulator. © ASCE 2012. Source


Chen Z.,Northwestern University | Sucech S.,USG Corporation | Faber K.T.,Northwestern University
Journal of Materials Science | Year: 2010

The flexural strength of gypsum is reported for freestanding single crystals in three-point bending carried with a nanoindenter. The elastic modulus, splitting tensile strength, and fracture toughness of monolithic gypsum consisting of interlocking needle-like microcrystals are also reported as functions of porosity and accelerator addition. This study shows that geometric configurations, in addition to porosity, affect the mechanical properties of gypsum. The properties are improved by 50-100% when the crystal network changes from needle aggregates to one made up of homogeneous randomly oriented single crystals. An Ashby geometric model for open-cell foams is adopted to link the properties of the individual crystals and the bulk properties. The lower and upper bounds of the measured elastic modulus are in accordance with bending-dominated behavior and stretch-dominated behavior predicted by the model, respectively. However, the strength of gypsum is much lower than values predicted by the model, which is based failure on fracture of individual crystals, suggesting that the strength of monolithic gypsum may be instead controlled by the failure of weak intercrystalline contacts. © 2010 Springer Science+Business Media, LLC. Source


Rosenthal G.L.,USG Corporation
ASTM Special Technical Publication | Year: 2015

Reinforcement and aesthetic finishing of drywall joints and corners has seen steady evolution over the past century. Products on the market include numerous woven, nonwoven, and plastic tapes for joint reinforcement, and the patent literature outlines even more innovative, if not always practical, joint treatment strategies. The introduction of flexible plastic corner products has provided contractors with a variety of new options for robust and efficient finishing of off-angle corners and sweeping arches. The paper reviews the patent literature to highlight how new materials, new product designs, and new manufacturing technologies have addressed the challenges of finishing gypsum wallboard joints and corners and how various innovative solutions have increased efficiency and performance. Copyright © 2015 by ASTM International. Source


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USG Corporation | Date: 2011-10-25

Mixer attachment for power tools, namely electric drills.

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