Study of Physical-Mechanical Properties of Asphalt-Concrete Specimens on Activated Mineral Powders of Various Compositions

Trautvain, Anna; Yadykina, Valentina; Mulenko, E.

doi:10.34031/2618-7183-2018-1-4-44-50

Cited by 5 publications

(7 citation statements)

References 2 publications

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“…However, even in them, the wetting conditions are characterized only by the contact angle [31]. In most other studies, the hydrophobicity of powders was assessed visually [21,[32][33][34]. But in recent years, studies have appeared in which modern methods and the assessment criteria of the mineral powders' hydrophobicity degree have been proposed [20,35,36].…”

Section: Of 14mentioning

confidence: 99%

“…According to Russian and foreign sources, the hydrophobicity of the dispersed materials is assessed by the contact angle [22,31,48,49], visually by the presence or absence of sediment in the water layer or wetting traces after the mechanical effect [21,[32][33][34]50]. However, nowadays, tools for the hydrophobicity degree to quantitatively characterize The results obtained show that hydrophobizing treatment of limestone-based fillers does not lead to significant changes in the particle size distribution and surface morphology of the particles.…”

Section: Mineral Powders Hydrophobicity Assessmentmentioning

confidence: 99%

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Hydrophilic–Hydrophobic Properties of the Surface of Modified Carbonate Fillers for Asphalt

Lebedev,

Yadykina,

Akimov

et al. 2023

J. Compos. Sci.

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The physicochemical modification of the filler allows changing the hydrophilic–hydrophobic properties and effectively influencing the processes occurring at the filler–binder interface, on which the physicomechanical characteristics of composites largely depend. The paper presents studies related to the modification of limestone-based filler effect on the degree of its hydrophobicity and wetting with liquids of different polarity, establishing the relationship between the characteristics of hydrophobized mineral powders and the adsorption capacity in relation to water. Using mechanochemical processing with hydrophobic components GF-1 and GF-2, it was possible to obtain fillers with a sufficiently high content of hydrophobic particles (58.2% and 85.9%, respectively). It was found that the results of the contact angle (123.6° and 114.5°, respectively) and the degree of hydrophobicity do not quite correlate with each other. It was noticed that the contact angle on the powder modified with GF-1 decreases with time. Studies of the powders’ thermal effects wetting of different polarity liquids via microcalorimetry allows us to establish that with an increase in the filler hydrophobicity degree, the integral heat of immersion decreases due to a significant decrease in the probability of chemical interactions between water and powder due to the adsorption of applied surfactants molecules on the limestone active centers. The revealed endothermic effects indicate the occurrence of physical interactions due to non-polar dispersion forces. Differences in the nature of heat release and heat absorption in modified fillers indicate significant differences in the composition and mechanism of action of the used surfactants, which affected the efficiency of hydrophobization. At the same time, a linear dependence of the moisture absorption and moisture indicators, determined by independent experiments, on the degree of hydrophobicity was established.

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Section: Of 14mentioning

confidence: 99%

Section: Mineral Powders Hydrophobicity Assessmentmentioning

confidence: 99%

Hydrophilic–Hydrophobic Properties of the Surface of Modified Carbonate Fillers for Asphalt

Lebedev,

Yadykina,

Akimov

et al. 2023

J. Compos. Sci.

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“…Based on the results of previous studies [8][9][10][11], 4 formulations of stabilizing additives were developed, including organic binder and structurant, and bitumen emulsion was used as an organic binder, pulp and paper wastes were used as an organic binder and limestone or waste wet magnetic separation (WMS) of ferruginous quartzites.…”

Section: Experimental Partmentioning

confidence: 99%

“…The same powder may be in different states. This affects the packing density of particles and the nature of the bonds between them [12][13]. The nature of the influence of the properties of powders on the process must be assessed by their rheological and strength properties.…”

Section: Experimental Partmentioning

confidence: 99%

Study of the Influence of Thin-Dispersed Powders on the Structuring Ability of Stabilizing Additives

Trautvain

Yadykina

Tobolenko

2019

MSF

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The article presents the results of the study of the bitumen-retaining ability of stabilizing additives developed on the basis of cellulose-paper waste and finely dispersed fillers of various genesis. Analysis of the test results of crushed stone-mastic asphalt mixtures of the same composition showed that all additives provide the value of the runoff index of the organic binder in the mixture, which meets the requirement of the State Educational Standard No. 31015-2002. The introduction of mineral fillers into the stabilizer contributes to a decrease in the studied parameter, which is due to the additional structuring effect. For a two-component additive (without mineral filler), the studied indicator has the greatest value, exceeding the recommended limit. It is important to note that the use of mineral powder in the composition of stabilizing additives has a positive effect on the flow of the binder. Mineral powder, due to the structuring effect on bitumen and the formation of a microporous structure, reduces the run-off rate of the binder. This is due to the fact that bitumen, being in thin interlayers and small pores, falls into the region of influence of the molecules of the surface layer of the mineral part, increasing the density of granules and facilitating the granulation process of the additive. The minimum runoff of the organic binder is observed in the preparation of crushed stone-mastic asphalt-concrete mix with additives based on mechanically activated wastes of wet magnetic separation of ferruginous quartzites and is 0.07.

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“…Studies on diffusion characteristics are mainly divided into macro experiment and microanalysis. Macroscopically, the dynamic shear rheological (DSR) experiment can be used to analyze the significant effects of time, temperature, asphalt variety, and rejuvenator on composite shear modulus by means of variance analysis, so as to compare their effects on diffusion [31][32][33][34]. On the micro level, infrared spectrum analysis, gel chromatography, thin layer chromatography, Fourier infrared spectroscopy and other advanced means are adopted to study asphalt mixture, and molecular simulation technology is used to simulate the diffusion behavior of old and new asphalt [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Interface Fusion Effect between Old and New Asphalt under Plant Mixing and Cold Recycling Mode Based on Molecular Dynamics Simulation

Zhou

Wang

2021

Materials

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Road construction consumes a lot of resources and produces a lot of waste and other pollutants. With the emergence of a resource and energy crisis, how to make efficient use of rap has become the research focus of scientific researchers. The interface fusion effect of old and new asphalt in plant mixing and cooling recycling mode is analyzed in order to improve the utilization rate of old asphalt in reclaimed asphalt pavement. In this paper, Materials Studio software was used to establish a bitumen model using the method of four components of bitumen, and then the rationality of the model was verified by density, solubility number and atomic radial distribution function, and the diffusion coefficient obtained from the mean square displacement (MSD) was taken as its evaluation index. The results showed that the diffusion model tends to be stable after 20 ps, and the degree of diffusion increases with the increase in temperature. The degree of diffusion of new asphalt to old asphalt and the degree of diffusion of old asphalt to new asphalt are basically very similar; however, there are some differences at different temperatures. Only a small part of the surface contact between old and new asphalt has been fused, which accords with the partial fusion theory. Compared with Panjin 90# asphalt, the diffusion coefficient of Zhonghaiyou asphalt increases faster with the increase in temperature. The diffusion coefficient increases by 64.3% with the increase of the content of rejuvenators after adding different rejuvenators into the new asphalt. Clarifying the interface fusion effect will be helpful to guide the optimization design of cold-mixing recycled asphalt mixture more scientifically and reasonably. Future research should focus on increasing the fusion effect of old and new asphalt, and explore its influence on the conventional road performance of asphalt mixture.

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Study of Physical-Mechanical Properties of Asphalt-Concrete Specimens on Activated Mineral Powders of Various Compositions

Cited by 5 publications

References 2 publications

Hydrophilic–Hydrophobic Properties of the Surface of Modified Carbonate Fillers for Asphalt

Hydrophilic–Hydrophobic Properties of the Surface of Modified Carbonate Fillers for Asphalt

Study of the Influence of Thin-Dispersed Powders on the Structuring Ability of Stabilizing Additives

Analysis of Interface Fusion Effect between Old and New Asphalt under Plant Mixing and Cold Recycling Mode Based on Molecular Dynamics Simulation

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