Name: OTAVIO GAIGHER SIMOES
Publication date: 23/02/2023
Examining board:
Name |
Role |
|---|---|
| JAMILLA EMI SUDO LUTIF TEIXEIRA | Examinador Interno |
| LIDIANE FERNANDA JOCHEM | Examinador Externo |
| RUDIELE APARECIDA SCHANKOSKI | Presidente |
Summary: Large amounts of ornamental stone waste (OSW) are generated annually in Brazil, a volume of 2.4 million tons is measured, most of which are destined for landfills, forming a worrying environmental liability. In order to contribute to solutions that minimize its disposal and also add technical value to this material, the use of these residues for the production of permeable pavements is proposed. For this purpose, draining concrete was produced, containing 0, 5, 10 and 15% of granite or marble contents replacing Portland cement. Porosity, permeability, compressive strength and abrasion resistance tests were conducted, based on current normative prescriptions. The compressive strength results of the parts incorporated with 5% and 10% of waste from granitic rock (OSW-G), obtained characteristic strength above the minimum required by the standard (20MPa), with 20.6 and 20.1 MPa respectively, while parts with 15% replacement did not obtain a satisfactory result (16.3 MPa). For pavers with marble waste (OSW-M), the pieces with 5% and 10% did not show the minimum resistance required by the current standard, with results of 15.0 and 16.6 MPa, while the paver with 15% was the most resistant of all the mixes (34.4 MPa). The porosity and permeability results for the parts with OSW-G were satisfactory, with results above 16.6% and 5,000 millimeters per hour, respectively, for all tested mixtures. For the pavers made with marble waste (OSW-M), the porosity and permeability results met the minimum normative conditions (15 to 30% and 3,600 mm/h), in mixtures with 5% and 10% residue contents, with values above 19% and 6,000 mm/h. On the other hand, the paver with 15% replacement of cement by residue did not show adequate porosity and permeability, making it ineffective in these aspects. For abrasion resistance, the pieces had more wear, due to the increase in porosity. The mixtures with 5, 10 and 15% of RBRO-G had wear of 0,794, 0,875 and 0,947 millimeters respectively, and the mixtures with 5 and 10% of RBRO-M had wear of 1,079 and 0,751 millimeters respectively, and the mixture with 15% of RBRO-M was excluded from the analyses. Both mixtures containing granite and marble had greater wear compared to the reference mixture.
Keywords: Permeable paver, permeable, ornamental stone wastes, granite, marble.
