Wyniki wyszukiwania - BazTech

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Study of the possibility of using sulfur asphalt and sulfur concrete in road construction

Bieliatynskyi Andrii, Yang Shilin, Krayushkina Kateryna, Shao Meiyu, Ta Mingyang

Materials Science Poland

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2023

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Vol. 41, No. 2

244--262

EN

The introduction of new effective road construction materials for pavements and foundations of highways is an urgent task, including the development and application of resource-saving technologies aimed at the use of low-demand, large-tonnage mineral materials, semi-finished products, industrial waste, and their by-products. Research on this topic has shown that sulfur and sulfur-containing waste, as well as modified technical sulfur when used as a binder, should be widely used in sulfur structural and road concrete in liquid, granular, or lumpy form. Ferrous cakes from the Pobug Nickel Plant or "tailings" of sulfur ore flotation can be used as fillers for sulfur binder. Having a high specific surface, they will have a positive effect on the structure formation of sulfur during the crystallization of the melt in the direction of strengthening the structure. Their high acid resistance should significantly increase the corrosion resistance of sulfur concretes. Granular slag from a metallurgical plant can be used as a fine aggregate. Overburden rocks in the form of gabbro-dolerites, dolerites, and basalts can be used as acid-resistant large aggregates. To reduce the fragility of the sulfur binder, plasticizing additives such as naphthalene, chlorinated paraffin, and bitumen can be introduced. The results obtained in this study confirm a decrease in the cost in the production of asphalt and cement concrete and the possibility of expanding the range of building materials with new road-building mixtures. Also, the test results showed that when temperature was decreased, the strength characteristics of sulfur concrete in the temperature range 0°C to −60°C increased by 7%. Low water absorption of sulfur concrete (0.1%–0.3%) versus cement concrete (2%–4%), which positively affected the strength and operational characteristics, was revealed.

2

Determination of the possibility of using phosphorus slag in the road industry

Yang Shilin, Krayushkina Kateryna, Akmaldinova Oleksandra, Ji Junwen, Bieliatynskyi Andrii

Materials Science Poland

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2023

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Vol. 41, No. 3

44--61

EN

The use of crushed, granulated slag is now a rational direction in the use of phosphorus waste in various areas of construction. The modern state of science and technology and the accumulated experience allow to use almost all types of metallurgical slag for the production of road-building materials. The use of slag from other industries will expand the raw material base and improve its geographical location, increase material production and quality, reduce the distance of material transportation and reduce the road construction cost. The use of slag is an environmental task that will have a social impact. The study theoretically proved and experimentally established the feasibility of laying asphalt concrete coatings with phosphorus slag on roadways. The technology of asphalt–concrete mixture preparations and compaction is developed, which ensures high operational properties of road surfaces. It was established that it is possible to produce homogeneous asphalt concrete with phosphorus slag, gravel, mineral powder, and sand, unlike traditional mineral materials of natural origin, such as limestone.

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Improvement of the method for increasing roughness of asphalt and cement‑concrete surfaces of highways and airfields

Yang Shilin, Krayushkina Kateryna, Skrypchenko Oleksandra, Ji Junwen, Bieliatynskyi Andrii

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 2

art. no. e121, 2023

EN

The safety of vehicles is ensured by a sufficient adhesion of the vehicle wheel to the asphalt concrete pavement, which is assessed by the adhesion coefficient. However, it is not possible to identify the reasons for the reduced adhesive properties of asphalt concrete pavement during operation by the adhesion coefficient. This can be explained by the fact that such properties are attributed to the roughness of the surface. The existing methods for increasing the adhesive properties and roughness of asphalt concrete pavement are based on the use of mixtures of stone materials with bitumen or the construction of a layer of stone mastic asphalt (SMA). Nevertheless, they do not always ensure the standard adhesion coefficient after the first year of maintenance. Thus, there is a need for the improvement of the method for increasing the roughness of the existing asphalt concrete pavement. During the research, compressive and tensile strength were evaluated. The British pendulum has been used to investigate the roughness of the cement concretes surface. As a result, it was established that the introduction of the basalt fiber into the cement mixture improves its physical and mechanical characteristics. Finally, the composition of the cement mixture for the rough thin-layer cement pavement was developed, taking into account the existing parameters of the asphalt pavements.

4

Technology for improving modern polymer composite materials

Yang Shilin, Bieliatynskyi Andrii, Trachevskyi Viacheslav, Shao Meiyu, Ta Mingyang

Materials Science Poland

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2022

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Vol. 40, No. 3

27--41

EN

The purpose of the work was to determine the properties of the developed material (bitumen). In this study, the technological process was improved by modifying low-molecular weight butadiene and chloroprene rubbers structured with carbon nanotubes (CNTs) to obtain a material with the necessary set of desired properties. The article shows the possibility of modifying the bituminous binder of asphalt concrete with elastomeric rubbers structured with CNTs. The article also considers the use of promising polymer composite materials and the increase in their reliability and service life. Improvements in the properties of the composite and in the technology due to direct reinforcement with nanomaterials are described. The article defines the areas of application and recommended improvement of composite materials, as well as existing limitations.

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Investigation of the properties of cast asphalt concrete mixture with the addition of fiber from the fly ash of thermal power plants

Bieliatynskyi Andrii, Yang Shilin, Pershakov Valerii, Shao Meiyu, Ta Mingyang

Materials Science Poland

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2022

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Vol. 40, No. 4

125--146

EN

The introduction of new road-building materials with advanced physical and mechanical properties is the trend in contemporary civil engineering, which aims to increase the quality of road surfaces. The use of cast asphalt concrete in the upper layers of road surfaces as a replacement for layers made of traditional fine-grained asphalt concrete will not only increase the pace of construction and repair, but also the durability and quality of the road pavement. However, this method requires operational and economic optimization. Using fiber from the fly ash of thermal power plants is one of the solutions for the design of cast asphalt concrete compositions. The aim of the work is to design the optimal composition of hot cast asphalt concrete and cold cast emulsion–mineral mixtures with the use of fiber from the fly ash of thermal power plants for the construction of thin-layer coatings of highways of all categories and values; to study their properties; and to determine the feasibility of their use as reinforcing and stabilizing additives. The method of GOST 11506, namely, "Method for determining the softening temperature of the ring and ball", with the apparatus "Lintel KiSh-20m-4" was used during the experiments. The use of standard laboratory tests made it possible to analyze the quality indicators of the materials under study and design the optimal compositions of hot cast asphalt concrete, taking into account the delamination of the mixture and the criterion of decomposition, in addition to exploring the properties of the obtained material.

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Features of the hot recycling method used to repair asphalt concrete pavements

Bieliatynskyi Andrii, Yang Shilin, Pershakov Valerii, Shao Meiyu, Ta Mingyang

Materials Science Poland

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2022

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Vol. 40, No. 2

181--195

EN

The recycling methods used in the construction and repairing of asphalt concrete pavements are being constantly improved, and the improvements mostly fall under one of the following common avenues of innovation: developing new binders based on bitumen and cement; developing new varieties of asphalt concrete and other materials having an equivalent utility and function; and developing additives that can be used in the production of new types of binders that can enhance the performance properties of the pavements. This article aims to develop the composition and determine the physical-mechanical and structural-rheological properties of asphalt concrete reclaimed by the hot recycling method and reinforced by fiber of fly ash from thermal power plants (TPP). The author of this article developed a mechanism for the interaction between fiber and bitumen in asphalt binder and acquired an optimum composition of hot granular asphalt concrete. During the research, the author evaluated the utility of fiber used as an additive in reclaimed asphalt concrete, studied its effect on the properties of hot reclaimed asphalt concrete, and examined the technological and performance properties and durability of the material obtained. The fiber of fly ash used in the hot recycling method made it possible to reduce the cost and ensure the high quality and durability of the structural layer of road pavement. Our experiments with analyses of the obtained composition indicated that employing it in the construction of the structural layer of road payment would result in superior structural integrity. Hot recycling made it possible to obtain thick bound layers characterized by the homogeneity of the material. For the first time, the author studied the effect of using fiber of fly ash from Chinese TPP in hot reclaimed asphalt concrete, and the results have proved the rationality of using this composition.

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Development of building materials based on a high content of fly ash and polycondensation products from Chinese heat and power plants

Bieliatynskyi Andrii, Yang Shilin, Pershakov Valerii, Shao Meiyu, Ta Mingyang

Materials Science Poland

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2022

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Vol. 40, No. 2

270--288

EN

The addition of fly ash from thermal power plants (TPP) and chemical additives, such as polycondensation products of acetone and formaldehyde, is an effective and economical method for increasing the strength and durability of building materials, in particular concrete. Fly ash added to the concrete and mortars at 10%–15% does not reduce their technical properties, while polycondensation products of acetone and formaldehyde plasticize and accelerate the hardening process of concrete. The study aims to substantiate the possibility of obtaining concrete on dense aggregates with a high content of fly ash through the use of polycondensation products of acetone and formaldehyde as additives, which are highly soluble in water and polyfunctional. The strength indicators were determined using standard methods. The study has shown quantitative changes in the properties of the fly ash-concrete mixture, improvement of its physical and technical characteristics, and durability of the fly ash concrete with the addition of polycondensation products of acetone and formaldehyde. In the present study, the authors determine the effect of fly ash addition on the properties of a concrete mixture, as well as the maximum possible content of fly ash that can be added to concrete to maximize certain properties required of the mixture; additionally, the same action is conducted with the addition of polycondensation products of acetone and formaldehyde concomitant with the addition of fly ash.