Effect of Blaine fineness of recycling brick powder replacing cementitious materials in self compacting mortar

摘要

The present study aims to investigate the use of recycling brick powder (RBP) as a fractional replacement of cement in self compacting mortar. Cement was replaced by recycling brick powder in different proportions (0, 5, 10, 15 and 20%) by weight of cement. Three Blaine fineness (SSB) were used in this study (3900, 4300, and 5200 cm(2)/g). The experimental results showed that the substitution of cement by recycling brick powder with higher content (20%) decreases the workability of self compacting mortar (about 3%) and reduces its passing ability (about 30%). On the other hand, the increase of Blaine fineness of (RBP) led to improve the Fresh behaviour of mortars when the content of recycling brick powder kept constant. Mechanical performances of mortars in terms of compressive and tensile strength were improved by 13 and 105% respectively. Economically, the substitution of cement with 10% of brick powder gives a win of 10% of cement with an increase of 13% in compressive strength and 107% in tensile strength.