scholarly journals Behavior of the Dynamic Modulus and Fatigue in Asphalt Mixtures with Blast Oxygen Furnace Slag and Blast Furnace Dust

2021 ◽  
Author(s):  
Ricardo Ochoa ◽  
Alfonso López ◽  
Gloria Grimaldo
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Dynamic Modulus ◽  
Fatigue Behavior ◽  
Asphalt Mixtures ◽  
Slight Reduction ◽  
Fine Aggregate ◽  
Iron Mineral ◽  
Blast Furnace Dust ◽  
Bof Slag

Slag from a Blast Oxygen Furnace (BOF) is produced during the transformation of cast iron, coming from the blast furnace, into steel during the integrated steelmaking process, just as blast furnace dust (BFD) is produced during the transformation of the iron mineral into cast iron. These residues have generated environmental problems due to the accumulation and inadequate disposal thereof. Consequently, this study aims to analyze the use and behavior of the dynamic modulus and the fatigue in asphalt mixtures with partial (50 %) and total (100 %) substitution of the coarse aggregate for BOF slag and the fine aggregate for BFD. The results are compared with the behavior of a mixture elaborated with conventional aggregates. To achieve this objective, the chemical and physical properties of BOF and BFD were determined along with the optimum asphalt cement content, determined using the Ramcodes methodology. Tests were carried out to evaluate the physical characteristics, the dynamic modulus, and the fatigue of each type of mixture. The results of this study demonstrate adequate fatigue behavior and a slight reduction in dynamic modulus in mixtures with BOF and BFD. This allows us to deduce that the use of these residues is feasible and thereby to contribute to sustainable development and the protection of the environment.

Research of Fatigue Behavior of Asphalt Pavement Materials with WMA and RAP

2013 ◽  
Vol 361-363 ◽  
pp. 1783-1786 ◽  
Author(s):  
Bao Yang Yu ◽  
Yu Wang ◽  
Zhong Hua Zhao
Keyword(s):  
Asphalt Concrete ◽  
Dynamic Modulus ◽  
Life Cycle Cost ◽  
Asphalt Pavement ◽  
Fatigue Behavior ◽  
Road Construction ◽  
Asphalt Mixtures ◽  
Traffic Load ◽  
Porous Asphalt ◽  
Form Of Life

With the development of chinas road construction, the increase of traffic and the traffic load the fatigue of asphalt pavement under the vehicle load has become one of the major disruption in the form of life of life of asphalt concrete directly affect the service life and the performance use of asphalt pavement ,it is a key factor to determine the life cycle cost of asphalt concrete pavement construction. The objectives of this paper are to characterize the fatigue behavior of porous asphalt pavement mixtures containing RAP and a WMA additive using Super pave gyratory compactor and dynamic modulus testing. Four types of asphalt mixtures were evaluated in this study. This study evaluated compaction energy index, permeability, indirect tensile strength, and dynamic modulus for all types of porous asphalt mixtures. All of the asphalt mixtures meet the typical minimum coefficient of permeability in this study.

scholarly journals Use of BOF slag and blast furnace dust in asphalt concrete: an alternative for the construction of pavements

DYNA ◽  
2018 ◽  
Vol 85 (206) ◽  
pp. 24-30 ◽  
Author(s):  
Alfonso López-Díaz ◽  
Ricardo Ochoa-Díaz ◽  
Gloria Elizabeth Grimaldo-León
Keyword(s):  
Blast Furnace ◽  
Asphalt Concrete ◽  
Blast Furnace Dust ◽  
Bof Slag

El auge de la construcción de grandes obras de ingeniería ha impulsado la demanda por acero, lo que ha generado un incremento en la producción de residuos siderúrgicos, una situación que causa problemas ambientales debido a la acumulación y no disposición adecuada de estos subproductos. El uso de materiales reciclados en diferentes procesos debe estar enfocado hacia el desarrollo sostenible y la protección del medio ambiente. Este trabajo se desarrolló con el objetivo de estudiar el uso de la escoria de horno al oxigeno (BOF) y el polvo de alto horno (AH) para fabricar mezclas asfálticas en caliente para pavimentos como una alternativa para mitigar los problemas ambientales derivados de la acumulación de residuos siderúrgicos y de la explotación de materiales no renovables, como la grava y la arena. Para lograr el objetivo, se analizaron tres tipos de mezclas asfálticas, una mezcla con materiales convencionales (control) y dos mezclas sustituyendo parcial y totalmente el agregado grueso por BOF y el agregado fino por polvo de AH. El diseño de las mezclas se realizó con la metodología Ramcodes, la cual se basa en el principio del polígono de vacíos. Se realizaron ensayos para evaluar las características físicas y la susceptibilidad al agua y deformación plástica de cada tipo de mezcla. Los resultados de este estudio indican que es factible el uso de los residuos siderúrgicos analizados para reemplazar parcialmente los agregados convencionales en la pavimentación de carreteras.

scholarly journals Increasing the efficiency of blast-furnace smelting by improving the quality of iron ore materials

2019 ◽  
pp. 43-60
Author(s):  
A.S. Nesterov ◽  
L.I. Garmash
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Chemical Composition ◽  
Coke Consumption ◽  
Iron Ore ◽  
Raw Materials ◽  
Blast Furnace Smelting ◽  
Blast Furnace Dust ◽  
Sinter Mixture

It is noted in the work that when mastering the technology of pulverized coal injection (PUT) at the metallurgical enterprises of Ukraine, it is necessary to intensify work, including research, in the direction of improving the quality characteristics of the sinter, the stability of its chemical composition and strength parameters. The analysis of the quality of iron ore raw materials used in sintering production in Ukraine and foreign countries is carried out. The requirements of international and domestic standards for the quality of raw materials and fuels, providing for the injection of large quantities of firearms into the furnace, are given. A methodology for determining the quality of raw materials developed in the HMI is described. The results of a study of the quality of iron ore raw materials according to the developed method are presented. Based on the analysis of the results of the research, requirements were developed for the quality of granular iron ore wastes and their rational amount in the composition of the sinter charge, and the process for the production of granules was developed. Recommendations have been developed on the use in the sinter mixture of a part of the granular components of secondary waste, which allowed to increase the content of secondary resources in the mixture. As a result, the chemical composition of the sinter was stabilized, its strength was improved, the yield of sinter of the second grade was reduced, the removal of blast furnace dust and coke consumption were reduced. Improving the quality of the sinter and the rational distribution of charge materials over the cross-section of the top of the blast furnace allows for self-renewal of the protective skull, to reduce the removal of top dust by 4.3 kg / t of cast iron, and to reduce coke consumption by 19.6 kg / t of cast iron. The developed measures make it possible to increase the competitiveness of products, even at the additional cost of preparing the sinter mixture for sintering.

Use of Superpave Technology for Design and Construction of Rubberized Asphalt Mixtures

1997 ◽  
Vol 1583 (1) ◽  
pp. 71-81 ◽  
Author(s):  
H. Barry Takallou ◽  
Hussain U. Bahia ◽  
Dario Perdomo ◽  
Robert Schwartz
Keyword(s):  
Fatigue Behavior ◽  
Permanent Deformation ◽  
Performance Testing ◽  
Fatigue Cracking ◽  
Asphalt Mixtures ◽  
Mix Design ◽  
Asphalt Rubber ◽  
Constant Height ◽  
Overlay Design ◽  
Gyratory Compaction

The effect of different mixing times and mixing temperatures on the performance of asphalt-rubber binder was evaluated. Four different types of asphalt-rubber binders and neat asphalt were characterized using the Strategic Highway Research Program (SHRP) binder method tests. Subsequently, mix designs were carried out using both the SHRP Levels I and II mix design procedures, as well as the traditional Marshall mix design scheme. Additionally, performance testing was carried out on the mixtures using the Superpave repetitive simple shear test at constant height (RSST-CH) to evaluate the resistance to permanent deformation (rutting) of the rubberized asphalt mixtures. Also, six rectangular beams were subjected to repeated bending in the fatigue tester at different microstrain levels to establish rubberized asphalt mixtures’ resistance to fatigue cracking under repeated loadings. The results indicate that the Superpave mix design produced asphalt-rubber contents that are significantly higher than values used successfully in the field. Marshall-used gyratory compaction could not produce the same densification trends. Superpave mixture analysis testing (Level II) was used successfully for rubberized asphalt mixtures. Results clearly indicated that the mixture selected exhibited acceptable rutting and fatigue behavior for typical new construction and for overlay design. Few problems were encountered in running the Superpave models. The results of the RSST-CH indicate that rubber-modified asphalt concrete meets the criteria for a maximum rut depth of 0.5 in.; and more consistent results were measured for fatigue performance analysis using the repeated four-point bending beam testing (Superpave optional torture testing). The cycles to failure were approximately 26,000 at 600 microstrain.

Precision Analysis of Sigmoidal Master Curve Model for Dynamic Modulus of Asphalt Mixtures

2018 ◽  
Vol 30 (11) ◽  
pp. 04018290 ◽  
Author(s):  
Ningyi Su ◽  
Feipeng Xiao ◽  
Jingang Wang ◽  
Serji Amirkhanian
Keyword(s):  
Dynamic Modulus ◽  
Master Curve ◽  
Asphalt Mixtures ◽  
Precision Analysis ◽  
Curve Model
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