scholarly journals Degradation Prediction Model for Friction of Road Pavements with Natural Aggregates and Steel Slags

2019 ◽  
Vol 10 (1) ◽  
pp. 32 ◽  
Author(s):  
Bruno Crisman ◽  
Giulio Ossich ◽  
Paolo Bevilacqua ◽  
Roberto Roberti
Keyword(s):  
Residual Life ◽  
Steel Slag ◽  
Steel Production ◽  
Threshold Level ◽  
Skid Resistance ◽  
Concrete Pavements ◽  
Cumulative Number ◽  
The Road ◽  
On The Road ◽  
Natural Aggregates

Steel production wastes (steel slags) are used more often in asphalt concrete pavements as a valuable replacement for natural aggregates, which are becoming increasingly rare. In this paper authors investigate the polishing characteristics of aggregates, and in particular of steel slags, used in bituminous road surfacing, are a major factor in determining the resistance to skidding. The main purpose of the study is the identification of a suitable degradation model, based on friction indicators, in the laboratory, as well as the comparison of in-situ pavement skid resistance with the cumulative number of passing vehicles over the years. The model predicts the expected resistance to skidding of the road surface based on the knowledge of the polished stone value (PSV) of the aggregates and the expected traffic on the road. In this study, several types of aggregates were compared: steel slag, limestone, limestone and slag mixture, diabase, Criggion stone and basalt. Using a standard PSV test, it was found that the aggregates did not reach the lower value of skid resistance (equilibrium value). The analysis of the British Portable Number (BPN) data versus polishing time allowed to empirically derive a regression model for each investigated aggregate. Hence, it appears possible to define both an investigatory level and threshold level to predict the actual residual life of the pavement from the examination of skid resistance.

scholarly journals A Review on Behaviour of Beam Column Joint Using EAF Steel Slag Concrete

2021 ◽  
Author(s):  
Ajmal Khan R ◽  
Rekha Ambi
Keyword(s):  
Steel Slag ◽  
Steel Production ◽  
Concrete Pavements ◽  
Conventional Concrete ◽  
Load Carrying ◽  
Column Joint ◽  
Eaf Slag ◽  
Natural Aggregates ◽  
The Impact ◽  
Recycled Material

The amount of industrial waste generated and the overexploitation of quarries worldwide are becoming one of the serious environmental problem. Electric Arc Furnace (EAF) steel slag is currently used for asphalt concrete pavements in many countries but huge quantities of this material are still landfilled. Reusing the slag as recycled material in the construction industry not only helps in the reduction of the amount of waste disposed off but can also bring down the consumption of natural aggregates. EAF slag is the secondary product of the steel production process and is procured after the separation of molten steel from impurities. In this review paper, the impact of using EAF concrete on the structural behavior of internal beam-column joints and also the resisting mechanism of these joints are studied. A parametric study on the structural performance of EAF concrete compared to conventional concrete in terms of the load-carrying capacity, energy dissipation and strength attained by the joint in failure condition is made.

Strategies for Promoting the Use of Concrete Pavements in Tanzania: Technical and Institutional Considerations

2008 ◽  
Vol 31 (1) ◽  
pp. 53-62
Author(s):  
D.A. Mfinanga ◽  
H. Bwire
Keyword(s):  
Road Construction ◽  
Cost Effective ◽  
Petroleum Products ◽  
Concrete Pavements ◽  
Construction Technology ◽  
The Road ◽  
Competing Demands ◽  
Resource Requirements ◽  
On The Road ◽  
Economic Developments

High-type roads in Tanzania have been predominantly of asphaltic concrete construction. This ever enlarging and ageing asphaltic road network represents increasing resource requirements on the road agency in the form of maintenance. Limited resources coupled with the ever sky-rocketing costs of petroleum products and the competing demands of social economic developments, presupposes the need to look for alternative road construction technology that is more cost-effective and resource optimising. Experience gained from developed and some developing countries where concrete pavements have been widely used suggests the potential of this type of pavement in many developingcountries. This paper discusses the technical aspects of design and construction- and maintenance-related aspects of concrete pavements. The discussion extends further to highlight issues pertaining to the performance of concrete pavements and strategies for promoting the use of concrete pavements in Tanzania. Conclusions and recommendationsare made with suggestions on how to start implementing the proposed strategies.

scholarly journals Thermal Analysis of Asphalt Concrete Pavements Heated with Amorphous Metal Technology

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Cesare Sangiorgi ◽  
Cecilia Settimi ◽  
Piergiorgio Tataranni ◽  
Claudio Lantieri ◽  
Solomon Adomako
Keyword(s):  
Amorphous Material ◽  
Concrete Pavements ◽  
Road Maintenance ◽  
Warm Up ◽  
Physical Methods ◽  
The Road ◽  
Road Pavement ◽  
Heating Device ◽  
Critical Issues ◽  
On The Road

Undoubtedly, the most commonly used method for road maintenance includes the use of winter service vehicles to clear thoroughfares of snow and the spraying of chemicals to prevent ice formation on the road surface. The application of these traditional methods on road and airport pavements possesses numerous environmental, organizational, and technical challenges. To overcome these critical issues, new nontraditional technologies that act within the pavement, thereby increasing its temperature, have been developed. In relation to the heat source used, these are classified into chemical and physical methods. The purpose of this research is to study the temperature variation under the thermal transient process produced by the action of the physically heating device installed in the road pavement. The heating device is a ribbon, made of amorphous material, which is able to produce heat to warm up the pavement and its surface. Based on its principle of operation, it is classified among the nontraditional physical methods for the treatment of snow and ice. In this work, the performance of the heating ribbons on an experimental site at the G. Marconi International Airport in Bologna (Italy) is presented.

scholarly journals Analysis of the costs of construction and maintenance of rigid and flexible pavements

2018 ◽  
Vol 2018 (11) ◽  
pp. 31-42
Author(s):  
Antoni Szydło ◽  
Piotr Mackiewicz
Keyword(s):  
Road Network ◽  
Price Level ◽  
Asphalt Mixtures ◽  
Cost Assessment ◽  
Concrete Pavements ◽  
Cement Concrete ◽  
The Road ◽  
The Subject ◽  
On The Road ◽  
The Cost

The costs of construction and the future maintenance of expressways and motorways have a significant impact on the choice of technologies for their construction. The subject of the article is the analysis of the costs of construction and maintenance of rigid (concrete) and flexible (asphalt mixtures) pavements in Poland. The construction technologies and maintenance scenarios in service were analysed for selected pavement constructions of rigid and flexible motorways and expressways. The costs of construction and maintenance of these pavements in national conditions were determined. The fourth quarter of 2015 was adopted as the initial price level. On the basis of the analysis of the costs of construction and maintenance of the analysed structures, the advantage of rigid constructions made of cement concrete was demonstrated, especially in the aspect of the surface maintenance. The cost assessment was carried out for 30 years of exploitation. The concrete pavements on the road network in Poland have been used for over 20 years. They are present both on low-class roads and on the highest-class roads, i.e. motorways and expressways.

scholarly journals DEFINING OF EAF STEEL SLAG APPLICATION POSSIBILITIES IN ASPHALT MIXTURE PRODUCTION / ELK PLIENO ŠLAKO PANAUDOJIMO GAMINANT ASFALTO MIŠINĮ GALIMYBĖS / ВОЗМОЖНОСТИ ПРИМЕНЕНИЯ СТАЛЬНОГО ШЛАКА ИЗ ДУГОВОЙ СТАЛЕПЛАВИЛЬНОЙ ПЕЧИ ДЛЯ ПРОИЗВОДСТВА АСФАЛЬТОВОЙ СМЕСИ

2011 ◽  
Vol 19 (2) ◽  
pp. 148-157 ◽  
Author(s):  
Tahir Sofilic ◽  
Ana Mladenovič ◽  
Una Sofilič
Keyword(s):  
Structural Characteristics ◽  
Heavy Traffic ◽  
Steel Slag ◽  
Steel Production ◽  
Asphalt Mixtures ◽  
Spectrometric Analysis ◽  
Steel Mill ◽  
Regular Production ◽  
Eaf Slag ◽  
Natural Aggregates

Electric arc furnace (EAF) steel slag, generated from carbon steel production process, is the most interesting from the asphalt technology point of view. This paper aims to explore the feasibility of utilizing steel slag as aggregates in asphalt mixtures. Characterization of EAF slag was carried out through examination of its physical and chemical properties with special emphasis on chemical and structural characteristics. Optical Microscopy (OM), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometry (EDS) and γ-spectrometric analysis were employed to study the texture, morphology and composition of steel slag. Volume properties of steel slag were also evaluated as compared to those of natural aggregates. For this purpose the specimens of EAF slag were taken from the regular production processes in CMC Sisak, Croatia, Steel mill. The results which were obtained by testing geometric, physicalmechanic properties, as well as the properties of duration on the specimen of electric furnace steel slag of CMC Sisak, when compared to steel slag properties of other steel producers (Acroni, Jesenice, Slovenia and Štore Steel, Štore, Slovenia) and with properties of natural aggregates, have satisfied the conditions for manufacturing mixtures of the tested steel slag and natural stone, which can be used in asphalt production. In comparison to the natural aggregates, which are used in asphalt mixtures on highways and roads with heavy traffic, the examined steel slag has equally good physical and mechanical properties, while it is significantly better when it comes to resistance to polishing. Special attention has been given to the free CaO and free MgO, which can cause volume instability, thus limiting the use of steel slag in road construction. Santrauka Nagrinėjamos plieno šlako panaudojimo asfalto mišiniui gaminti galimybės. Šis šlakas susidaro elektros lanko krosnyje (ELK) anglies plieno gamybos procese. Nagrinėjamos fizikinės bei cheminės šlako savybės, pateikiamos cheminės ir struktūrines charakteristikos. Plieno šlako tekstūra, morfologija ir sudėtis nustatyta taikant optinę mikroskopiją (OM), rentgeno spindulių difrakciją (RSD), skenuojančiąją elektroninę mikroskopiją (SEM), energijos dispersinę spektrometriją (EDS) bei spektrometrinę analizę. ELK šlako mėginiai buvo paimti iš plieno gamyklos CMC Sisak, Kroatijoje. Šių mėginių geometrinės, fizikinės ir mechaninės bei patvarumo savybės buvo lyginamos su kitų šlakų (Acroni, Jesenice, Slovenija ir Store steel, Štore, Slovėnija) ir natūralių agregatų savybėmis. Gauti rezultatai patvirtino tirto plieno šlako bei natūralaus akmens panaudojimo gaminant asfaltą galimybes. Natūralūs agregatai, naudojami asfalto mišiniuose tiesiant greitkelius ir intensyvaus eismo kelius, bei tiriamas plieno šlakas turi panašių gerų fizikinių bei mechaninių savybių, tačiau ELK šlakas yra atsparesnis gludinimui. Daug dėmesio buvo skirta laisviesiems CaO ir MgO, lemiantiems medžiagos nepatvarumą. Šie oksidai yra pagrindinis veiksnys, ribojantis plieno šlako naudojimą asfaltui gaminti. Резюме В статье ставилась цель исследовать возможности применения стальных шлаков, образующихся в процессе производства стали в дуговой сталеплавильной печи (ДСП), для производства асфальтовой смеси. Исследовались физические и химические свойства шлака из ДСП. Текстура, морфология и состав стального шлака определялись с использованием оптической микроскопии, дифракции рентгеновских лучей, электронной микроскопии, энергодисперсной спектрометрии и γ-спектрометрического анализа. Образцы шлака из ДСП были взяты на заводе по производству стали в Хорватии. Геометрические, физико-механические и прочностные свойства образцов сравнивались со свойствами других шлаков (из Словении) и с натуральными материалами. Полученные результаты подтвердили возможность применения шлака исследованной стали и натурального камня для производства асфальтовой смеси. Натуральные материалы, применяемые в асфальтовых смесях при строительстве магистралей и дорог с интенсивным движением, и исследованный стальной шлак обладают приблизительно одинаковыми хорошими физико-механическими свойствами, однако шлак из ДСП более устойчив при шлифовании. При анализе большое внимание также уделялось свободным CaO и MgO, вызывающим нестабильность материала. Эти оксиды являются основным фактором, лимитирующим применение стального шлака при производстве асфальта.

scholarly journals Compaction Procedures and Associated Environmental Impacts Analysis for Application of Steel Slag in Road Base Layer

2021 ◽  
Vol 13 (8) ◽  
pp. 4396
Author(s):  
Bo Gao ◽  
Chao Yang ◽  
Yingxue Zou ◽  
Fusong Wang ◽  
Xiaojun Zhou ◽  
...  
Keyword(s):  
Environmental Impacts ◽  
Steel Slag ◽  
Base Layer ◽  
Land Occupation ◽  
Additional Energy ◽  
Vibration Period ◽  
The Road ◽  
Road Base ◽  
Natural Aggregates ◽  
Pavement Construction

In recent years, recycling steel slag is receiving growing interest in the road base layer construction field due to its role in alleviating land occupation and resource shortages. However, the mixture compaction and its environmental impact on practical construction sites remain unclear, which may hinder the application of steel slags in road layers. This study investigates the pavement construction of the ‘Baotou-Maoming’ motorway, located in Inner Mongolia, China, analyzing the compaction procedures and assessing the environmental impacts caused by the road base layer containing steel slag. Firstly, mechanical properties and texture appearances of the steel slag aggregates are characterized. Afterwards, the comparative assessments for steel slag and andesite layers compaction are quantified from equivalent CO2 emission and energy consumption aspects, respectively. The results show that the steel slag has a better surface texture than the natural aggregates; physical properties including compactness, flatness and compressive strength comply with the requirements for applying steel slag to a hydraulically bound mixture. Compared to the base layer using andesite aggregates, the compaction vibration period of the course containing steel slags should be reduced to achieve a proper density due to the “hard-to-hard” effect that occurs between the adjacent steel slag particles. Consequently, the additional energy and the equivalent CO2 are generated at 2.67 MJ/m3 and 0.20 kg/m3, respectively.

scholarly journals Study on the effect of Acid Rain erosion on the Road performance of Steel Slag Asphalt mixture

2021 ◽  
Vol 1972 (1) ◽  
pp. 012108
Author(s):  
Yi Luo Zhang ◽  
Zhao Wang ◽  
Guo Pu Liu ◽  
Yuan De Kou
Keyword(s):  
Acid Rain ◽  
Steel Slag ◽  
Asphalt Mixture ◽  
The Road ◽  
Road Performance ◽  
On The Road ◽  
Rain Erosion

Development and Performance of the Portable Skid Resistance Tester

1965 ◽  
Vol 38 (4) ◽  
pp. 840-862 ◽  
Author(s):  
C. G. Giles ◽  
B. E. Sabey ◽  
K. H. F. Cardew
Keyword(s):  
Field Trials ◽  
Test Surface ◽  
Skid Resistance ◽  
Textured Surfaces ◽  
Basic Principles ◽  
The Road ◽  
Factors Influencing ◽  
On The Road ◽  
And Performance ◽  
Patterned Tire

Abstract The portable skid-resistance tester can carry out a wide variety of measurements on the road and in the laboratory. This paper outlines the basic principles underlying the design of the tester and describes the laboratory and field trials conducted during the development of the instrument. The factors influencing its performance are emphasized. In its performance, the instrument behaves as a patterned tire skidding at 30 mph. It is particularly well suited for testing rough-textured surfaces, and readings are independent of gradient, camber, or crossfall on the test surface.

scholarly journals Polyfunctional Modifiers for Bitumen and Bituminous Materials with High Performance

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Alim Feizrakhmanovich Kemalov ◽  
Ruslan Alimovich Kemalov ◽  
Ilmira Maratovna Abdrafikova ◽  
Pavel Sagitovich Fakhretdinov ◽  
Dinar Zinnurovich Valiev
Keyword(s):  
Asphalt Concrete ◽  
High Performance ◽  
Concrete Pavements ◽  
Complex Action ◽  
The Road ◽  
Heavy Trucks ◽  
High Adhesion ◽  
On The Road ◽  
Road Paving

Over the last decade increase in capacity and the intensity of vehicular traffic has increased manifoldly, including heavy trucks, super singles, and higher tire pressures, resulting in significant increase of dynamic loads on the road surface which in turn lead to high quality requirements for bitumen in order to avoid premature wear and failure of asphalt concrete pavements. One of the possibilities to increase the quality of bitumen is to use special additives and modifiers that can provide a high adhesion to mineral filler and inhibit the aging and degradation processes in the asphalt coating. To achieve this, in the present study composite modifiers based on bisimidazolines derivatives were synthesized. The developed polyfunctional modifier (PFM) of complex action provides enhanced thermal stability, significantly improves the adhesion between bitumen binder and aggregates, and also improves the physical-mechanical properties of the asphalt concrete. Based on the test results it is recommended to use the synthesized samples of the PFM additive with complex action in asphalt mixtures for road paving.

Performance Evaluation of an Innovative High-Friction Surface Treatment

2019 ◽  
Vol 2673 (3) ◽  
pp. 485-493
Author(s):  
Xiaoyu W. Chen ◽  
Michele A. Lanotte ◽  
M. Emin Kutay ◽  
Larry Galehouse
Keyword(s):  
United States ◽  
Surface Treatment ◽  
Friction Surface ◽  
Low Cost ◽  
Surface Characteristics ◽  
Cost Effective ◽  
The United States ◽  
Skid Resistance ◽  
The Road ◽  
On The Road

High-friction surface treatment (HFST) is effective for improving pavement surface characteristics and enhancing drivers’ safety on the road. However, common HFST applications are not cost-effective and provide only limited preservation benefits to the existing pavement structure. In this study, the performance of a new HFST, consisting of corundum sand and waterborne epoxy, has been evaluated through laboratory testing. A battery of laboratory tests was performed to compare this new HFST against three common HFST applications used in the United States. Three aspects of the performance were investigated: (i) improvement of skid resistance, (ii) durability to environmental effects (moisture damage and freeze–thaw cycles), and (iii) the effect on an existing crack through semi-circular bending tests. The results showed that the application of the low-cost HFST provides an improvement of skid resistance as good as or better than the traditional HFST applications. Furthermore, since the aggregates used in this technique are much finer than the traditional HFST applications, the treatment looks more like a slurry, and it has the potential to fill the existing cracks with a width of 1.5 ± 0.1 mm and retard further propagation of the cracks. Results revealed that this new HFST technology (developed by a Chinese manufacturer) has the potential to lower the cost compared with materials and practices currently used in the United States.

Sign in / Sign up

Export Citation Format

Share Document