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Thermal Performance Assessment of Lightweight Aggregate Concrete by Different Test Methods

Author

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  • Maria da Glória Gomes

    (CERIS, Department of Civil Engineering, Architecture and Georesources (DECivil), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal)

  • José Alexandre Bogas

    (CERIS, Department of Civil Engineering, Architecture and Georesources (DECivil), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal)

  • Sofia Real

    (CERIS, Department of Civil Engineering, Architecture and Georesources (DECivil), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal)

  • António Moret Rodrigues

    (CERIS, Department of Civil Engineering, Architecture and Georesources (DECivil), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal)

  • Rita Machete

    (CERIS, Department of Civil Engineering, Architecture and Georesources (DECivil), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal)

Abstract

Structural lightweight aggregate concrete is currently an alternative to normal-weight concrete when thermal insulation properties are required to meet the objectives of energy efficiency and sustainability. The accurate evaluation of the thermal performance is thus essential for designing structural lightweight concrete elements. This paper aims to evaluate the thermal behavior of structural lightweight aggregate concrete, assessed through different tests methods. To this end, a vast experimental campaign was carried out involving specimens produced with several types of lightweight aggregate and different water/cement ratios. The thermal performance was established by thermal conductivity, which was determined according to a modified transient pulse method and a quasi-stationary method, and specific heat capacity, which was determined through a transient pulse method and a heat transfer method. Normal-weight concrete was also tested for comparison purposes. Experimental evidence showed that lightweight aggregate concretes with lower density are associated with up to about 50% lower thermal conductivity and higher specific heat capacity than normal-weight concrete. Moreover, the study demonstrated that the expeditious transient pulse method is suitable for assessing the thermal conductivity of this type of concrete, and that both the transient pulse method and the heat transfer method are adequate to determine the specific heat capacity.

Suggested Citation

  • Maria da Glória Gomes & José Alexandre Bogas & Sofia Real & António Moret Rodrigues & Rita Machete, 2023. "Thermal Performance Assessment of Lightweight Aggregate Concrete by Different Test Methods," Sustainability, MDPI, vol. 15(14), pages 1-18, July.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:14:p:11105-:d:1195491
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    References listed on IDEAS

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    1. Cheng, Rui & Pomianowski, Michal & Wang, Xin & Heiselberg, Per & Zhang, Yinping, 2013. "A new method to determine thermophysical properties of PCM-concrete brick," Applied Energy, Elsevier, vol. 112(C), pages 988-998.
    2. Ismael Vives & Francisco B. Varona & Antonio J. Tenza-Abril & Javier Pereiro-Barceló, 2021. "A Parametric Study to Assess Lightweight Aggregate Concrete for Future Sustainable Construction of Reinforced Concrete Beams," Sustainability, MDPI, vol. 13(24), pages 1-30, December.
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