Investigating the potential of incorporating concrete floor polishing sludge waste in permeable concrete

Avaliação do potencial de incorporação de resíduos de lodo de polimento de piso de concreto no concreto permeável

Abstract

With the increase in floods in urban areas, the use of permeable pavement has become increasingly advantageous. In this context, the objective of this study was to evaluate the influence of the addition of concrete floor polishing waste (CFPW) on the physical, mechanical, and microstructural behavior of permeable concrete. Three different mixtures were evaluated: a reference sample determined based on the literature review and dosed with natural aggregates and two other samples with the addition of 2% CFPW and 4% CFPW, respectively, in relation to cement mass. When comparing the dosages of 2% CFPW and 4% CFPW to the reference sample, there was an increase in the average compressive strength of 57.45% and 33.78% for three days of curing, and 45.41% and 37.20% for seven days of curing. Furthermore, the flexural strength of 2% and 4% CFPW samples exhibited a superior performance of 55.70% and 58.75%, respectively, compared to the control after three days. At 28 days of age, the 4% CFPW composition showcased a 16.3% increase relative to the control and an 11% improvement compared to the 2% CFPW composition. For the permeability tests, no significant variations were observed. For the 2% CFPW and 4% CFPW samples, respectively, a reduction in the void ratio was observed to 25.08% and 12.44%. A good correlation between compressive and flexural strengths was determined.

Keywords:
mechanical performance; permeability; void index; sustainability; pervious concrete