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Experimental study on thermal behaviors of two-layered functionally graded concrete slabs subjected to fire
Highlights Two-layered FGC slabs were designed to improve structural thermal performances. Fire tests were conducted to evaluate the fire resistance of FGC slabs under the standard fire. No explosive spalling occurred and structural layers kept in good bearing capacities. The interfaces were similar with the form of “multi-point attachment” under high temperature.
Abstract In order to improve structural thermal performances, this paper designed a two-layered functionally graded concrete (FGC) slab composed of an ultra-high performance concrete (UHPC) layer and a lightweight aggregate concrete (LWAC) layer. UHPC layers are used as structural layers to bear loads while LWAC layers are used for thermal insulation. Fire tests were conducted to investigate the fire resistance behaviors of the FGC slabs with different LWAC thicknesses under the ISO834 heating regime while homogeneous UHPC and normal concrete (NC) slabs were prepared as a contrast. The experimental results revealed that the LWAC could significantly reduce the temperature transferred to UHPC layers, where the interfacial temperatures of FGC slabs with 40 mm and 30 mm thick LWAC layers were 197 °C and 325 °C respectively. Meanwhile, the maximal mid-span deflections ranged from 26.1 mm to 31.5 mm respectively, approximately 55%-65% lower than those of homogeneous material specimens. Besides, FGC slabs presented good explosive spalling resistance, no delamination or debonding occurred at interfacial regions, and LWAC layers adhered to UHPC layers in the form of “multi-point attachment”. The studies provided a solution to the fire resistance design of reinforced concrete structures under high temperature based on the structural level, and the thickness of LWAC layers was optimized by finite element analyses.
Experimental study on thermal behaviors of two-layered functionally graded concrete slabs subjected to fire
Highlights Two-layered FGC slabs were designed to improve structural thermal performances. Fire tests were conducted to evaluate the fire resistance of FGC slabs under the standard fire. No explosive spalling occurred and structural layers kept in good bearing capacities. The interfaces were similar with the form of “multi-point attachment” under high temperature.
Abstract In order to improve structural thermal performances, this paper designed a two-layered functionally graded concrete (FGC) slab composed of an ultra-high performance concrete (UHPC) layer and a lightweight aggregate concrete (LWAC) layer. UHPC layers are used as structural layers to bear loads while LWAC layers are used for thermal insulation. Fire tests were conducted to investigate the fire resistance behaviors of the FGC slabs with different LWAC thicknesses under the ISO834 heating regime while homogeneous UHPC and normal concrete (NC) slabs were prepared as a contrast. The experimental results revealed that the LWAC could significantly reduce the temperature transferred to UHPC layers, where the interfacial temperatures of FGC slabs with 40 mm and 30 mm thick LWAC layers were 197 °C and 325 °C respectively. Meanwhile, the maximal mid-span deflections ranged from 26.1 mm to 31.5 mm respectively, approximately 55%-65% lower than those of homogeneous material specimens. Besides, FGC slabs presented good explosive spalling resistance, no delamination or debonding occurred at interfacial regions, and LWAC layers adhered to UHPC layers in the form of “multi-point attachment”. The studies provided a solution to the fire resistance design of reinforced concrete structures under high temperature based on the structural level, and the thickness of LWAC layers was optimized by finite element analyses.
Experimental study on thermal behaviors of two-layered functionally graded concrete slabs subjected to fire
Du, Linpu (author) / Ji, Xuping (author) / Wang, Yuxuan (author) / Han, Fangyu (author) / Lu, Kaiwei (author) / Wang, Jingquan (author)
Engineering Structures ; 297
2023-10-14
Article (Journal)
Electronic Resource
English
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