Influence of particle size distribution and content of ceramic tile polishing residues on mechanical performance of cementitious matrices

ABSTRACT

This study aims to evaluate the influence of particle size distribution and the content of the replacement of cement by ceramic tile polishing residue on the mechanical strength of cementitious matrices. Eight types of mortars were produced in a ratio of 1:3 by weight (cement: sand) and water/fine (cement + residue) ratio of 0.48 with levels of replacement of 0; 10; 30 and 50% of ceramic tile polishing residue. It was adopted waste with two different particle size distributions: in natura and ground by 30 minutes in a ball mill. Residues were characterized by specific mass; laser diffraction analysis; X-ray diffraction and Chapelle modified method. In the fresh state, mortars were evaluated by tests of consistency, mass density and air content and in the hardened state by compression strength at 7, 28 and 150 days. The grinding of ceramic tile polishing residue was beneficial because it promoted the development of pozzolanic activity and an increase of the compression strength. The results showed that the replacement of 30% cement by ground residue resulted in compressive strength of 34 MPa at 28 days and it can reach 38MPa at 150 days. The replacement of cement by ceramic tile polishing residue with a controlled size particle distribution can be favorable to the industry because it possible reduce costs and environmental impact both by reuse of the residue or as a contribution to CO₂ mitigation.

Keywords
cement; polishing residue; fines; mortar