A literature review of the five main theories describing the interaction mechanisms in the bitumen/aggregate system was conducted: theory of weak boundary layers, mechanical theory, electrostatic theory, chemical bonding theory, and thermodynamic theory (adsorption theory). The adhesion assessment methods in the bitumen/aggregate system are described, which can be divided into three main groups: determination of adhesion forces for bitumen with different materials, determination of bitumen resistance to the exfoliating action of water with different materials, and determination of adhesion as a fundamental value (contact angle measurements, interfacial fracture energy, adsorption capacity and others). It is proposed to evaluate the quality of adhesive interaction in the bitumen/aggregate system in two stages. The authors recommend using the adhesion determination methods for these two stages from the second group of methods the determination of bitumen resistance to the exfoliating action of water with different materials. In the first stage, the adhesion in the bitumen/aggregate system is determined by an accelerated technique in which the used bitumen binder and mineral material are considered as test materials. After the first stage, there are positive results in the second tests on compacted mixtures (indirect tensile strength test, Modified Lottman indirect tension test, immersion-compression test, and Hamburg wheel tracking test).

Nowadays, the most common ways to dispose of acid tars and paper production waste are burial or incineration, but it is ecologically and economically expedient to use such waste in building materials. A new variant of filler aggregate—wastepaper sludge ash (paper production waste) and a chemical activator for filler aggregates—acid tar (oil-refining industry waste) is proposed. Elemental and mineralogical compositions of wastepaper sludge ash for comparison with commodity limestone mineral powder are established. Chemical activation of wastepaper sludge ash and limestone mineral powder was carried out and the wetting properties of the obtained materials were investigated by means of primary and neutralized acid tar. The physical and mechanical properties of stone mastic asphalt samples with different filler aggregate variants were studied. The possible chemical transformations in stone mastic asphalt using limestone mineral powder and wastepaper sludge ash activated by acid tar are shown. The possibility of replacing traditional limestone mineral powder with industrial wastepaper sludge ash has been proven, and the effectiveness of activating filler aggregates by acid tar has been confirmed. It was established that acid tar as an activator for filler aggregates does not require neutralization because stone mastic asphalt, in this case, demonstrates better properties compared to acid tar neutralization. As a result of our research, the application of wastepaper sludge ash is possible as a filler aggregate for stone mastic asphalt. And to obtain improved stone mastic asphalt characteristics, wastepaper sludge ash is required to activate 5 wt.% acid tar.

The noncatalytic oxidative desulfurization process of straight-run kerosene and diesel fractions with high sulfur contents due to their treatment with air without using expensive catalysts and strong oxidants is considered. The research was carried out in a periodic mode in a bubble-type reactor with a volume of 1 x 10(-3) m(3) under the following conditions: 180-200 degrees C; 2.5-3.0 MPa; the process lasted for 20-30 min; the air/raw material ratio was 1.6-2.2 m(3)/min per 1 m(3) of raw material. The process can be used to obtain industrial jet fuels and diesel fuel components with good lubricating properties. The possibility and expediency of carrying out the process in the presence of water have been studied. The ratio of water/ raw materials (vol.) varied from 0:1 to 2:1. It was proven that the water presence in the reaction medium has a positive effect on the studied process and decreases the oxidation intensity of hydrocarbon medium by 2-4 times. This is due to both the slowing of oxidation reactions by water during peroxide decomposition and chain growth and branching and the partial change in chemical oxidation with the formation of phenols and/or tertiary alcohols, which are inhibitors of oxidation reactions. On the other hand, water has almost no effect on the removal degree of sulfur compounds.

Herein, a method for the coke dry quenching (CDQ) process has been proposed and its optimization has been carried out, which will minimize the disadvantages of this process. This optimization was carried out to develop a technology for uniform coke distribution in the quenching chamber. A model of the real charging device for quenching coke from the Ukrainian enterprise PrJSC "Avdiivka Coke" was developed, and several shortcomings of its operation were shown. It is proposed to use a coke distributor in the form of a bell and a modified bell (specially shaped holes). Graphic mathematical models of the operation of these two devices were developed, and the efficiency of the last of the developed distributors was shown.

The expediency of involving large‐tonnage sulfur production waste from Rozdil Mining and Chemical Enterprise Sirka (Ukraine) in road surface production has been substantiated theoretically and practically. In particular, the possibility of using waste from sulfur ores flotation enrichment and sulfur filtration purification from ash and organic impurities and their mixtures in the production of modified hot mix asphalt were investigated. It was found that sulfur content changes in bitumen can influence its operational properties: at sulfur concentrations of 5 wt. %, it acts as a plasticizer and at sulfur content ≥ 20 wt. %, it behaves as a filler. There are reasons to state that it is most effective to introduce sulfur into asphalt concrete (AC) as filler aggregate directly in the preparation process of sulfur asphalt mixes in an asphalt mixer. It is shown that the strength of sulfur AC grows over time and reaches maximum values within 15 days. It has been established experimentally that the use of highly sulfur‐concentrated filler aggregates instead of traditional limestone minerals significantly improves the main operational characteristics of AC, in particular: strength at a temperature of 20°C and at a temperature of 50°C; heat resistance; bitumen content to achieve regulated residual porosity is reduced. It was demonstrated that increasing the sulfur content in filler aggregate makes it possible to reduce the bitumen content in AC. Pilot construction of road pavements was conducted, which confirmed that sulfur AC has better operational characteristics compared with regular AC.