Influence of Water To Binder Ratio on Mechanical Properties of Blended Cements with Brick Powder Waste

摘要

Currently, the construction and demolition wastes are recovered and recycled in a reduced proportion. An efficient and easy approach to recover this waste is to embed it in inorganics binders. Considering that bricks represent porous ceramic bodies, the incorporation of the powders resulted from brick milling into cements could influence the water / binder ratio, which ensures the hardening process of binders. Therefore, the influence of the water / binder (w/b) ratio on mechanical strengths of the ordinary Portland cement with an addition of 20% brick powder waste was studied up to 360 days. The investigations showed that a w/b ratio of 0.45 determines compression strengths values which could be compared with those of references samples. After one year of hardening the mortar specimens were subjected to freeze-thaw cycles in order to determine their durability. The mortars specimens with w/b ratio of 0.45 recorded the best mechanical strengths values after 40 freeze-thaw cycles.