Abstract
The growth of aquaculture has increased the production of oysters. However, the increased oyster shell volume has created serious environmental and recycling problems for the society. In order to study the sustainable utilization of waste oyster shells, asphalt binder of waste oyster shell powder was prepared by using modified asphalt material with waste oyster shells. The microstructure of oyster shell powder was analyzed by scanning electron microscopy experiments. The chemical composition of the asphalt binder was observed by Fourier transform infrared spectroscopy tests. The physical properties of the asphalt binder, including softness, high-temperature performance, and plastic deformation capacity, were initially evaluated through three indicators’ tests on asphalt. A preliminary performance evaluation of the asphalt binder was performed. The high-temperature stability of asphalt binders was evaluated using dynamic shear rheometry. The rutting resistance of the material was evaluated by temperature sweep tests, and the shear deformation resistance of the material was evaluated by frequency sweep tests. Multiple stress creep recovery tests determine the material’s ability to resist permanent deformation. The low-temperature rheological properties were evaluated by bending beam rheology tests. The study found that the waste oyster shell powder is a biomass with a porous irregular petal shape. No new characteristic absorption peaks are formed by mixing with asphalt. And, it can improve the viscosity, thermal stability, and temperature-sensitive properties of the material. It significantly improved the high-temperature rheological performance, rutting coefficient, and recovery elasticity of the material. However, it has little effect on low-temperature rheological performance. This study provides a solid foundation for the effective use of biowaste in engineering materials.
Highlights
Economic development and increasing consumption levels have led to a yearly increase in the global generation of municipal domestic waste [1, 2]
Since research on bio-modified asphalt has focused on several aspects of plantbased modified, bio-oil modified and bio-shell modified [39]. e performance advantages of oyster shell powder asphalt binders were further clarified by comparing the differences in the effects of different bio-modified materials on asphalt performance
Oyster shell powder asphalt binder was influenced by the amount of shell powder admixture, and the physical properties of the material changed with the increase of shell powder admixture
Summary
Economic development and increasing consumption levels have led to a yearly increase in the global generation of municipal domestic waste [1, 2]. Due to its high water content and perishable nature, this waste can damage the ecological environment. It contains a large amount of biomass energy, which is a valuable renewable resource [3, 4]. Oyster products are widely distributed and have high organic component content. Many oyster shells are discarded during processing and consumption without effective exploitation, and they have become a serious source of pollution [5]. Competitive inhibitors against the angiotensin-converting enzyme have been developed by isolating functional peptides from oyster shell hydrolysis products [7]. In the field of biomedicine, oyster shells have been used for the development of anti-ACE competitive inhibitors [9]. In the field of environmental science, oyster shells have been used for marine environment
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