دانلود رایگان مقاله خصوصیات حرارتی مکانیکی مواد و مصالح ساختمانی

Abstract

This paper is a contribution to the valorization of Typha Australis as building material. To do this, the crushed fibers of Typha have been agglomerated using clay as binder. The weight percentage of binder is found to be at least 75% to obtain stable materials. The influence of binder content on mechanical and thermal insulation properties was examined. The mechanical properties were evaluated by using a mechanical press. The measurements of thermal effusivity and thermal conductivity of samples have been performed using the transient hot-plate method. Compression and tensile strengths respectively varies from 0.279 to 0.796 MPa and from 0.340 to 0.969 MPa when the weight percentage of binder range from 77–85%. This values have a strong linear correlation with the weight percentage of binder. The thermal conductivity of dry materials varies from 0.117 to 0.153 W.m−1.K−1 while the thermal effusivity rises from 228.9 to 300.0 View the MathML source. The results show that the thermal conductivity and thermal effusivity increases with increasing moisture content of materials.

4. Conclusion

This experimental study was a mechanical and thermophysical characterization of materials based on Typha fibers with a perspective of use as building materials. The binder used in this study was clay. The main results are: – from a mechanical point of view, the compression resistances and tensile strengths of the achieved materials were low and indicates that these materials in their present form cannot be used as a loadbearing material; they can be used in combination with an loadbearing structure; – the low values of thermal conductivity showed high thermal insulation capacities of these materials. These materials, subject to the results of additional tests like aging and fire resistance, can be an interesting alternative for imported and expensive insulation materials.