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A platform for research: civil engineering, architecture and urbanism
Coating protection of loaded RC columns against elevated temperature
The objective of the present research work is to determine the effect of different coating types with different thicknesses on the residual load capacities of RC (reinforced concrete) loaded column models when subjected to symmetrical temperature rise up to 650 deg C for 30 minutes. Seventeen RC column specimens with concrete cover 1.0 cm and a specimen dimensions 10x15x70 cm were cast and reinforced with 4 (diameter) 6 mm longitudinal reinforcement and 7 (diameter) 3.5 mm stirrups equally distributed along the height. The concrete mix is designed to give characteristic strength, fcu, of 25 MPa. Siliceous gravel aggregate has been used in preparing the concrete mix. Among the seventeen column models, there are two uncoated specimens. One of them was tested directly in ambient temperature and the other was exposed to elevated temperature up to 650 deg C for 30 min. The remaining fifteen specimens are divided into five groups. Each group is used to investigate certain type of coating. Five different types of coating have been used in this study namely traditional cement plaster, perlite cement, vermiculite cement, LECA cement and perlite-gypsum. Three different thicknesses of each type of coating have been used in this study: 1.5 cm, 2.5 cm and 3.5 cm. Every column specimen was equipped with eight thermocouples to measure the temperature distributions inside the specimen at mid height. An electric furnace has been used in this work. Every specimen was exposed to the simultaneous effect of the axial service load and temperature of 650 deg C for 30 min period. The readings of applied loads and thermocouples were recorded at 5 min interval. Testing the columns after cooling to obtain their residual axial load capacity showed that Perlite proves to be the most effective plaster in increasing the loaded column's resistance to elevated temperature. Specimens coated with vermiculite cement came in the second place. Specimens coated with LECA cement came in the third place. Finally, specimens coated with traditional cement came in the last place.
Coating protection of loaded RC columns against elevated temperature
The objective of the present research work is to determine the effect of different coating types with different thicknesses on the residual load capacities of RC (reinforced concrete) loaded column models when subjected to symmetrical temperature rise up to 650 deg C for 30 minutes. Seventeen RC column specimens with concrete cover 1.0 cm and a specimen dimensions 10x15x70 cm were cast and reinforced with 4 (diameter) 6 mm longitudinal reinforcement and 7 (diameter) 3.5 mm stirrups equally distributed along the height. The concrete mix is designed to give characteristic strength, fcu, of 25 MPa. Siliceous gravel aggregate has been used in preparing the concrete mix. Among the seventeen column models, there are two uncoated specimens. One of them was tested directly in ambient temperature and the other was exposed to elevated temperature up to 650 deg C for 30 min. The remaining fifteen specimens are divided into five groups. Each group is used to investigate certain type of coating. Five different types of coating have been used in this study namely traditional cement plaster, perlite cement, vermiculite cement, LECA cement and perlite-gypsum. Three different thicknesses of each type of coating have been used in this study: 1.5 cm, 2.5 cm and 3.5 cm. Every column specimen was equipped with eight thermocouples to measure the temperature distributions inside the specimen at mid height. An electric furnace has been used in this work. Every specimen was exposed to the simultaneous effect of the axial service load and temperature of 650 deg C for 30 min period. The readings of applied loads and thermocouples were recorded at 5 min interval. Testing the columns after cooling to obtain their residual axial load capacity showed that Perlite proves to be the most effective plaster in increasing the loaded column's resistance to elevated temperature. Specimens coated with vermiculite cement came in the second place. Specimens coated with LECA cement came in the third place. Finally, specimens coated with traditional cement came in the last place.
Coating protection of loaded RC columns against elevated temperature
Schutzbeschichtung auf belasteten Stahlbetonsäulen gegen erhöhte Temperaturen
Hodhod, O.A. (author) / Rashad, A.M. (author) / Abdel-Razek, M.M. (author) / Ragab, A.M. (author)
Silicates Industriels ; 73 ; 139-146
2008
8 Seiten, 13 Bilder, 12 Quellen
Article (Journal)
English
Coating protection of loaded RC columns to resist elevated temperature
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