Modeling of the thermal and mechanical properties of clay ceramics incorporating organic additives

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:708

Article

Nigay, P. M.^1,2  Sani, R.¹  Cutard, T.²  Nzihou, A.¹ 

[1] Ecole Mines Albi, Ctr RAPSODEE, Campus Jarlard,Route Teillet, F-81013 Albi 09, France

[2] Ecole Mines Albi, Inst Clement Ader, Campus Jarlard,Route Teillet, F-81013 Albi 09, France

关键词: Clay ceramic;    Clay bricks;    Organic additives;    Porosity;    Thermal conductivity;    Mechanical strength;   

DOI  :  10.1016/j.msea.2017.09.131

来源: Elsevier

【 摘 要 】

This paper presents the results of a combined experimental and theoretical study on a clay ceramic used for building applications. The thermal and mechanical properties of the clay ceramic were improved by addition of organic additives. The organic additives consisted of Olive Stone Flour (OSF), with round-shape particles of 55 gm, and Wheat Straw (WS), with 877 tun particles in the form of fibers. It was found that the combustion of OSF and WS resulted in a porosity formation during the firing process. The morphology of these pores corresponded to that of the organic additives. Therefore, the addition of small OSF particles decreased the median pore size of the clay ceramic. It improved the mechanical strength of the clay ceramic by 12% for an 8 wt% addition of OSF. On the other hand, the WS fibers increased the clay ceramic anisotropy. This resulted in a 41% improvement of the thermal conductivity using an 8 wt% addition of WS. Finally, a model was developed from these experimental results to predict the thermal conductivity and the mechanical strength of the clay ceramic with other organic additives. They were predicted from the parameters of the organic additives (i.e., true density, swelling degree, particle size distribution, particle shape factor). The predictions indicated that the thermal conductivity is improved by 50% with a 25% improvement of the mechanical strength using small organic fibers, which is a step forward in the development of fired clay bricks that can be used for both insulation and structure purposes in building applications.

【 授权许可】

Free