Optimization of the Concrete Mix Proportions Centered on Performance after Exposure to High Temperature

Chaboki-Khiabani, A.; Bastami, Morteza; Baghbadrani, M.; Kordi, M.

doi:10.4028/www.scientific.net/amr.268-270.372

Cited by 4 publications

(2 citation statements)

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“…33,34 The mechanical properties of NSC tested at elevated temperatures or after exposure to elevated temperatures has been investigated by numerous researchers. 27,31,[35][36][37][38][39][40][41] Exposure to temperatures between 121 C and 149 C are reported by some researchers to positively affect the mechanical properties of concrete. 42 However, all previous studies have demonstrated that exposing concrete to higher temperatures leads to a significant reduction in its residual post-fire compressive and tensile strengths as wells as its modulus of elasticity.…”

Section: Introductionmentioning

confidence: 99%

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Residual mechanical properties of concrete containing lightweight expanded clay aggregate (LECA) after exposure to elevated temperatures

Dabbaghi

Dehestani

Yousefpour

2021

Structural Concrete

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The mechanical properties of light-weight concrete (LWC) in fire are known to be better than those of normal-strength concrete (NSC), both at high temperature (hot properties) and after cooling (residual properties). The objective of this paper is to increase the knowledge of LWC's residual properties by testing a number of mixes containing expanded clay as light-weight coarse aggregate.An experimental program was carried out, in which one normal-weight concrete mix and two lightweight aggregate mixes containing different amounts of LECA were used to fabricate 72 concrete cylinders and 36 concrete prisms. All mixes contained silica fume as a supplementary cementitious material. The specimens were tested at the ambient temperature and after exposure to temperatures of 250, 500, and 750 C to obtain their compressive and tensile strength, modulus of elasticity, and stress-strain response. Results indicate that exposure to temperatures up to 250 C has no significant effect on the mechanical properties of concrete containing LECA just as in normal weight concrete.However, with increasing the temperature, increasing the lightweight aggregate content of the mix resulted in better strength retention after exposure to elevated temperatures. The experimental data are also used to develop equations to evaluate the residual mechanical properties of concrete.

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Section: Introductionmentioning

confidence: 99%

“…The mechanical properties of NSC tested at elevated temperatures or after exposure to elevated temperatures has been investigated by numerous researchers 27,31,35–41 . Exposure to temperatures between 121°C and 149°C are reported by some researchers to positively affect the mechanical properties of concrete 42 .…”

Section: Introductionmentioning

confidence: 99%