Experimental results and theoretical models are used to assess the effective thermal conductivity of porous inorganic polymer cements with porosity between 30 and 70 vol.%. It is shown that the bulk chemical composition affects the microstructure (grains size, pores size, spatial arrangement of pores, homogeneity, micro cracks, bleeding channels) with consequently the heat flow behaviour through the porous matrix. In particular, introduction of controlled fine pores in a homogeneous matrix of inorganic polymer cements results in an increase of pore volume and improvement of the thermal insulation. The variation of the effective thermal conductivity with the total porosity was found to be consistent with analytical models described by Maxwell–Eucken and Landauer.
E. Kamseu, B. Nait-Ali, M.C. Bignozzi, C. Leonelli, S. Rossignol, D.S. Smith (2012). Bulk Composition and Microstructure Dependence of Effective Thermal Conductivity of Porous Inorganic Polymer Cements. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 32, 1593-1603 [10.1016/j.jeurceramsoc.2011.12.030].
Bulk Composition and Microstructure Dependence of Effective Thermal Conductivity of Porous Inorganic Polymer Cements
BIGNOZZI, MARIA;
2012
Abstract
Experimental results and theoretical models are used to assess the effective thermal conductivity of porous inorganic polymer cements with porosity between 30 and 70 vol.%. It is shown that the bulk chemical composition affects the microstructure (grains size, pores size, spatial arrangement of pores, homogeneity, micro cracks, bleeding channels) with consequently the heat flow behaviour through the porous matrix. In particular, introduction of controlled fine pores in a homogeneous matrix of inorganic polymer cements results in an increase of pore volume and improvement of the thermal insulation. The variation of the effective thermal conductivity with the total porosity was found to be consistent with analytical models described by Maxwell–Eucken and Landauer.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
