{"title":"Recycling of graphite tailings: Effect of graphite tailings on property asphalt mortar and environmental impact evaluation","authors":"","doi":"10.1016/j.conbuildmat.2024.138859","DOIUrl":null,"url":null,"abstract":"<div><div>The accumulation of graphite tailings (GT) in the tailings dam has caused severe damage to the ecological environment. This study investigates the feasibility of using GT as an alternative aggregate to fine aggregates (FA) in asphalt mortar. Various analytical tools, including a laser particle size analyzer, scanning electron microscope, X-ray diffractometer, and X-ray fluorescence, were utilized to characterize the properties of GT and FA. Asphalt mortar was prepared with four aggregate/asphalt weight ratios (0.3, 0.6, 0.9, 1.2). Scanning electron microscopy and FTIR spectroscopy were used to analyze the asphalt mortar's surface morphology and blending mechanism. The rheological properties of the asphalt mortar were evaluated using rotational viscosity test, dynamic shear rheological test, and bending beam rheological test. The environmental and economic aspects of GT were assessed through leaching toxicity and cost-benefit analysis. The results showed that GT has larger particle size and rougher surface, promoting better bonding with asphalt. With increasing GT content, the viscosity, complex modulus, rutting factor, and creep stiffness of the asphalt mortar also increased, indicating improved rheological, stiffness, and elastic properties. GT was found to pose no risk for large-scale use as a building material and can offer substantial economic benefits. The study concludes that utilizing GT in asphalt pavement engineering benefits environmental protection.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":null,"pages":null},"PeriodicalIF":7.4000,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061824040017","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
The accumulation of graphite tailings (GT) in the tailings dam has caused severe damage to the ecological environment. This study investigates the feasibility of using GT as an alternative aggregate to fine aggregates (FA) in asphalt mortar. Various analytical tools, including a laser particle size analyzer, scanning electron microscope, X-ray diffractometer, and X-ray fluorescence, were utilized to characterize the properties of GT and FA. Asphalt mortar was prepared with four aggregate/asphalt weight ratios (0.3, 0.6, 0.9, 1.2). Scanning electron microscopy and FTIR spectroscopy were used to analyze the asphalt mortar's surface morphology and blending mechanism. The rheological properties of the asphalt mortar were evaluated using rotational viscosity test, dynamic shear rheological test, and bending beam rheological test. The environmental and economic aspects of GT were assessed through leaching toxicity and cost-benefit analysis. The results showed that GT has larger particle size and rougher surface, promoting better bonding with asphalt. With increasing GT content, the viscosity, complex modulus, rutting factor, and creep stiffness of the asphalt mortar also increased, indicating improved rheological, stiffness, and elastic properties. GT was found to pose no risk for large-scale use as a building material and can offer substantial economic benefits. The study concludes that utilizing GT in asphalt pavement engineering benefits environmental protection.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.