Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive
Finding new ways of recycling production waste to improve the characteristics of various building materials is an urgent scientific task. This article substantiates the possibility of the disposal of fly ash in the composition of soil concrete, which is used in the construction of the structural lay...
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| Format: | Article |
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MDPI AG
2022-07-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/14/4893 |
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| author | Nataliya Konovalova Pavel Pankov Valery Petukhov Roman Fediuk Mugahed Amran Nikolai Ivanovich Vatin |
| author_facet | Nataliya Konovalova Pavel Pankov Valery Petukhov Roman Fediuk Mugahed Amran Nikolai Ivanovich Vatin |
| author_sort | Nataliya Konovalova |
| collection | DOAJ |
| description | Finding new ways of recycling production waste to improve the characteristics of various building materials is an urgent scientific task. This article substantiates the possibility of the disposal of fly ash in the composition of soil concrete, which is used in the construction of the structural layers of road pavements, foundations of buildings and structures, as well as sites for various purposes. The scientific novelty lies in the fact that the structure formation of soil concretes based on loam and fly ash and modified with a stabilizing additive is being studied for the first time. It was found that the investigated fly ash, according to its hydraulic properties, is classified as latent active and can be introduced into the compositions of road soil concrete modified with additives of various resources. The effectiveness of the complex method of stabilization, due to changes in soil properties as a result of the use of the binding and stabilizing additives of polymer nature “Kriogelit”, is shown. It was found that the optimal content of binder and fly ash in the samples was 8 and 10 wt.%, respectively. It was established that the use of the stabilizing additive “Kriogelit” makes it possible to obtain soil concrete with the highest strength (compressive strength 2.5 MPa, flexural strength 0.5 MPa) and frost resistance of at least F15. The microstructure, the degree of dehydration and carbonization, and the phase composition of the initial raw mixtures and soil concretes stabilized with the addition of “Kriogelit” were studied by methods of scanning electron microscopy, X-ray diffraction analysis, differential scanning calorimetry, thermogravimetry, and infrared spectroscopy. It was shown that organo-mineral complexes, with the participation of polymer and montmorillonite, are formed in stabilized soil concrete. It was revealed that structure formation is accompanied by the physical adsorption of the polymer on active centers of silicate minerals, carbonization, and hydration–dehydration processes. It was found that the reason for the increase in the strength of stabilized soil concretes is the hydrophobization of the porous structure of minerals, as well as the formation of calcium oxide silicate and dicalcium hydrated silicate. By the method of performing biotests with the test objects <i>Daphnia magna </i>Straus and <i>Chlorella vulgaris</i> Beijer, it was proven that the developed road concretes modified with the stabilizing additive “Kriogelit” do not have an acute toxic effect on the test objects and are safe for the environment and human health. |
| first_indexed | 2024-03-09T06:17:09Z |
| format | Article |
| id | doaj.art-d21bd4ddf0ae4677aee1a3ab24bea9e1 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T06:17:09Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-d21bd4ddf0ae4677aee1a3ab24bea9e12023-12-03T11:52:06ZengMDPI AGMaterials1996-19442022-07-011514489310.3390/ma15144893Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer AdditiveNataliya Konovalova0Pavel Pankov1Valery Petukhov2Roman Fediuk3Mugahed Amran4Nikolai Ivanovich Vatin5Irkutsk State Transport University, 664074 Irkutsk, RussiaIrkutsk State Transport University, 664074 Irkutsk, RussiaFar Eastern Federal University, 690922 Vladivostok, RussiaFar Eastern Federal University, 690922 Vladivostok, RussiaDepartment of Civil Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Alkharj 11942, Saudi ArabiaPeter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, RussiaFinding new ways of recycling production waste to improve the characteristics of various building materials is an urgent scientific task. This article substantiates the possibility of the disposal of fly ash in the composition of soil concrete, which is used in the construction of the structural layers of road pavements, foundations of buildings and structures, as well as sites for various purposes. The scientific novelty lies in the fact that the structure formation of soil concretes based on loam and fly ash and modified with a stabilizing additive is being studied for the first time. It was found that the investigated fly ash, according to its hydraulic properties, is classified as latent active and can be introduced into the compositions of road soil concrete modified with additives of various resources. The effectiveness of the complex method of stabilization, due to changes in soil properties as a result of the use of the binding and stabilizing additives of polymer nature “Kriogelit”, is shown. It was found that the optimal content of binder and fly ash in the samples was 8 and 10 wt.%, respectively. It was established that the use of the stabilizing additive “Kriogelit” makes it possible to obtain soil concrete with the highest strength (compressive strength 2.5 MPa, flexural strength 0.5 MPa) and frost resistance of at least F15. The microstructure, the degree of dehydration and carbonization, and the phase composition of the initial raw mixtures and soil concretes stabilized with the addition of “Kriogelit” were studied by methods of scanning electron microscopy, X-ray diffraction analysis, differential scanning calorimetry, thermogravimetry, and infrared spectroscopy. It was shown that organo-mineral complexes, with the participation of polymer and montmorillonite, are formed in stabilized soil concrete. It was revealed that structure formation is accompanied by the physical adsorption of the polymer on active centers of silicate minerals, carbonization, and hydration–dehydration processes. It was found that the reason for the increase in the strength of stabilized soil concretes is the hydrophobization of the porous structure of minerals, as well as the formation of calcium oxide silicate and dicalcium hydrated silicate. By the method of performing biotests with the test objects <i>Daphnia magna </i>Straus and <i>Chlorella vulgaris</i> Beijer, it was proven that the developed road concretes modified with the stabilizing additive “Kriogelit” do not have an acute toxic effect on the test objects and are safe for the environment and human health.https://www.mdpi.com/1996-1944/15/14/4893utilization of industrial wastefly ashsoil stabilizationroad construction materialssoil concretestabilizing additive |
| spellingShingle | Nataliya Konovalova Pavel Pankov Valery Petukhov Roman Fediuk Mugahed Amran Nikolai Ivanovich Vatin Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive Materials utilization of industrial waste fly ash soil stabilization road construction materials soil concrete stabilizing additive |
| title | Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive |
| title_full | Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive |
| title_fullStr | Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive |
| title_full_unstemmed | Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive |
| title_short | Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive |
| title_sort | structural formation of soil concretes based on loam and fly ash modified with a stabilizing polymer additive |
| topic | utilization of industrial waste fly ash soil stabilization road construction materials soil concrete stabilizing additive |
| url | https://www.mdpi.com/1996-1944/15/14/4893 |
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