Road Bitumen Research Articles

Use of carbon black as a modifier for petroleum bitumen

The problem of recycling worn-out tires and recycling of solid carbon-containing residue from the pyrolysis of tires is considered. The possibility of processing carbon black from the pyrolysis of tires into a high-quality concentrate, which can serve as a raw material for modifying petroleum bitumen, has been shown. The nature of the interactions occurring between the components of carbon black and the matrix of petroleum road bitumens has been studied. The chemical interaction of carbon black with the bitumen matrix through unsaturated C=C bonds has been proven. The introduction of carbon black as a modifying additive leads to a significant change in the physical, mechanical and rheological properties of the resulting bitumen binder systems. Based on spectrometric studies, an assessment is made of the structural changes occurring in the original and modified bitumen during the production of modified bitumen binders. It has been established that with such modification, diffusion of aromatic hydrocarbons occurs from the bitumen component into the modifier particles. During the modification process, six-membered cyclic aromatic compounds are formed in the bitumen part, the composition of paraffin-naphthenic hydrocarbons changes, and sulfur compounds are formed that “transfer” from the modifier particles to the bitumen. Thus, in this study, the phenomenon of mutual diffusion between bitumen and CBWT modifier was confirmed using IR spectroscopy.

Study of the influence of aromatic hydrocarbons on the process of tar oxidation

Abstract This study examines the impact of polycyclic aromatic hydrocarbons on the oxidation of petroleum tar. An aromatic hydrocarbon concentrates isolated from extracts of selective oil purification using the polar industrial solvent N-methylpyrrolidone was employed as an additive to tar. The relationship between the softening temperature of oxidized bitumen and both the duration of oxidation and the properties of the initial raw material mixture was investigated. It has been established that the introduction of 10 wt.% aromatic additive will increase the oxidation rate by 6 °C/h. The conditions for producing road bitumen from the proposed raw material compositions were identified. The influence of polycyclic aromatic hydrocarbon concentrate on the qualitative characteristics of bitumen during the tar oxidation process was determined. Aromatic additive is similar to a plasticizer, and reduces the softening temperature of bitumen by 9 °C. But the combined oxidation of tar with an aromatic additive and a catalyst makes it possible to obtain bitumen with a softening point of 44 °C and a penetration of 80 x0.1 mm, which corresponds to the grade of bitumen 70/100. Analysis of the group composition of oxidized bitumen revealed that the aromatic additive facilitates the intensification of the tar oxidation process.

Relationship between chemical composition and VOCs emission potential of similar paving grade road bitumen

ABSTRACT Exposure to bitumen fumes of workers during road pavement is a subject of interest in the field of industrial hygiene. Improvements have been made to technical means of prevention, but recent studies have shown that exposures need to be reduced. The development of early diagnosis method able to assess the volatile organic compounds (VOCs) emission potential would therefore be useful. The objective of this study was to outline a possible relationship between the chemical composition of bitumen and VOCs emission during heating using thirteen 35/50 paving-grade bitumen samples used in France. The samples are similar regarding their physical properties, elemental and SARA compositions. Molecular analysis investigations show that they contain the same class of compounds but in different proportions. Thermal analyses revealed different capacities of volatiles release potential. The combination of these data allowed to establish a relationship between chemical composition and volatile emission, leading to the identification of two groups of samples. We suggest three parameters based on molecular weight distribution, thermogravimetric profile and hydrocarbon release capacity that may distinguish bitumen by their emission potential prior to road pavement application. They may contribute to a methodology aiming to prevent workers exposure to bitumen fumes.

INVESTIGATION OF SURFACE PROPERTIES OF MODIFIED BITUMEN COMPOSITIONS

One of the main reasons for premature destruction of road surfaces is the poor quality of road bitumen. An effective way to improve the quality of a bitumen binder is to modify it with polymer or surface-active additives. The goal is to determine the effect of the concentration of modifiers on surface tension in binary "bitumen-surfactant", "bitumen-polymer" and triple "bitumen-surfactant-polymer" systems. The methodology of the work included measuring the surface tension of modified bitumen systems depending on the quantitative content of additives in bitumen. Results and discussion: As follows from the analysis of the data obtained, in bitumen systems with a limited concentration of polymer AG-4I (C≤1 g/dm3), the effect of reducing surface energy at the interface with air is achieved by concentrating surfactants in the surface layer, which are part of the structure of the bitumen itself. The extreme nature of the change in surface tension was also recorded in AC-2 bitumen compositions. Conclusion: In the "bitumen-AG-4I-AS-2" triple systems, the change in the specific surface energy at the "liquid-gas" interface is not an additive value, taking into account the separate contribution of AG-4I and AS-2. The concentration threshold of additives to achieve a minimum surface tension varies in comparison with binary compositions. With the combined administration of AG-4I (C=1g/dm3) and AC-2 (C=1g/dm3), the surface tension decreased by 9.30 mN/m compared with unmodified bitumen.

A Review of Road Bitumen Modification Methods. Part 1 – Physical Modification

The information in this study is based on a thorough review of recent articles related to the production of binders for road construction and the improvement of their performance properties. The main attention is paid to the physical modification of road bitumen with polymer modifiers. The influence of the three main types of polymers (thermoplastics, elastomers, and thermoplastic elastomers) on the main physical and mechanical properties of bitumen-polymer compositions is shown. The main technological parameters and features of the physical modification of bitumen by different types of polymer modifiers have been determined.

The Problem of Road Bitumen Technological Aging and Ways to Solve It: A Review

This paper discusses the main features of technological aging of bitumen, in particular, the mechanisms and transformations that accompany this process. The main laboratory methods for modeling the above processes are considered. It is described how the technical essence of the methods has changed from the first developments to the present. A number of compounds that can be used as inhibitors of technological aging, including antioxidants and plasticizers, as well as some “natural” substances that have these properties, are presented.

Anti-ageing and rheological performance of bitumen modified with polyaniline nanofibres

Asphalt pavements represent the great majority of roads worldwide. However, the bitumen physico-chemical properties change due to ageing processes during both the production and service life of the asphalt mixes. In recent years, a completely new trend has been observed in the road engineering industry oriented to extending the service life of roads, bringing direct economic, ecological and social benefits. This work presents the possibility of inhibiting ageing of road bitumen by using polyaniline nanofibers (PANI_NFs) as well as enhancing its rheological properties examined with Linear Amplitude Sweep (LAS) as well as Multiple Stress Creep and Recovery (MSCR) tests. These results show that the application of PANI_NFs maintains the primary penetration value of bitumen short-term and long-term aged road bitumen at 88 % and 52 %, respectively. Moreover, bitumen modification with PANI_NFs reduces the softening temperature increase by 33 % and 24 %, respectively, and the viscosity increase of road asphalt by 50 % and 25 %, respectively. PANI_NFs also stabilised the bitumen surface adhesion force, determined with AFM, consequently confirming the enhanced resistance to ageing processes. In addition, changes in the carbonyl index, sulphoxide index and aromaticity of bitumen demonstrated that PANI_NFs inhibit oxidation and aromatisation reactions of its components. The tests indicated a 4-fold decrease in the degree of bitumen component oxidation after short-term ageing and a 33 % decrease after long-term ageing. FTIR analysis also showed a reduction in the degree of bitumen component aromatisation process of 79 % and 76 % for short-term and long-term ageing, respectively. The LAS and MSCR test results also showed that PANI_NFs had a beneficial impact on the resistance of the bitumen to fatigue and rutting. Overall, the study results suggest that PANI_NFs consitute a promising modifier for bitumen in terms of ageing inhibition and performance characteristics.

МОДИФІКУВАННЯ ДОРОЖНЬОГО БІТУМУ ГУМІНОВИМИ КИСЛОТАМИ

Modifying road bitumen of the BND 70/100 brand with humic acids was carried out. In particular, the influence of the duration of the process and the amount of addition on the quality characteristics of the binder was studied. It was established that humic acids negatively affect the plastic properties of bitumen (deteriorate the softening temperature, penetration, and ductility), positively affect its elasticity, and have practically no effect on the ability of the binder to adhere to the surface of the mineral material. The main modifying effect of humic acids is a positive effect on the processes of technological aging of road bitumen (the ability of bitumen to age is slowed down). In particular, residual penetration increases, ΔТ (change in softening temperature) decreases, and Δm (bitumen mass) practically does not change. To ensure the maximum positive impact, the optimal duration of modification and the amount of humic acids in the mixture with bitumen were determined.

The Effect of Filler and Modifier on the Fatigue Characteristics of Road Bitumen

The Effect of Filler and Modifier on the Fatigue Characteristics of Road Bitumen

Bitumen-Biopolymer Materials Modified with Polylactic Acid with Improved Physical and Chemical Properties

With the continuous expansion of the global automobile fleet, there is an escalating demand to enhance and maintain current road infrastructure. Given the information provided, there will be a growing demand for bitumen, a key raw material used in the manufacturing of asphalt. Bitumen may account for up to 60% of the total usage in asphalt production. This study aims to determine the effect of different content of polylactic acid (PLA) on the change in the chemical and physical properties of biopolymer bitumen during its modification. This study was carried out by using a sample of petroleum road bitumen from CASPI BITUM (Kazakhstan) and a sample of PLA from Zhejiang Hisun (China). As a part of the research, the change of quality indicators of biopolymer bitumen when adding 4%–10% of PLA to it has been established. The results showed that the values of the average molecular weight and average molar mass increased with increasing the content of PLA in biopolymer bitumen. In particular, when the PLA content in biopolymer bitumen increased up to 10%, the average molecular weight of the biopolymer bitumen increased from 1,263 to 2,759 Mw and the average molar mass increased from 1,215 to 1,395 Mn. It was shown that increasing the PLA content in biopolymer bitumen from 0% to 10% leads to an increase in the softening temperature from 47 to 70°C or ∼ 49%. It was found that all examined samples of biopolymer bitumen are characterized by increased plasticity at 25°C (>100 cm). It has been established that the addition of 8% PLA to bitumen allows one to obtain a biopolymer bitumen of optimal quality. The results obtained can be used to produce road biopolymer bitumen.

Modified Bitumen Materials from Kazakhstani Oilfield

The oil bitumen BND 90/130, produced at the “LLP SP Caspi Bitum” with the modifier, which consists of copolymer of ethylene with butyl acrylate and glycidyl methacrylate taken in an amount of 0.5–1.6 wt%, and the tire reclaim (4–20 wt%), which is the destructate of mesh elastomers of different chemical nature, was modified; possibility of using the developed bitumen-elastomer binders in road asphalt concrete was justified. Modification of bitumen with a copolymer of ethylene with butyl acrylate and glycidyl methacrylate leads to an improvement in the properties of road bitumen: the softening point, hardness, deformability at low temperatures, elasticity, and adhesion to metal and mineral filler increase. It was shown that ethylene with butyl acrylate and glycidyl methacrylate chemically interacts with the functional groups of bitumen asphaltenes through the epoxy group of glycidyl methacrylate. Analysis of the spectra and group composition indicates an increased content of high molecular weight asphaltenes in the modified bitumen with a slight increase in structuring resins. It has been established that bitumen modified with rubber crumbs of 0.6–1.0 mm in size has high elasticity. The most effective composition of a bitumen-regenerated composite material based on tire reclaim has been determined. In terms of the totality of physicochemical and operational characteristics and comparative cost, the most acceptable is the bitumen-regenerated composition (with a regenerate content of 20%) and is superior in the complex of properties to bitumen modified with an optimal content of ethylene with butyl acrylate and glycidyl methacrylate (1.6%). The technology for modifying bitumen with tire reclaim is less time-consuming, more economically profitable, and environmentally effective, since it utilizes large-tonnage waste of worn-out tires. The resulting bitumen-polymer compositions have a high positive set of properties: softening point, hardness, elasticity, frost resistance, and low-temperature characteristics.

CHEMICAL MODIFICATION OF ROAD PETROLEUM BITUMEN WITH MALEIC ANHYDRIDE AND POLYETHYLENE GLYCOLS

A number of problems arise in the production and application of road bitumen. One of them is unsatisfactory operational characteristics, mainly heat resistance, elasticity and adhesion between the binder and aggregate. With an increase in the intensity of traffic, an increase in the volume of heavy goods transportation, the mass of cars, together with the influence of weather and climate factors on the structure, this leads to the destruction of the road surface. The work describes the results of the study of the process of chemical modification of road petroleum bitumen with maleic anhydride and polyethylene glycols (PEG) to obtain bitumen-polymer mixtures, which, in addition to good heat resistance, also have high elasticity. When modifying road bitumen with maleic anhydride, the latter acts as a certain narrowing link, which contains on the one hand a double bond that interacts with bitumen, and on the other hand an anhydride group that can interact with various polymers containing functional groups (hydroxyl, epoxy and other). Further, by adding a polymer to maleinized bitumen (bitumen modified with maleic anhydride), the resulting bitumen-polymer mixtures can be given various properties (heat resistance, elasticity, adhesion, and others). Polyethylene glycol is a cheap polymer capable of interacting with the anhydride group of maleic anhydride in bitumen on the hydroxyl group. It was established that the effect of maleic anhydride and maleic anhydride together with PEG on the heat-resistant characteristics of bitumen is the same regardless of the modification conditions. Compared to the original bitumen, the obtained BPS is characterized by a higher softening temperature, lower penetration and ductility. The temperature of brittleness is not rapid, but it is increasing. The influence of the used modifiers on bitumen elasticity is significant and depends on the modification conditions. It was established that PEG 2000 is the optimal PEG for modifying maleinized bitumen, from the point of view of ensuring good bitumen elasticity.

ASPHALT MIXTURES AND ASPHALT CONCRETE USING OIL RESIDUES AND BITUMEN MODIFIED WITH MALEIC ANHYDRIDE AND POLYETHYLENE GLYCOLS

A number of problems arise during the production and use of petroleum road bitumen. One of them is unsatisfactory performance characteristics, mainly heat resistance, plasticity, elasticity, and adhesion between the binder and the surface of the mineral material. With the increase in traffic intensity, the growth of heavy traffic volumes, the weight of cars, along with the impact of weather and climatic factors on the structure, this leads to the destruction of the road surface. One of the most promising areas in improving the quality of binders to obtain pavements with improved performance characteristics is their modification with polymeric materials. However, the use of modifiers is limited due to their high cost. Therefore, it is important to find inexpensive substances that would improve the performance characteristics of bitumen. This work is devoted to a completely new binder for asphalt mixtures, including crushed stone mastic mixtures. As a binder, we used raw materials for the production of bitumen - tar, modified with maleic anhydride and polyethylene glycol. The design of crushed stone and mastic asphalt mixtures using the obtained binders was carried out, and samples of crushed stone and mastic asphalt concrete were formed from them and tested. It was found that when binders were obtained from tar by modifying it with maleic anhydride and polyethylene glycol, crushed stone mastic mixtures with lower strength values were obtained compared to binders obtained by modifying oxidized bitumen. Comparison of crushed stone and mastic mixtures obtained using SBS modified bitumen and the studied binders showed that the use of the studied binders (oxidized bitumen modified with maleic anhydride and maleinized oxidized bitumen modified with polyethylene glycol) is characterized by lower water saturation and strength compared to the use of oxidized bitumen modified with SBS.

Interfacial Interaction and Fatigue Behavior of Asphalt Mastics

Rheological characteristics of five road bitumens with different group composition and penetration at 25оС from 60 to 115х0.1 mm and asphalt binders based on them with volume content of filler (mineral powder of MP1 grade) – 0.275 (mass ratio bitumen: filler – 1:1) have been determined in the range from 30 to -10оС on dynamic shear rheometer. The influence of temperature and frequency on the parameter of interfacial interaction K-B-G* and thickness of adsorbed layer of original and thermal oxidative aging samples of asphalt mastic has been investigated. It is shown that in all samples K-B-G* decreases with decreasing temperature and increasing test frequency. A decrease in K-B-G* and adsorbed layer thickness in mastics after aging was observed in the case of bitumen with Gestel colloidal index CI=0.46–0.53, defined as CI=(S+A)(/R+Ar), and was stability of K-B-G* and adsorbed layer thickness in the case of bitumen with CI=0.61. No relationship was found between group chemical composition of bitumen and adsorbed layer thickness in original mastics. In aged mastic the greater thickness of adsorbed layer has samples based on bitumen with higher content of asphaltenes. The peculiarities of fatigue behavior of bitumen and mastic in the linear amplitude sweep test were investigated. The correlation between the thickness of the adsorbed layer and the angle of slope of the curves of dependence of the maximum shear stress (τmax) on the complex modulus (G*) was noted for aged samples.

Effect of Bisphenol-Formaldehyde Resin on Physico-Mechanical Properties of Road Bitumen

A bisphenol-formaldehyde resin was synthesized using the polycondensation method of bisphenol A with formaldehyde. Road bitumen has been modified with this resin. The possibility of its use as a road petroleum bitumen modifier has been established for different contents of the synthesized resin. It has been established that the introduction of synthesized bisphenol-formaldehyde resin into the composition of bitumen significantly increases its heat resistance. The synthesized resin and modified bitumens were characterized using IR spectroscopy. The change in the composition and properties of the bitumen modified with bisphenol-formaldehyde resin has been described.

Use of Lignite Processing Products as Additives to Road Petroleum Bitumen

It is known that there are significant deposits of lignite (brown coal) in Ukraine, particularly in categories A + B + C1. At the same time, certain technical and legal obstacles limit its use as an energy carrier. Therefore, new methods of using lignite and processing its products are necessary. The latter includes humic acids. It was suggested that these acids could be used to stop road bitumens from breaking down. This is because they are antioxidants that contain functional phenolic and carboxyl groups. In particular, this article analyses the nature of the influence of humic acids on the physical and mechanical properties of road petroleum bitumen and its resistance to technological aging. It was found that at a modification temperature of 120 °C (duration-60 min., consumption of humic acids-2.0 wt.%), this additive has a slight negative effect (changes are within permissible limits) on the plastic properties of bitumen and slightly improves its elasticity. The main reason for adding humic acids to road bitumen under the specified conditions is to improve its resistance to technological aging compared to the original binder.

Influence of group chemical composition of highly viscous oil residues on quality of petroleum road bitumens

The Kalamkas deposit’s oil and its distillation products were studied, and research results on residues and road grade bitumen compositions obtained by oxidation of heavy oil residuest are presented. The atmospheric residue of Kalamkas oil (350 Со) was subjected to vacuum distillation with the selection of gas oil fractions boiling to 380, 400 and 420 Со. Samples of residues were subjected to oxidation in a laboratory installation, which is a batch cube at constant operating conditions. The residues from different depths of gas oil fractions are characterized by different group chemical compositions. The group composition of the residues changes, the content of paraffinnaphthenic hydrocarbons decreases from 29.4 to 23.3% wt. and the proportion of heavy aromatic hydrocarbons increases from 26.8 to 27.8% wt. The content of asphaltenes (from 7.7 to 12.4% wt) and resins (from 17.4 to 22.5% wt) also increases. The ratio of asphaltenes and resins increases from 0.44 to 0.55. With an increase in the depth of selection of gas oil fractions to 420°C, the degree of aromaticity, the ratio of the amount of aromatic hydrocarbons to paraffin-naphthenic ones, increases to 1.79. Road grade bitumens produced from the vacuum distillation residues of Kalamkas oil fuel oil using direct oxidation technology of raw materials have the best performance characteristics if they are obtained from residues boiling in the range of 380–400°C. Residues boiling above 380-400 Со can serve as raw materials for the production of oxidized road bitumen of BND70/100 grade according to ST RK 1373 - 2013.

Випробування кумарон-інден-карбазольної смоли та модифікованих нею бітумів

DOI: 10.31081/1681-309X-2024-0-1-26-33 Specialty 161. U.D.C. 665.775.4 TESTING OF COUMARONE-INDENE-CARBAZOLE RESIN AND BITUMEN MODIFIED BY IT © Yu.V. Prysiazhnyi, PhD in Technical Sciences, S.V. Pyshyev, Doctor of Technical Sciences (Lviv Polytechnic National University, 12, S. Bandera Str., Lviv, 79013, Ukraine) The article shows the importance of research aimed at obtaining road bitumen modifiers from nontarget products of coal thermal processing, in particular, by further processing of high-boiling fractions that are separated from liquid coal coking products. The results obtained in this area indicate the effectiveness of using modified coumarone-indene-carbazole resins as a polymeric modifier of road oil bitumen. Laboratory tests were carried out. As starting materials, we used bitumen of BND 70/100 grade, obtained at PJSC “Ukrtatnafta”, and coumarone-indene-carbazole resin synthesized by ionic cooligomerization from a narrow coumarone-indene fraction (140-190 °C) and carbazole. The modification of road bitumen with coumarone-indene-carbazole resin was carried out to determine the quality characteristics of the resulting modified binder. By changing the mass content of coumarone-indene-carbazole resin in bitumen, several series of modification were performed. The resin consumption was set based on the consumption of industrial adhesives – 0.1 to 2.0 % by weight. The conditions for mixing the modifier with bitumen were as follows: temperature – 190 °C; duration – 60 minutes; modified Reynolds criterion – 109500. Using the modified bitumen, an asphalt mix was prepared, the corresponding asphalt concrete was produced and its quality was analysed. It was found that modification of BND 70/100 road bitumen with coumarone-indene-carbazole resin significantly improves its adhesion, while slightly deteriorating its thermoplastic properties. Coumarone-indene-carbazole resin ultimately improves the physical and mechanical properties of ASG.Dr.Sh.A.NP.I. asphalt concrete, in particular, the water saturation and compressive strength at 20 °C. Keywords: oil processing, coal processing, bitumen, modification, coumarone, indene, carbazole, resin. Corresponding author: Yu.V. Prysyazhnyi, e-mail: yurii.v.prysiazhnyi@lpnu.ua

INCREASING THE DURABILITY OF PAVEMENT ON REINFORCED CONCRETE ROAD BRIDGES

Summary. Highway bridges are an important part of the transportation infrastructure, as they ensure the uninterrupted movement of vehicles and cargo. Due to the peculiarities of asphalt pavement operation on bridges with reinforced concrete roadway slabs, as well as the negative impact of weather conditions and the use of deicing materials, such pavement is more often subject to defects. In order to minimize pavement damage on road bridges and increase their durability, it is necessary to improve certain aspects of conventional asphalt mixtures, such as rutting and cracking resistance. Today, one of the methods to ensure increased durability of asphalt pavements is to modify asphalt mixtures or bituminous binders. The use of asphalt concrete pavements with increased durability is an effective method to increase the overhaul period and, as a result, reduce the cost of maintenance of road bridges. And the use of asphalt mixtures modified with rubber crumb will provide a partial solution to the environmental problem, such as the accumulation of waste from the rubber industry. Keywords: road bitumen, bitumen binder modification, asphalt concrete, asphalt mixtures.

Identification of technological parameters process of petroleum road bitumen by mathematical modeling

Identification of technological parameters process of petroleum road bitumen by mathematical modeling