scholarly journals Characteristics of Different Types of Basic Oxygen Furnace Slag Filler and its Influence on Properties of Asphalt Mastic

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4034 ◽  
Author(s):  
Dezhi Kong ◽  
Shaopeng Wu ◽  
Meizhu Chen ◽  
Meiling Zhao ◽  
Benan Shu
Keyword(s):  
Chemical Composition ◽  
Asphalt Mixture ◽  
Basic Oxygen Furnace ◽  
Stiffness Modulus ◽  
Limestone Filler ◽  
Basic Oxygen ◽  
Asphalt Mastic ◽  
Different Types ◽  
Bof Slag ◽  
Basic Oxygen Furnace Slag

The fillers of ordinary and pyrolytic basic oxygen furnace (BOF) slag were selected to investigate the properties of their asphalt mastic. XRF (X-Ray Fluorescence) was used to analyze chemical composition of fillers. Meanwhile, SEM (Scanning Electron Microscope) and AIMS (Aggregate Image Measurement System) were utilized to explore meso-morphology, angularity and sphericity. Penetration, softening point and viscosity of asphalt mastic were discussed, while the rheological properties of asphalt mastic were studied by means of DSR (dynamic shear rheometer) and BBR (bending beam rheometer) tests. The experimental results show that chemical composition of different types of BOF slag is similar. The grinding energy consumption of pyrolytic BOF slag is higher than that of limestone and ordinary BOF slag. It is not recommended that pyrolytic BOF slag filler is produced by grinding process. The micro-texture structure of ordinary BOF slag filler is more abundant and their angularity index is about 15% higher than that of limestone filler. The stiffness modulus and rutting factor of asphalt mastic with ordinary BOF slag filler is higher than that of limestone filler. Meanwhile the incorporation of BOF slag filler will further reduce the low-temperature flow performance of asphalt mastic. The effect of pyrolytic BOF slag filler on the performance of asphalt mastic is less than that of ordinary BOF slag. Ordinary BOF slag filler can effectively improve high temperature anti-rutting stability of asphalt mixture. Ordinary BOF slag has a useful application prospect as filler in asphalt mixture.

scholarly journals Component Modification of Basic Oxygen Furnace Slag with C4AF as Target Mineral and Application

2021 ◽  
Vol 13 (12) ◽  
pp. 6536
Author(s):  
Yanrong Zhao ◽  
Pengliang Sun ◽  
Ping Chen ◽  
Xiaomin Guan ◽  
Yuanhao Wang ◽  
...  
Keyword(s):  
Intermediate Phase ◽  
Raw Materials ◽  
Activity Index ◽  
Basic Oxygen Furnace ◽  
Hydration Products ◽  
Basic Oxygen ◽  
Bof Slag ◽  
Mineral Compositions ◽  
Slag Component ◽  
Basic Oxygen Furnace Slag

In this paper, a new method of basic oxygen furnace (BOF) slag component modification with a regulator was studied. The main mineral was designed as C4AF, C2S and C3S in modified BOF slag, and the batching method, mineral compositions, hydration rate, activation index and capability of resisting sulfate corrode also were studied. XRD, BEI and EDS were used to characterize the mineral formation, and SEM was used to study the morphology of hydration products. The results show that most inert phase in BOF slag can be converted into active minerals of C4AF and C2S through reasonable batching calculation and the amount of regulating agent. The formation of C4AF and C2S in modified BOF slag is better, and a small amount of MgO is embedded in the white intermediate phase, but C3S is not detected. With the increase in the CaO/SiO2 ratio in raw materials, the CaO/SiO2 ratio of calcium silicate minerals in modified BOF slag increases, the contents of f-CaO are less than 1.0%, and the activity index improves. Compared with the BOF slag, the activity index and exothermic rate of modified BOF slag improved obviously, and the activity index of 90 days is close to 100%. With the increase in modified BOF slag B cement, the flexural strength decrease; however, the capability of resisting sulfate corrode is improved due to the constant formation of a short rod-like shape ettringite in Na2SO4 solution and the improvement of the structure densification of the hydration products.

scholarly journals Utilization of Basic Oxygen Furnace Slag in Geopolymeric Coating for Passive Radiative Cooling Application

2020 ◽  
Vol 12 (10) ◽  
pp. 3967 ◽  
Author(s):  
Chia-Ho Wu ◽  
Chih-Hong Huang ◽  
Yeou-Fong Li ◽  
Wei-Hao Lee ◽  
Ta-Wui Cheng
Keyword(s):  
Layer Structure ◽  
Research Work ◽  
Temperature Drop ◽  
Basic Oxygen Furnace ◽  
Radiative Cooling ◽  
Portland Cement Concrete ◽  
Basic Oxygen ◽  
Bof Slag ◽  
Basic Oxygen Furnace Slag ◽  
Furnace Slag

Basic oxygen furnace slag (BOFs) is difficult to reutilize because it contains excessive free lime, and thus causes serious expansion. For this reason, how to reuse BOF slag has turned out to be an imperative issue in order to meet the concept of a circular economy. The key intention of this research work is to develop a new way to reutilize BOF slag, which due to its high emissivity in the 8–13 µm wavelength range, can be used as a sustainable, passive radiative cooling material. Passive radiative cooling, without the consumption of any energy, achieves the cooling of a surface by reflecting the sunlight and radiating the heat throughout the outer space (not absorbed by the atmosphere). BOF slag is used as a radiative cooling material in geopolymeric coating. This coating possesses an emissivity of 0.95 within the range of 8–13 µm and also has high conductivity, but its gray appearance absorbs too much heat. Therefore, by improving the situation through a double-layer structure, a temperature drop of 5.9 °C was reached compared to non-coated concrete under simulated sunlight, simultaneously with a low heating rate and high cooling rate. Besides, the binding strength between the geopolymeric coating and Portland cement concrete is comparable to two commercial organic paints. It is highly probable that the utilization of BOF slag in geopolymeric coating is energy saving and also feasible for passive radiative cooling applications. Hence, it can greatly decrease indoor temperature and improve the comfort of people living in buildings.

Applying Basic Oxygen Furnace Slag in Porous Asphalt Pavement

2011 ◽  
Vol 243-249 ◽  
pp. 4195-4200 ◽  
Author(s):  
Jyh Dong Lin ◽  
C. T. Hung ◽  
Shih Huang Chen ◽  
Ming Chin Yeh
Keyword(s):  
Swelling Pressure ◽  
Basic Oxygen Furnace ◽  
Basic Oxygen ◽  
Porous Asphalt ◽  
New Process ◽  
Porous Pavement ◽  
Bof Slag ◽  
Perpetual Pavement ◽  
Pavement Construction ◽  
Basic Oxygen Furnace Slag

The benefit using BOF slag on Perpetual Pavement that has been developed in United States and Europe recently, will effectively increasing Rutting and Skid Resistance of Pavement, reducing the amount of asphalt that used on Mix Design that will reduce the overall construction cost. The character of BOF slag has higher density and Hydrophilic, this study applied it to porous pavement. It compared with the performance of traditional aggregates. Based on the result, there are no significant differences. The BOF slag will be expansion with water, it was bad in pavement construction. Through swelling pressure test, the BOF slag with new process is no significant change in water. So, BOF slag is suitable in porous pavement.

Effect of hydration and silicone resin on Basic Oxygen Furnace slag and its asphalt mixture

2016 ◽  
Vol 112 ◽  
pp. 392-400 ◽  
Author(s):  
Zongwu Chen ◽  
Shaopeng Wu ◽  
Yue Xiao ◽  
Wenbo Zeng ◽  
Mingwei Yi ◽  
...  
Keyword(s):  
Asphalt Mixture ◽  
Basic Oxygen Furnace ◽  
Silicone Resin ◽  
Basic Oxygen ◽  
Basic Oxygen Furnace Slag ◽  
Furnace Slag

scholarly journals Research Progress on Skid Resistance of Basic Oxygen Furnace (BOF) Slag Asphalt Mixtures

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2169
Author(s):  
Song Li ◽  
Rui Xiong ◽  
Jiahui Zhai ◽  
Kaiyin Zhang ◽  
Wenyu Jiang ◽  
...  
Keyword(s):  
Material Properties ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Basic Oxygen Furnace ◽  
Asphalt Mixtures ◽  
Environmental Benefits ◽  
Research Progress ◽  
Skid Resistance ◽  
Basic Oxygen ◽  
Bof Slag

In order to ensure the safety of traffic, asphalt pavement is commonly required to utilize aggregates with excellent anti-abrasion property. This results in the lack of high-quality aggregates. The incorporation of solid waste in the aggregates is regarded as a high potential alternative for solving this problem. Since its material properties, such as rough surface, high Polished Stone Value (PSV) and the excellent adhesion property of asphalt, Basic Oxygen Furnace (BOF) slag can effectively improve the skid resistance of asphalt mixtures. First, the material properties of BOF slag are reviewed in this study. Then, the skid resistance of asphalt mixtures and aggregates are commendably evaluated by the Polished Stone Value test, Wehner/Schulze Tester, Aachen Polishing Machine, British Pendulum Test and Sand Patch test. The physical and mechanical properties of BOF slag play a key role in asphalt mixtures. This review found that the skid resistance mechanism of the BOF slag asphalt mixture is governed by factors such as BOF slag properties, incorporation methods and gradation types. Finally, the economic and environmental benefits of BOF slag asphalt mixtures were discussed. In addition, the function of gas catalysis and the melting of ice and snow can be added to the BOF slag asphalt mixture for a cleaner development in engineering. Furthermore, the existing problems, research directions and corresponding measures in this field are directed towards more durable and functional asphalt pavement construction.

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