Journal of Thermal Analysis and Calorimetry

, Volume 137, Issue 6, pp 1867–1875 | Cite as

Numerical and experimental investigation of the effect of foam concrete as filler on design thermal conductivity of lightweight masonry block

  • M. Davraz
  • M. KoruEmail author
  • A. E. Akdağ


The thermal conductivities of many building materials are defined in the TS 825 standard. In this standard, the thermal conductivity of wall units such as brick and lightweight block was determined depending on the mass per unit volume and their configurations. Additionally, these values are used in the heat loss calculations of the buildings. The thermal conductivities of walls built with lightweight masonry block at 450–700 kg m−3 are given between 0.28 and 0.36 W m−1 K−1 in TS 825 standard. The insulation thicknesses of building’s external wall are directly affected by these values in different climatic regions of Turkey. In this study, the effect of foam concrete as filling material on thermal conductivity of lightweight masonry block was investigated. For this purpose, thermal conductivities of non-filling block and foam concrete-filled block were determined. The thermal conductivities of the block matrix and foam concrete were measured with HFM device. Then, thermal resistance and thermal conductivity values of blocks were analyzed by using computer program. Finally, the design thermal conductivities of external walls were calculated. When the analysis results were interpreted, it was found that the thermal conductivities of foam concrete-filled blocks are 4 times lower than the non-filling blocks. As a result, it was found that the use of foamed concrete at a density of 300 kg m−3 in order to improve the thermal insulation performance of hollow blocks was found to be extremely effective.


Lightweight masonry block Foam concrete Filling material Thermal insulation 



  1. 1.
    İzoder. Heat insulation in buildings and installations. Turkey: İzoder; 2013.Google Scholar
  2. 2.
    Energy Efficiency in the World and Turkey, Chamber Report, TMMOB Mechanical Eng. Chamber, Pub. Number: MMO/589; April 2012.Google Scholar
  3. 3.
    TS 825. Thermal insulation requirements for buildings. Ankara: Turkish Standards Institution; 2008.Google Scholar
  4. 4.
    TS EN ISO 6946. Building components and building elements—thermal resistance and thermal transmittance—calculation method. Ankara: Turkish Standards Institution; 2012.Google Scholar
  5. 5.
    TS EN 1745. Masonry and masonry products—methods for determining design thermal values. Ankara: Turkish Standards Institution; 2004.Google Scholar
  6. 6.
    TS EN ISO 8990. Thermal insulation—determination of steady-state thermal transmission properties—calibrated and guarded hot box. Ankara: Turkish Standards Institution; 2002.Google Scholar
  7. 7.
    Zukowski M, Haese G. Experimental and numerical investigation of a hollow brick filled with perlite insulation. Energy Build. 2010;42:1402–8. Scholar
  8. 8.
    Del Coz Diaz JJ, Garci Nieto PJ, Betegon Biempica C, Prendes Gero MB. Analysis and optimization of the heat-insulating light concrete hollow brick walls design by the finite element method. Appl Therm Eng. 2007;2007(27):1445–56. Scholar
  9. 9.
    Al-Hadhrami LM, Ahmad A. Assessment of thermal performance of different types of masonry bricks used in Saudi Arabia. Appl Therm Eng. 2009;29:1445–56. Scholar
  10. 10.
    Svoboda Z, Kubr M. Numerical simulation of heat transfer through hollow bricks in the vertical direction. J Build Phys. 2010;34(4):325–50. Scholar
  11. 11.
    Li LP, Wu ZG, Li ZY, He YL, Tao WQ. Numerical thermal optimization of the configuration of multi-holed clay bricks used for constructing building walls by the finite volume method. Int J Heat Mass Transf. 2008;51:3669–82. Scholar
  12. 12.
    Bouchair A. Steady state theoretical model of fired clay hollow bricks for enhanced external wall thermal insulation. Build Environ. 2008;43:1603–18. Scholar
  13. 13.
    Lakatos Á. Thermal conductivity of insulations approached from a new aspect. J Therm Anal Calorim. 2018;133:329. Scholar
  14. 14.
    Lakatos Á, Csáky I, Kalmár F. Thermal conductivity measurements with different methods: a procedure for the estimation of the retardation time. Mater Struct. 2015;48:1343. Scholar
  15. 15.
    Lakatos Á. Effect of the placement of aerogel insulation in the heat transfer properties. J Therm Anal Calorim. 2018;133:321. Scholar
  16. 16.
    Davraz M, Kılınçarslan Ş, Koru M. Strength and thermal conductivity properties of different density foam concretes. In: 9th International concrete conference 2015;93–102, Antalya.Google Scholar
  17. 17.
    Ramamurthy K, Kunhanandan Nambiar EK, Ranjani GIS. A classification of studies on properties of foam concrete. Cem Concr Compos. 2009;31:388–96. Scholar
  18. 18.
    Jones MR, McCarthy A. Preliminary views on the potential of foamed concrete as a structural material. Mag Concr Res. 2005;57(1):21–31.CrossRefGoogle Scholar
  19. 19.
    Kearsley EP, Wainwright PJ. The effect of porosity on the strength of foamed concrete. Cem Concr Res. 2002;32:233–9. Scholar
  20. 20.
    Nambiar EKK, Ramamurthy K. Sorption characteristics of foam concrete. Cem Concr Res. 2007;37:1341–7. Scholar
  21. 21.
    Just A, Middendorf B. Microstructure of high-strength foam concrete. Mater Charact. 2009;60:741–8. Scholar
  22. 22.
    Jing Liu MY, Alengaram UJ, Jumaat MZ, Mo KH. Evaluation of thermal conductivity, mechanical and transport properties of lightweight aggregate foamed geopolymer concrete. Energy Build. 2014;72:238–45. Scholar
  23. 23.
    Chen B, Liu N. A novel lightweight concrete-fabrication and its thermal and mechanical properties. Constr Build Mater. 2013;44:691–8. Scholar
  24. 24.
    Sayadi AA, Tapia JV, Neitzert TR, Clifton CG. Effect of expanded polystyrene (EPS) particles on fire resistance, thermal conductivity and compressive strength of foamed concrete. Constr Build Mater. 2016;112:716–24. Scholar
  25. 25.
    Pavlík Z, Jerman M, Trník A, Kočí V, Černý R. Effective thermal conductivity of hollow bricks with cavities filled by air and expanded polystyrene. J Build Phys. 2014;37(4):436–48. Scholar
  26. 26.
    TS EN 12664. Thermal performance of building materials and products—determination of thermal resistance by means of guarded hot plate and heat flow meter methods—dry and moist products of medium and low thermal resistance. Ankara: Turkish Standards Institution; 2009.Google Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Natural and Industrial Research and Application CenterS. Demirel UniversityIspartaTurkey
  2. 2.Energy Systems Engineering, Technology FacultyS. Demirel UniversityIspartaTurkey
  3. 3.Department of Medical Services and Technology, Vocational School of Technical ScienceS. Demirel UniversityIspartaTurkey

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