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Thermal diffusivity and residual strength of high-performance light-weight concrete exposed to high temperature
The extensive studies devoted so far to normal-strength light-weight aggregate concrete (LWAC or LWC) have exhaustively clarified its behavior. However, the introduction of high-strength light-weight aggregate concrete (HPLWAC or HPLWC), containing such hydraulically-active components as microsilica and fly ash, raises some concerns, for instance about the behavior at high temperature and after cooling. Whether HPLWC is more temperature-sensitive than LWC and ordinary normal- strength concrete (NSC) is still an open question. To investigate the temperature-induced mechanical damage in a mixed-aggregate, silica-fume HPLWC, a systematic research program is in progress at Milan University of Technology. Three concrete mixes (NSC, C30; LWC, LC 40; and HPLWC, LC 60), five temperature levels (20, 105, 250, 500 and 750 deg C), one thermal state (after cooling), three nominally-equal tests for each case (for repeatability) have been planned, bringing the total number of the specimens to 45. At the same time the thermal diffusivity of the materials has been evaluated up to 750 deg C. The first results show that HPLWC is somewhat more temperature-sensitive than LWC, but its reduced thennal diffusivity may be favorable to the integrity of fire-exposed R/C structures.
Thermal diffusivity and residual strength of high-performance light-weight concrete exposed to high temperature
The extensive studies devoted so far to normal-strength light-weight aggregate concrete (LWAC or LWC) have exhaustively clarified its behavior. However, the introduction of high-strength light-weight aggregate concrete (HPLWAC or HPLWC), containing such hydraulically-active components as microsilica and fly ash, raises some concerns, for instance about the behavior at high temperature and after cooling. Whether HPLWC is more temperature-sensitive than LWC and ordinary normal- strength concrete (NSC) is still an open question. To investigate the temperature-induced mechanical damage in a mixed-aggregate, silica-fume HPLWC, a systematic research program is in progress at Milan University of Technology. Three concrete mixes (NSC, C30; LWC, LC 40; and HPLWC, LC 60), five temperature levels (20, 105, 250, 500 and 750 deg C), one thermal state (after cooling), three nominally-equal tests for each case (for repeatability) have been planned, bringing the total number of the specimens to 45. At the same time the thermal diffusivity of the materials has been evaluated up to 750 deg C. The first results show that HPLWC is somewhat more temperature-sensitive than LWC, but its reduced thennal diffusivity may be favorable to the integrity of fire-exposed R/C structures.
Thermal diffusivity and residual strength of high-performance light-weight concrete exposed to high temperature
Thermodiffusion und Restfestigkeit von Hochleistungsleichtbeton nach Hochtemperatureinwirkung
Felicetti, R. (author) / Gambarova, P.G. (author) / Silva, M.F. (author) / Vimercati, M. (author)
2002
14 Seiten, 7 Bilder, 1 Tabelle, 17 Quellen
Conference paper
English
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