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Construction & building materials v.134, 2017년, pp.574 - 584   SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Porous inclusions as hosts for phase change materials in cementitious composites: Characterization, thermal performance, and analytical models

Aguayo, Matthew (School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, United States ); Das, Sumanta (Department of Civil and Environmental Engineering, University of Rhode Island, Kingston, RI 02881, United States ); Castro, Cesar (School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, United States ); Kabay, Nihat (Department of Civil Engineering, Yildiz Technical University, Istanbul, Turkey ); Sant, Gaurav (Department of Civil and Environmental Engineering, University of California Los Angeles, Los Angeles, CA, United States ); Neithalath, Narayanan (School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, United States );
  • 초록  

    Abstract This paper examines the influence of four different porous hosts (lightweight aggregates (LWA)) having different pore structure features, as hosts for phase change materials (PCM). The porosity and absorption capacity of the LWAs significantly influence the composite thermal conductivity. The incorporation of 5% of PCMs by total volume of the cementitious system reduces the composite thermal conductivity by ⩾10%. The fact that the inclusions (LWAs) in these composites are by themselves heterogeneous, and contain multiple components (solid phase, PCM, water, and air) necessitate careful application of predictive models. Multi-step Mori-Tanaka mean-field homogenization methods, either based on known microstructural arrangement in the composite, or property contrast between the constituents, are applied to predict the composite thermal conductivity. A microstructural contrast factor is used to account for both the thermal conductivities and the volume fractions of the phases with the highest property contrast. Smaller contrast factors result in improved agreement of the models with the experiments, thereby aiding in the selection of suitable predictive schemes for effective properties of such multi-phase composites. Highlights Characterization of porous hosts and quantification of their PCM-containing capacity. Consideration of host microstructure and phases in modeling thermal efficiency in cement based materials. Quantifies a microstructural contrast factor and its influence in prediction.


  • 주제어

    Phase change materials (PCM) .   Microstructure .   Lightweight aggregate .   Thermal conductivity .   Homogenization models.  

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