Retarding effect of grinding dust and its influence on the physical-mechanical and rheological properties of cementitious matrices

R D Mariano,M R Morelli,D V Ribeiro,J S Andrade Neto

doi:10.1590/s1983-41952019000300004

Abstract

Abstract The present study evaluated the feasibility of the use of grinding dust (GD), a waste generated in the clutch disc finishing process, as a retardant additive in cementitious matrices. For this, the waste was added in contents of 5%, 10% and 15%, relative to the cement weight, and the setting time was determined by the Vicat method. In addition, the influence of this material on rheology (flow table, squeeze-flow and rotational rheometry) and on the physical-mechanical properties of the hardened matrices was analyzed. The results indicated an increase in setting time and a reduction in the fluidity of the mortars as a function of the addition of GD and the best results for the hardened state properties were verified for the cementitious matrices containing a 5% addition. Therefore, it was observed that GD is effective in retarding the setting time, presenting great potential for use in civil construction, without impairing its properties.

Highlights

The use of industrial waste as additives to cement matrices or supplementary cementitious materials (SCM) has been thoroughly studied in the past years
The present study evaluated the feasibility of the use of grinding dust (GD), a waste generated in the clutch disc finishing process, as a retardant additive in cementitious matrices
The results indicated an increase in setting time and a reduction in the fluidity of the mortars as a function of the addition of GD and the best results for the hardened state properties were verified for the cementitious matrices containing a 5% addition

Summary

Introduction

The use of industrial waste as additives to cement matrices or supplementary cementitious materials (SCM) has been thoroughly studied in the past years. In several countries, such wastes are being viewed from a new perspective, as important inputs in production and with aggregate economic value, being considered byproducts [1]. Among the different wastes generated by the automotive industry is grinding dust (GD), a powdery material generated in the production of clutch discs, during the machining stage. Nowadays, grinding dust it is normally not re-used and/or recycled, being destined to incineration. RIBEIRO and MORELLI [4, 5] and RIBEIRO et al

Methods

Results

Conclusion