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A platform for research: civil engineering, architecture and urbanism
Mechanical properties of gypsum board at elevated temperatures
Gypsum board is a common fire barrier used in house an general building construction. Recently, evaluation of the collapses of the World Trade Center Towers highlighted the potential role and failure of gypsum board in containing the fires and resisting damage. The use of gypsum board as primary fire protection of light-frame wood or steel construction is ubiquitous. Yet knowledge of the common engineering mechanical properties of this construction product is nearly nonexistent. Gypsum board is used in a presciptive manner with little or no rational design. Summarized here are the results of a study examining the mechanical properties of type x gypsum board at elevated temperatures. These properties are needed to contemplate the engineering design of gypsum board fire barries. Tests were undertaken with a small oven within a test machine measuring mass loss, shrinkage, bending strength and modulus of elasticity at elevated temperatures to 400 deg C. the research shows that shrinkage and calcination of the gypsum board appear complete between 20 to 30 minutes of exposure at a uniform 400 deg C. Only after complete calcination, where all moisture is driven off, does the bending strength approach 0. Strength appeared to decrease linearly with increasing temperature. Mass loss and modulus of elasticity exhibited similar trends with the greatest decreases occurring from 100 to 200 deg C followed by more gradual decrease to 400 deg C. The surface paper plays significant stiffening and strengthening roles up to 60 minutes at temperatures as high as 200 deg C. Between 200 to 300 deg C the paper chars away and the strengthening influence gradually disappears. It was not uncommon in the tests at lower temperatures for the gypsum core to drack but the paper to retain its integrity allowing the panel to sustain an increase in load.
Mechanical properties of gypsum board at elevated temperatures
Gypsum board is a common fire barrier used in house an general building construction. Recently, evaluation of the collapses of the World Trade Center Towers highlighted the potential role and failure of gypsum board in containing the fires and resisting damage. The use of gypsum board as primary fire protection of light-frame wood or steel construction is ubiquitous. Yet knowledge of the common engineering mechanical properties of this construction product is nearly nonexistent. Gypsum board is used in a presciptive manner with little or no rational design. Summarized here are the results of a study examining the mechanical properties of type x gypsum board at elevated temperatures. These properties are needed to contemplate the engineering design of gypsum board fire barries. Tests were undertaken with a small oven within a test machine measuring mass loss, shrinkage, bending strength and modulus of elasticity at elevated temperatures to 400 deg C. the research shows that shrinkage and calcination of the gypsum board appear complete between 20 to 30 minutes of exposure at a uniform 400 deg C. Only after complete calcination, where all moisture is driven off, does the bending strength approach 0. Strength appeared to decrease linearly with increasing temperature. Mass loss and modulus of elasticity exhibited similar trends with the greatest decreases occurring from 100 to 200 deg C followed by more gradual decrease to 400 deg C. The surface paper plays significant stiffening and strengthening roles up to 60 minutes at temperatures as high as 200 deg C. Between 200 to 300 deg C the paper chars away and the strengthening influence gradually disappears. It was not uncommon in the tests at lower temperatures for the gypsum core to drack but the paper to retain its integrity allowing the panel to sustain an increase in load.
Mechanical properties of gypsum board at elevated temperatures
Mechanische Eigenschaften von Gipsbrettern bei hohen Temperaturen
Cramer, S.M. (author) / Friday, O.M. (author) / White, R.H. (author) / Sriprukiat, G. (author)
2003
10 Seiten, 6 Bilder, 1 Tabelle, 9 Quellen
Conference paper
English
Bauweise , Beschichtung (Überzug) , Brandschutz , Brandverhalten , Festigkeit , Feuerfestigkeit , feuerhemmende Imprägnierung , Feuerschutz , Feuersicherheit , Gewichtsverlust , Gips , Hochtemperatur , Materialeigenschaft , Montagewand , Temperaturabhängigkeit , Versuch , Wassergehalt , Werkstoffgefüge
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