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High Temperature and Cracking: Equations to Avoid High-Heat Concrete Mixtures in Massive Bridge Footings

Antunes, Rodrigo

This study aims to provide engineers with a set of equations to evaluate temperature models for massive footings to avoid the use of high-heat mixtures that can induce excessive expansion. The temperatures of a concrete block and 41 massive footings were measured in the laboratory and construction sites. The equations for the peak core temperature ( $T_{PC}$ ), peak differential temperature ( $T_{D}$ ), and form removal time ( $t_{FR}$ ) are proposed for the thermal resistance of $0.029 W / m \cdot K$ for 12.7-mm-thick expanded polystyrene (EPS) and extruded polystyrene (XPS) boards or equivalent. Semiadiabatic temperature rise ( $T_{R}$ ) curves from 1.1-m elements can be used to model footings up to 1.8 m thick. The gradient temperature increment ( $G$ ) of $0.1 ° C / cm$ is recommended for limestone concrete. The cooling rate ( $F_{CR}$ ) range of $2.2 ° C / day \leq F_{CR} \leq 5.6 ° C / day$ is suggested. $T_{R}$ , $G$ , and $F_{CR}$ used in the equations should be validated with local concrete mixtures.

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High Temperature and Cracking: Equations to Avoid High-Heat Concrete Mixtures in Massive Bridge Footings

Antunes, Rodrigo

This study aims to provide engineers with a set of equations to evaluate temperature models for massive footings to avoid the use of high-heat mixtures that can induce excessive expansion. The temperatures of a concrete block and 41 massive footings were measured in the laboratory and construction sites. The equations for the peak core temperature ( $T_{PC}$ ), peak differential temperature ( $T_{D}$ ), and form removal time ( $t_{FR}$ ) are proposed for the thermal resistance of $0.029 W / m \cdot K$ for 12.7-mm-thick expanded polystyrene (EPS) and extruded polystyrene (XPS) boards or equivalent. Semiadiabatic temperature rise ( $T_{R}$ ) curves from 1.1-m elements can be used to model footings up to 1.8 m thick. The gradient temperature increment ( $G$ ) of $0.1 ° C / cm$ is recommended for limestone concrete. The cooling rate ( $F_{CR}$ ) range of $2.2 ° C / day \leq F_{CR} \leq 5.6 ° C / day$ is suggested. $T_{R}$ , $G$ , and $F_{CR}$ used in the equations should be validated with local concrete mixtures.

High Temperature and Cracking: Equations to Avoid High-Heat Concrete Mixtures in Massive Bridge Footings

Antunes, Rodrigo

This study aims to provide engineers with a set of equations to evaluate temperature models for massive footings to avoid the use of high-heat mixtures that can induce excessive expansion. The temperatures of a concrete block and 41 massive footings were measured in the laboratory and construction sites. The equations for the peak core temperature ( $T_{PC}$ ), peak differential temperature ( $T_{D}$ ), and form removal time ( $t_{FR}$ ) are proposed for the thermal resistance of $0.029 W / m \cdot K$ for 12.7-mm-thick expanded polystyrene (EPS) and extruded polystyrene (XPS) boards or equivalent. Semiadiabatic temperature rise ( $T_{R}$ ) curves from 1.1-m elements can be used to model footings up to 1.8 m thick. The gradient temperature increment ( $G$ ) of $0.1 ° C / cm$ is recommended for limestone concrete. The cooling rate ( $F_{CR}$ ) range of $2.2 ° C / day \leq F_{CR} \leq 5.6 ° C / day$ is suggested. $T_{R}$ , $G$ , and $F_{CR}$ used in the equations should be validated with local concrete mixtures.

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Titel:

High Temperature and Cracking: Equations to Avoid High-Heat Concrete Mixtures in Massive Bridge Footings

Beteiligte:

Antunes, Rodrigo (Autor:in)

Erschienen in:

Journal of Materials in Civil Engineering ; 33

Erscheinungsdatum:

28.09.2021

ISSN:

0899-1561 , 1943-5533

DOI:

https://doi.org/10.1061/(ASCE)MT.1943-5533.0003979

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Unbekannt

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