Cleaner production of the lightweight insulating composites: Microstructure, pore network and thermal conductivity

被引:40
作者
Fongang, R. T. Tene [1 ,2 ]
Pemndje, J. [2 ]
Lemougna, P. N. [2 ]
Melo, U. Chinje [2 ]
Nanseu, C. P. [1 ]
Nait-Ali, B. [3 ]
Kamseu, E. [2 ,4 ]
Leonelli, C. [4 ]
机构
[1] Univ Yaounde I, Dept Inorgan Chem, Yaounde, Cameroon
[2] Local Mat Promot Author MIPROMALO, Yaounde, Cameroon
[3] Ctr Europeen Ceram, Grp Etud Mat Heterogenes, F-87068 Limoges, France
[4] Univ Modena & Reggio Emilia, Dept Engn Enzo Ferrari, I-41125 Modena, Italy
关键词
Clean insulating materials; Sustainable; Pore network; Density; Microstructure; Thermal conductivity; COMPRESSIVE STRENGTH; CONCRETE; DIFFUSIVITY; DISPERSION; BEHAVIOR; VOLUME; HEAT;
D O I
10.1016/j.enbuild.2015.08.009
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Inorganic polymer cement paste was used as cleaner binder for the design of lightweight matrices as insulating envelopes and panels in building and construction industries. Sponge-like structure with a homogeneously distributed pore network, low density and low thermal conductivity permitted to classify the geopolymer-wood fiber composites promising clean insulating materials. Matrices with the density similar to 0.79 g/cm(3),bi-axial four-point flexural strength of similar to 4 MPa presented thermal conductivity between 0.2 and 0.3 W/(mK). The possibility of substituting the sodium silicate with rice ash-NaOH system and the efficiency of the matrices to constitute an effective tortuous road for the thermal gradient improved the sustainability and quality of this new class of products. The pores network and the microstructure approximated by a spatial periodic geometry suggested a "macro transport" mechanism to explain the movement of heat across the matrix of light geopolymer composite. (C) 2015 Elsevier BM. All rights reserved.
引用
收藏
页码:113 / 122
页数:10
相关论文
共 34 条
[1]   Effect of the pore volume fraction on the thermal conductivity and mechanical properties of kaolin-based foams [J].
Bourret, J. ;
Tessier-Doyen, N. ;
Nait-Ali, B. ;
Pennec, F. ;
Alzina, A. ;
Peyratout, C. S. ;
Smith, D. S. .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2013, 33 (09) :1487-1495
[2]  
Brenner H., 1993, MACROTRANSPORT PROCE, DOI DOI 10.1126/science.1167334
[3]  
Davidovits J., 2011, Geopolymers: Chemistry and applications, V3rd
[4]   The effects of expanded perlite aggregate, silica fume and fly ash on the thermal conductivity of lightweight concrete [J].
Demirboga, R ;
Gül, R .
CEMENT AND CONCRETE RESEARCH, 2003, 33 (05) :723-727
[5]   Influence of mineral admixtures on thermal conductivity and compressive strength of mortar [J].
Demirboga, R .
ENERGY AND BUILDINGS, 2003, 35 (02) :189-192
[6]   Thermal conductivity and compressive strength of concrete incorporation with mineral admixtures [J].
Demirboga, Ramazan .
BUILDING AND ENVIRONMENT, 2007, 42 (07) :2467-2471
[7]   Cold-setting refractory composites from cordierite and mullite-cordierite design with geopolymer paste as binder: Thermal behavior and phase evolution [J].
Djangang, Chantale N. ;
Tealdi, Cristina ;
Cattaneo, Alice S. ;
Mustarelli, Piercarlo ;
Kamseu, Elie ;
Leonelli, Cristina .
MATERIALS CHEMISTRY AND PHYSICS, 2015, 154 :66-77
[8]  
Dul'nev G.N., 1991, Transport Processes in Non-uniform Media
[9]   CONVECTIVE DIFFUSIVE REACTIVE TAYLOR DISPERSION PROCESSES IN PARTICULATE MULTIPHASE SYSTEMS [J].
DUNGAN, SR ;
SHAPIRO, M ;
BRENNER, H .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1990, 429 (1877) :639-671
[10]  
EDWARDS DA, 1991, TRANSPORT POROUS MED, V6, P337, DOI 10.1007/BF00136346