Belferrag, Allaoua ， Kriker, Abdelouahed ， Youcef, Fouzia ， Abboudi, Said ， Tie Bi, Salima
2022-09-01 INTERNATIONAL JOURNAL OF THERMOPHYSICS 2022 43(卷), 9(期), (null页)
In this paper, the effect of steel fibers recovered from pneumatic waste, dune sand (D), and its granulometric correction on the thermal conductivity of dune sand concrete was studied. Three types of steel fibers were used (f1, f2, and f3) having the lengths of 20 mm, 30 mm, and 40 mm, respectively, and diameters of 0.28 for f1 and f2 and 0.9 mm for f3, incorporated in the concrete with a volume fraction of 1 %. River sand (R) was used for the correction of dune sand granulometry. The proportions of 50 % D mixed with 50 % R and 40 % D mixed with 60 % R were adopted for the mixtures M-2 and M-3, respectively. The concretes made with only dune sand have a lower thermal conductivity, compared to the mixtures M-2 and M-3.The results obtained also showed that, when the concrete density decreases, the thermal conductivity decreases. The thermal conductivity of concretes without fibers is lower compared with fiber-reinforced concretes. Other parameters have an influence on this property, namely the diameter, the length, and the aspect ratio (l/d).