Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hybrid concretes: solutions for better bond and splitting tensile strength under elevated heat exposure
https://orcid.org/0000-0001-7114-1490
https://orcid.org/0000-0001-5220-1849
This paper presents the second part of the investigation on resistance to elevated temperatures of a proposed hybrid composite concrete (NCSF-Crete) mix. The composite including nano metakaolin (NC) and steel fibers (SF) in addition to regular concrete components has proven -in the first published part-earlier promoted fresh concrete behavior, and to have reduced loss in compressive strength after exposure to a wide range of elevated temperatures. This presented work evaluates another two critical mechanical characteristics for the proposed composite -namely- splitting and bond strengths.
A modified formula correlating splitting and compressive strength (28 days) based on experiments results for NCSF is proposed and compared to formulas derived for regular concrete in different design codes. Finally, both spitting and bond strengths are evaluated pre- and post-exposure to elevated temperatures reaching 600 °C for two hours.
The proposed NCSF-Crete shows remarkable fire endurance, especially in promoting bond strength as after 600 °C heat exposure tests, it maintained strength equivalent to 70% of a regular concrete control mix at room temperature. Improving residual splitting strength was very significant up to 450 °C exposure.
Obvious deterioration is monitored in splitting resistance for all concretes at 600 °C.
This proposed composite improved elevated heats resistance of the most significant concrete mechanical properties.
Using a more green and sustainable constituents in the composite.
The proposed composite gathers the merits of using NC and SF, each has been investigated separately as an addition to concrete mixes.
Hybrid concretes: solutions for better bond and splitting tensile strength under elevated heat exposure
https://orcid.org/0000-0001-7114-1490
https://orcid.org/0000-0001-5220-1849
This paper presents the second part of the investigation on resistance to elevated temperatures of a proposed hybrid composite concrete (NCSF-Crete) mix. The composite including nano metakaolin (NC) and steel fibers (SF) in addition to regular concrete components has proven -in the first published part-earlier promoted fresh concrete behavior, and to have reduced loss in compressive strength after exposure to a wide range of elevated temperatures. This presented work evaluates another two critical mechanical characteristics for the proposed composite -namely- splitting and bond strengths.
A modified formula correlating splitting and compressive strength (28 days) based on experiments results for NCSF is proposed and compared to formulas derived for regular concrete in different design codes. Finally, both spitting and bond strengths are evaluated pre- and post-exposure to elevated temperatures reaching 600 °C for two hours.
The proposed NCSF-Crete shows remarkable fire endurance, especially in promoting bond strength as after 600 °C heat exposure tests, it maintained strength equivalent to 70% of a regular concrete control mix at room temperature. Improving residual splitting strength was very significant up to 450 °C exposure.
Obvious deterioration is monitored in splitting resistance for all concretes at 600 °C.
This proposed composite improved elevated heats resistance of the most significant concrete mechanical properties.
Using a more green and sustainable constituents in the composite.
The proposed composite gathers the merits of using NC and SF, each has been investigated separately as an addition to concrete mixes.
Hybrid concretes: solutions for better bond and splitting tensile strength under elevated heat exposure
https://orcid.org/0000-0001-7114-1490
https://orcid.org/0000-0001-5220-1849
This paper presents the second part of the investigation on resistance to elevated temperatures of a proposed hybrid composite concrete (NCSF-Crete) mix. The composite including nano metakaolin (NC) and steel fibers (SF) in addition to regular concrete components has proven -in the first published part-earlier promoted fresh concrete behavior, and to have reduced loss in compressive strength after exposure to a wide range of elevated temperatures. This presented work evaluates another two critical mechanical characteristics for the proposed composite -namely- splitting and bond strengths.
A modified formula correlating splitting and compressive strength (28 days) based on experiments results for NCSF is proposed and compared to formulas derived for regular concrete in different design codes. Finally, both spitting and bond strengths are evaluated pre- and post-exposure to elevated temperatures reaching 600 °C for two hours.
The proposed NCSF-Crete shows remarkable fire endurance, especially in promoting bond strength as after 600 °C heat exposure tests, it maintained strength equivalent to 70% of a regular concrete control mix at room temperature. Improving residual splitting strength was very significant up to 450 °C exposure.
Obvious deterioration is monitored in splitting resistance for all concretes at 600 °C.
This proposed composite improved elevated heats resistance of the most significant concrete mechanical properties.
Using a more green and sustainable constituents in the composite.
The proposed composite gathers the merits of using NC and SF, each has been investigated separately as an addition to concrete mixes.
Hybrid concretes: solutions for better bond and splitting tensile strength under elevated heat exposure
Hybrid concretes
Elkady, Hala Mohamed (Autor:in) / Shalaby, Ola Bakr (Autor:in) / Kohail, Mohamed (Autor:in) / Nasr, Elsayed Abdel Raouf (Autor:in)
Journal of Structural Fire Engineering ; 13 ; 88-98
14.10.2021
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
SPLITTING TENSILE STRENGTH OF NEW-OLD CONCRETE BOND SUBJECTED TO ELEVATED TEMPERATURE
| British Library Conference Proceedings | 2008
Relative Compressive Strength of Concretes under Elevated Temperatures
| Online Contents | 2012
Relative Compressive Strength of Concretes under Elevated Temperatures
| British Library Online Contents | 2012