Structural forming of soil composites using as a pavement subgrade strengthening
The article substantiates the possibility of obtaining composite materials with improved functional properties to strengthen the subgrade, containing technogenic soil stabilized by an additive based on a gelling polymer. The introduction of technogenic soils into composites will not only reduce the...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509523010288 |
| _version_ | 1797364214236446720 |
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| author | Pavel Pankov Dmitry Bespolitov Nikolay Shavanov Nataliya Konovalova Maria Ushkova Aleksandr Karabtsov Irina Tarasenko Valery Petukhov Igor Panarin Mikhail Zayakhanov Aleksandr Bituev |
| author_facet | Pavel Pankov Dmitry Bespolitov Nikolay Shavanov Nataliya Konovalova Maria Ushkova Aleksandr Karabtsov Irina Tarasenko Valery Petukhov Igor Panarin Mikhail Zayakhanov Aleksandr Bituev |
| author_sort | Pavel Pankov |
| collection | DOAJ |
| description | The article substantiates the possibility of obtaining composite materials with improved functional properties to strengthen the subgrade, containing technogenic soil stabilized by an additive based on a gelling polymer. The introduction of technogenic soils into composites will not only reduce the consumption of expensive materials, but also solve a complex of acute environmental problems. Composite materials can be used in the construction of structural layers of road pavements, foundations of buildings and structures, sites for various purposes, for the prevention and elimination of defects in the foundations of engineering structures during their construction, reconstruction and repair, including in permafrost areas. Stabilized technogenic soils are more durable, frost-resistant and waterproof, which makes them applicable for creating impervious curtains in hydraulic structures and sealing storage facilities for hazardous substances. The cryogenic effect on a composite material allows one to vary its properties within a wide range and modify its macroporous structure. Studying the process of structure formation of the resulting organic-inorganic materials, consisting of macromolecules of high-molecular substances and inorganic inclusions that have undergone cryogenic treatment, will make it possible to specifically regulate their performance characteristics. The best values of strength characteristics were obtained for samples with a stabilizing additive concentration of 100 g/l. The resulting composite materials are hydrophobic, frost-resistant, characterized by a compressive strength of 2.3–6.5 MPa and a thermal conductivity of 0.19–0.20 W/(m·K). Data from differential scanning calorimetry and thermogravimetry and IR spectroscopy revealed that the binding of mineral particles by a stabilizing additive occurs due to the formation of organomineral complexes with the participation of clay minerals and the restructuring of hydration shells. SEM data indicate that crystallinity zones formed due to hydrogen bonds of hydroxyl groups of neighboring polymer chains can participate in the formation of the composite structure. An increase in the number of cryogenic treatment cycles promotes additional structuring and strengthening of the polymer phase due to the formation of additional nodes of the supramolecular network, ordering of crystallinity zones and the appearance of compacted areas in the structure. Computed X-ray tomography revealed an increase in the density of the composite upon drying, which helps to increase its strength characteristics. The structure of the sample is characterized by heterogeneity of the pore space, which is characterized by the presence of both fine-porous and large-porous regions, which determines its thermophysical properties. |
| first_indexed | 2024-03-08T16:32:04Z |
| format | Article |
| id | doaj.art-36e464a653434d21b66d9d3e3ce9ef34 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-08T16:32:04Z |
| publishDate | 2024-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-36e464a653434d21b66d9d3e3ce9ef342024-01-06T04:38:55ZengElsevierCase Studies in Construction Materials2214-50952024-07-0120e02847Structural forming of soil composites using as a pavement subgrade strengtheningPavel Pankov0Dmitry Bespolitov1Nikolay Shavanov2Nataliya Konovalova3Maria Ushkova4Aleksandr Karabtsov5Irina Tarasenko6Valery Petukhov7Igor Panarin8Mikhail Zayakhanov9Aleksandr Bituev10Irkutsk State Transport University, Irkutsk 664074, RussiaIrkutsk State Transport University, Irkutsk 664074, RussiaIrkutsk State Transport University, Irkutsk 664074, RussiaIrkutsk State Transport University, Irkutsk 664074, RussiaRussian Academy of Sciences, Far Eastern Branch, Far East Geological Institute (FEGI FEB RAS), Vladivostok 690022, RussiaRussian Academy of Sciences, Far Eastern Branch, Far East Geological Institute (FEGI FEB RAS), Vladivostok 690022, RussiaRussian Academy of Sciences, Far Eastern Branch, Far East Geological Institute (FEGI FEB RAS), Vladivostok 690022, RussiaFar Eastern University, Vladivostok 690922, RussiaFar Eastern University, Vladivostok 690922, Russia; Corresponding author.East Siberia State University of Technology and Management, Ulan-Ude 308012, RussiaEast Siberia State University of Technology and Management, Ulan-Ude 308012, RussiaThe article substantiates the possibility of obtaining composite materials with improved functional properties to strengthen the subgrade, containing technogenic soil stabilized by an additive based on a gelling polymer. The introduction of technogenic soils into composites will not only reduce the consumption of expensive materials, but also solve a complex of acute environmental problems. Composite materials can be used in the construction of structural layers of road pavements, foundations of buildings and structures, sites for various purposes, for the prevention and elimination of defects in the foundations of engineering structures during their construction, reconstruction and repair, including in permafrost areas. Stabilized technogenic soils are more durable, frost-resistant and waterproof, which makes them applicable for creating impervious curtains in hydraulic structures and sealing storage facilities for hazardous substances. The cryogenic effect on a composite material allows one to vary its properties within a wide range and modify its macroporous structure. Studying the process of structure formation of the resulting organic-inorganic materials, consisting of macromolecules of high-molecular substances and inorganic inclusions that have undergone cryogenic treatment, will make it possible to specifically regulate their performance characteristics. The best values of strength characteristics were obtained for samples with a stabilizing additive concentration of 100 g/l. The resulting composite materials are hydrophobic, frost-resistant, characterized by a compressive strength of 2.3–6.5 MPa and a thermal conductivity of 0.19–0.20 W/(m·K). Data from differential scanning calorimetry and thermogravimetry and IR spectroscopy revealed that the binding of mineral particles by a stabilizing additive occurs due to the formation of organomineral complexes with the participation of clay minerals and the restructuring of hydration shells. SEM data indicate that crystallinity zones formed due to hydrogen bonds of hydroxyl groups of neighboring polymer chains can participate in the formation of the composite structure. An increase in the number of cryogenic treatment cycles promotes additional structuring and strengthening of the polymer phase due to the formation of additional nodes of the supramolecular network, ordering of crystallinity zones and the appearance of compacted areas in the structure. Computed X-ray tomography revealed an increase in the density of the composite upon drying, which helps to increase its strength characteristics. The structure of the sample is characterized by heterogeneity of the pore space, which is characterized by the presence of both fine-porous and large-porous regions, which determines its thermophysical properties.http://www.sciencedirect.com/science/article/pii/S2214509523010288Composite materialsOrganic-inorganic materialsTechnogenic soilStabilizing additiveStructure formationCryogenic treatment |
| spellingShingle | Pavel Pankov Dmitry Bespolitov Nikolay Shavanov Nataliya Konovalova Maria Ushkova Aleksandr Karabtsov Irina Tarasenko Valery Petukhov Igor Panarin Mikhail Zayakhanov Aleksandr Bituev Structural forming of soil composites using as a pavement subgrade strengthening Case Studies in Construction Materials Composite materials Organic-inorganic materials Technogenic soil Stabilizing additive Structure formation Cryogenic treatment |
| title | Structural forming of soil composites using as a pavement subgrade strengthening |
| title_full | Structural forming of soil composites using as a pavement subgrade strengthening |
| title_fullStr | Structural forming of soil composites using as a pavement subgrade strengthening |
| title_full_unstemmed | Structural forming of soil composites using as a pavement subgrade strengthening |
| title_short | Structural forming of soil composites using as a pavement subgrade strengthening |
| title_sort | structural forming of soil composites using as a pavement subgrade strengthening |
| topic | Composite materials Organic-inorganic materials Technogenic soil Stabilizing additive Structure formation Cryogenic treatment |
| url | http://www.sciencedirect.com/science/article/pii/S2214509523010288 |
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