Published at : 21 Dec 2020
Volume : IJtech
Vol 11, No 8 (2020)
DOI : https://doi.org/10.14716/ijtech.v11i8.4542
Ludmila Voropai | Vologda State University, Lenina Street 15, Vologda, 160000, Russia |
Olga Kuznetsova | Vologda State University, Lenina Street 15, Vologda, 160000, Russia |
Anton Sinitsyn | Vologda State University, Lenina Street 15, Vologda, 160000, Russia |
Olga Yukhtarova | Vologda State University, Lenina Street 15, Vologda, 160000, Russia |
Irina Akhmetova | Kazan State Power Engineering University, Kazan, Krasnoselskaya Street, 5, 1420066, Russia |
Irina Atamanyuk | Hamburg University of Technology, Hamburg 21073, Germany |
Svetlana Ilyashenko | Plekhanov Russian University of Economics, Moscow 117997, Russia |
The relationship between the
performance characteristics (e.g., thermal conductivity, specific density, and
compressive strength) of a peat heat-insulating composite and its chemical
composition has been established. It has also been experimentally proven that
high-lying peat and limestone from the Vologda Oblast deposits correspond in
chemical composition and structural features to the requirements for producing
heat-insulating materials (HIMs). Composite samples with different chemical
compositions were obtained under laboratory conditions. To increase the
mechanical strength and setting speed when collecting samples, a stage of peat
steaming with water vapor and carbon dioxide was provided. HIM testing using modern analytical
methods has proven a relationship exists between the content of high-lying
peat, quicklime in samples, and
their performance characteristics. The optimal chemical composition for
obtaining composites was selected. High-lying peat with a moisture content of
30.0% after steaming and quicklime content of 29.0% ensured the production of a
composite with the following indicators: thermal conductivity of 0.041 W/m?°C;
average density of 259 kg/m3; compressive strength of 3.02 MPa; and
toxicity index of less than 0.5. The established dependence enables simulation
of the technological process and obtains materials with the desired properties.
Heat insulating; HIM; Thermal conductivity
Various composite heat-insulating materials (HIMs) are used in the modern construction industry to create comfortable conditions while reducing energy and material costs during the construction and operation of buildings and structures (Gudkov et al., 2019; Latief et al., 2019; Ujma and Umnyakova, 2019; Pavlov et al., 2020). The distinctive characteristics of these materials are high porosity, low thermal conductivity, and average density to ensure their secondary use as sound-absorbing materials.
Increased material porosity results in a lower resistance to aggressive environmental factors, higher fragility, and water absorption. These features must be considered when developing new types of heat-insulating materials, which always include heat insulators, i.e. the components with porous surfaces (Abdel-Rehim et al., 2006; Baetens, 2013; Han et al., 2015; Abdulkareem et al., 2016; Abu-Jdayil et al., 2019). To increase mechanical strength and chemical resistance, binders are added, which can also act as heat insulators, fire retardants, antiseptics, and water repellents (Bekbayeva et al., 2020; Voropai et al., 2020; Yukhtarova, 2020). In construction industry, substances of natural, artificial, and synthetic origin are used as heat insulators (e.g., wood, plant raw materials of fibrous structure, liquid and solid synthetic polymers). Gypsum, limestone, tuffs, Portland cement, slaked lime, quicklime, and dust from construction industries can be used as binders. In recent years, polymers (substances of organic origin) have been used instead of mineral binders (Kopanitsa et al., 2006; 2007; 2010).
When choosing a raw material and its amount, it is necessary to consider not only the ability of materials to form a certain number of pores per unit volume, but also the size of the pores, the degree of their openness or closure, and their shape. It is known that a large-pore, concave structure with elongated pores increases the coefficient of thermal conductivity (Ordonez-Miranda and Alvarado-Gil, 2012). Lower thermal conductivity is registered for materials with larger volumes of air trapped in their pores and smaller amounts of solid matter contained in a unit volume of the composite surrounding the pores. Therefore, to obtain an HIM with low thermal conductivity, high mechanical strength, and low specific density, it is necessary to add binders to the composite that will form a single porous structure with HIM after heat treatment and structure formation in air. In our previous work (Yukhtarova, 2020) we developed a new HIM composition based on high-lying peat, sawdust, and binding components—gypsum and a mixture of organosilicon polymers and oligomers (K-9, PVB, MSN-7. After heat treatment, an HIM with useful characteristics (thermal conductivity of 0.049 W/m·°C; compressive strength of 1.59 MPa; average density of 242 kg/m3) was obtained. The aim of this work is to develop a new technology for producing insulating composite with reduced energy, material costs, and product costs, while maintaining the relevant requirements for construction materials, simplifying the technology required for their production, and resolving issues of production waste disposal. Quicklime setting processes occur at lower temperatures than those of gypsum setting processes, so our newly developed technology will use high-lying peat and quicklime as raw materials. The carbonization and hydration processes of quicklime after steaming cause a more porous and solid structure to be formed with a lower specific gravity than a gypsum-based composite.
This
paper presents the production stages according to the new technology and
establishes the impact of chemical composition on HIM performance
characteristics. The course of the work obtained the following: (i) properties
and chemical composition of natural raw materials (i.e., high-lying peat and
quicklime); (ii) samples of heat insulators using the newly developed
technology; (iii) testing of obtained samples to determine the optimal
composition of the initial mixture, heat treatment conditions, and obtained
composite properties.
The properties of naturally available materials (high-lying peat taken from the Maega deposit of the Vologda region and quicklime obtained from the limestone of the Belo-Rucheysky deposit in the Vytegorsky district of the Vologda region) were studied. The obtained results prove their value in producing thermal insulation materials.
A new type of HIM based on high-lying peat and quicklime was obtained. In contrast to typical technologies, the formation of a solid structure occurred by processing wet peat samples with a mixture of water vapor and carbon dioxide, then carbonizing quicklime. Testing results proved that replacing gypsum with quicklime while excluding sawdust and a three-component polymer from the composite helped simplify the technology for obtaining HIM while improving HIM characteristics. The relationship between the operational properties of the obtained composite samples and their chemical composition was established. Based on this relationship, it is possible to simulate the technology of obtaining composites. The optimal chemical composition for obtaining composites was selected. The content of high-lying peat with a moisture content of 30.0% (after treatment with water and carbon dioxide) and 29.0% quicklime provided a composite with the following indicators: thermal conductivity coefficient is 0.041 W/m·°C; average density is 259 kg/m3; compressive strength is 3.02 MPa; toxicity index is less than 0.5.
Abdel-Rehim, Z.S.,
Saad, M.M., El-Shakankery, M., Hanafy, I., 2006. Textile Fabrics as Thermal
Insulators. Autex Research Journal,
Volume 6(3), pp. 148–161
Abdulkareem, S.,
Ogunmodede, S., Aweda, J.O., Abdulrahim, A.T., Ajiboye, T.K., Ahmed, I.I.,
Adebisi, J.A., 2016. Investigation of Thermal Insulation Properties of Biomass
Composites. International Journal of Technology, Volume 7(6), pp. 989–999
Abu-Jdayil, B.,
Mourad, A.H., Hittini, W., Hassan, M., Hameedi, S., 2019. Traditional,
State-Of-The-Art and Renewable Thermal Building Insulation Materials: An
Overview. Construction and Building Materials, Volume 214, pp. 709–735
Bekbayeva, L.,
Negim, E.-S., Gulzhakhan, Y., Ganjian, E., 2020. Utilization of Poly(Polyvinyl
Alcohol-g-2-Ethylhexyl Acrylate) as Admixture for Mortar. International
Journal of Technology, Volume 11(2), pp. 259–268
Baetens, R., 2013.
High performance Thermal Insulation Materials for Buildings. In: Nanotechnology in Eco-Efficient Construction: Materials, Processes and
Applications. PachecoTorgal, F., Diamanti, M.V., Nazari, A.; Granqvist,
C.G. (Editors). Woodhead Publ LTD. Cambridge, Sawston, United Kingdom doi:10.1533/9780857098832.2.188
GOST 4861-74.,
1981. Peat Thermal-insulating Plates.
Moscow: Izdatelstvo Standartov
Gudkov, P., Kagan,
P., Pilipenko, A., Zhukova, E.Y., Zinovieva, E.A., Ushakov, N.A., 2019. Usage
of Thermal Isolation Systems for Low-Rise Buildings as a Component of Information
Models. E3S Web of Conferences, Volume
97.
doi:10.1051/e3sconf/20199701039
Han, Y., Zhang, X.,
Wu, X., Lu, C., 2015. Flame Retardant, Heat Insulating Cellulose Aerogels from
Waste Cotton Fabrics by in Situ Formation of Magnesium Hydroxide Nanoparticles
in Cellulose Gel Nanostructures. ACS Sustainable Chemistry and Engineering,
Volume 3(8), pp. 1853–1859
Kopanitsa, N.O.,
Kudyakov, A.I., Kalashnikova, M.A,. 2006. Patent 2273620 RF, MPK S 04 B 38/06.
Peat-Wood Composition for the Manufacture of Heat-Insulating Building
Materials. Applicant and patentee GOUVPO “TGASU”. - No. 2004108271/03; decl.
03/22/2004; publ. 10.04.2006, bul. No. 10
Kopanitsa, N.O.,
Kudyakov, A.I., Kalashnikova, M.A., 2007. Patent 2307813 RF, MPK (51) S 04B
38/00. Peat-Wood Composition for the Manufacture of Structural and Thermal
Insulation Materials. Applicant and patentee GOUVPO “TGASU”. - No.
2005130585/03, decl. 03.10.2005; publ. 10.10.2007, bul. No. 28
Kopanitsa, N.O.,
Kudyakov, A.I., Kalashnikova, M.A., 2010. Patent 2393128 RF, MPK S 04 B 26/00.
Thermal Insulation Composition for the Production of Peat-Based Building
Materials. Applicant and patentee GOUVPO “TSASU”. - No. 2008101233/03; decl.
09.01.2008; publ. 06/27/2010, bul. No. 18
Latief,
Y., Berawi, M.A., Koesalamwardi, A.B., Sagita, L., Herzanita, A., 2019. Cost
Optimum Design of a Tropical Near Zero Energy House (nZEH). International
Journal of Technology, Volume 10(2),
pp. 376–385
Ordonez-Miranda, J.,
Alvarado-Gil, J., 2012. Effect of the Pore Shape on the Thermal Conductivity of
Porous Media. Journal of Materials
Science, Volume 47, pp. 6733–6740
Pavlov, M., Karpov,
D., Akhmetova, I., Monarkin, N., 2020. Assessment of Energy Efficiency of
Application Heat-Insulating Paint for the Needs of District Heat Supply
Systems. E3S Web of Conferences, Volume
178.
doi:10.1051/e3sconf/202017801004
Sinitsyn, A., Voropay,
L., Salikhova, R., Yukhtarova, O., 2020. Relationship between Operational Properties
of Peat Heat-insulating Materials and the Content of Mineral Binders in Them. E3S
Web Conferences. Volume 178. doi: 10.1051/e3sconf/202017801047
Stapulionien?, R.,
Vaitkus, S., Kremensas, A., 2015. Thermal Conductivity Investigation of
Composite from Hemp and Peat Fibres. Environmental Engineering and
Management Journal, Volume 14(9),
pp. 2213–2220
Ujma, A.,
Umnyakova, N., 2019. Thermal Efficiency of the Building Envelope with the Air
Layer and Reflective Coatings. E3S Web of
Conferences, Volume 100.
doi:10.1051/e3sconf/201910000082
Vasi?jeva, T.,
Korjakins, A., 2017. The Development of Peat and Wood-based Thermal Insulation
Material Production Technology. Construction Science, Volume 20(1),
pp. 60–67
Voropai,
L., Duryagina, Y.A., Sinitsyn, A.A., Yukhtarova, O.S., 2020. Development of a
New Method for Producing Heat-Insulating Materials based on High-Lying Peat and
Fluorine-Containing Polymers. In: Materials of the All-Russian Scientific and
Practical Conference: “Modern Trends in the Development of Chemical Technology,
Industrial Ecology and Technosphere Safety”, St. Petersburg, Russia, pp.
310–313. V.A. Basova (Editor). Higher School of Technology and Power
Engineering of Saint-Petersburg State University of Industrial Technologies and
Design
Yukhtarova,
O.S., 2020. Dependence of the Physical and Mechanical Properties of Composite
Thermal Insulation Materials on the Structure of Peat and its Content in the
Composite. In: Materials of the XVI International
Scientific and Practical Conference “Strategic Issues of World Science”, Vol.
IV: Problems of Scientific Thought, Poland, p. 17. Moscow, Internauka