Alkali-activated cementitious composites for 3D technologies in construction
Students Name: Khabarova Vira Andriivna
Qualification Level: master (ESP)
Speciality: Building and Civil Engineering
Institute: Institute of Civil Engineering and Building Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: англійська
Abstract: Khabarova V.A., Sanitsky M.A. (supervisor). Alkaline-activated cementitious composites for 3D technologies in construction. Master’s qualification work. – Lviv Polytechnic National University, Lviv, 2021. Extended abstract. The technology of three-dimensional printing in construction is of interest due to the increased speed of construction of building structures, reducing labor costs, construction waste and risks to the health of workers [1]. An important task for the implementation of 3D-printing is the selection of compositions of composite building materials that meet the required characteristics of the building. For this purpose fine-grained concrete mixes are used [2]. One of the materials that can significantly change the efficiency of composites printed in 3D are nanomaterials (the inclusion of nanoparticles has a significant impact on the efficiency of printed composite materials) [3]. Alkali-activated cementing composites are binders that are characterized by approximately 80-90% lower CO2 emissions and provide mechanical and thermophysical properties comparable to conventional concrete [4]. This composite is made in the process of alkali activation of materials based on aluminosilicate, such as blast furnace slag, removal ash, zeolite or metakaolin [5]. Natural zeolite as a partial replacement of Portland cement can increase the mechanical properties and durability of concrete composites for 3D printing [6]. The object of research – process of alkaline activation of portland cement to provide the necessary properties for additive printing. The subject of research – composition of alkali-activated cementing composite with the use of zeolite-containing portland cement and the addition of superplasticizer and the construction of the wall from it. The purpose of the study: to investigate the properties of materials for 3D printing, as well as to develop the composition of alkaline-activated cementing composite, which is compatible with 3D printing technology and can become a building structure. The presented results of experimental studies of mixtures with the use of zeolite for 3D printing technology show that when using the proposed concrete compositions, the strength in the early stages of hardening increases. That is, it is possible to produce alkali-activated cementitious materials for use in 3D construction, the advantage of which is the reduction of CO2 emissions, as well as improved strength and durability. Keywords: 3D printing; alkaline-activated cementing composites; geo-polymer concrete; materials activated by alkalis; nanomaterials. References. 1. De Schutter, G., Lesage, K., Mechtcherine, V., Nerella, V. N., Habert, G., & Agusti-Juan, I. (2018). Vision of 3D printing with concrete—technical, economic and environmental potentials. Cement and Concrete Research, 112, 25-36. doi: 10.1016/j.cemconres.2018.06.001. 2. Hager, I., Golonka, A., & Putanowicz, R. (2016). 3D printing of buildings and building components as the future of sustainable construction?. Procedia Engineering, 151, 292-299. doi: 10.1016/j.proeng.2016.07.357. 3. Sikora, P., Chougan, M., Cuevas, K., Liebscher, M., Mechtcherine, V., Ghaffar, S. H., ... & Stephan, D. (2021). The effects of nano-and micro-sized additives on 3D printable cementitious and alkali-activated composites: A review. Applied Nanoscience, 1-19. doi: 10.1007/s13204-021-01738-2. 4. Kashani, A., Provis, J. L., Qiao, G. G., & van Deventer, J. S. (2014). The interrelationship between surface chemistry and rheology in alkali activated slag paste. Construction and Building Materials, 65, 583-591. doi.10.1016/j.conbuildmat.2014.04.127. 5. Xia, M., & Sanjayan, J. (2016). Method of formulating geopolymer for 3D printing for construction applications. Materials & Design, 110, 382-390. doi: 10.1016/j.matdes.2016.07.136. 6. Sanytsky, M., Kropyvnytska, T., Kruts, T., Horpynko, O., & Geviuk, I. (2018). Design of rapid hardening quaternary zeolite-containing Portland-composite cements. In Key Engineering Materials (Vol. 761, pp. 193-196). Trans Tech Publications Ltd. doi: 10.4028/www.scientific.net/KEM.761.1