| Title | Valorization of phosphate mine waste rocks as aggregates for concrete |
|---|---|
| ID_Doc | 24356 |
| Authors | El Machi, A; Mabroum, S; Taha, Y; Tagnit-Hamou, A; Benzaazoua, M; Hakkou, R |
| Title | Valorization of phosphate mine waste rocks as aggregates for concrete |
| Year | 2021 |
| Published | |
| Abstract | The phosphate industry produces great amounts of waste-rocks during their mining activities in extraction and beneficiation steps. Waste-rocks are stored immediately on extraction sites or in the vicinity of treatment facilities. Different types of waste-rocks are generated, yet this paper discusses the use of stone-removal waste-rocks as aggregates for concrete. Starting from the chemical and mineralogical composition, those waste-rocks were characterized by different techniques. Common geotechnical tests were performed to assess the aggregates properties. Then, those aggregates were used in concrete formulation as a full replacement of natural aggregates in order to test their mechanical behavior in comparison to a reference concrete, using compressive, flexural and splitting tensile strengths as parameters to evaluate the concrete performance according to the required standards. Those aggregates indicated a 41% Los Angeles coefficient, 43% Micro Deval coefficient and 5.20% Water Absorption coefficient. The WRAM concrete has indicated an average of 12 MPa of compressive strength, 1.3 MPa of flexural strength and 2.65 MPa of splitting tensile strength at 28 days. (C) 2020 Elsevier Ltd. All rights reserved. |
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