About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Mukhametrakhimov Rustem Khanifovich candidate of technical sciences, associate professor Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Lukmanova Liliya Valievna post-graduate student Email: lilya0503199@gmail Kazan State University of Architecture and Engineering The organization address: 420043, Russia, Kazan, Zelenaya st., 1 |
| Title of the article | Influence of Portland cements with different mineralogical composition on basic properties of 3D-printed composites |
| Abstract. | Problem statement. The purpose of the research is to study the effect of Portland cements with different mineralogical composition on the rate of plastic strength of set cement, the main rheological characteristics of mixtures and the physical and mechanical properties of 3D hardened composites, to determine the features of their choice from among studied types of Portland cements when designing of compositions for 3DCP. Results. It was found both types of cements without mineral additives and cement with additives are most expedient to use in developing of concrete and mortar mixes for 3DCP from the position of availability of cements on the market. From the point of view of the mineralogical composition of cements, it was found cements with a high content of clinker minerals C3S and C3A are the most expedient to use because of providing a quick set of the strength of the freshly formed concrete mix at the initial time of hardening in 3DCP. From the point of view of the rate of plastic strength, mixes based on CEM II/A-P 32.5 N and CEM II/A-S 32.5 R are the most effective, which are characterized by an earlier initial set compared to the rest studied compositions. From the point of view of obtaining the most optimal rheological indicators and high physical and mechanical properties, mortar and concrete mixes based on Portland cement CEM I 42.5 N, sand with fineness modulus Mk = 3, cement-to-sand (C/S) ratio of 1:3 and mobility class Pk 2 (according to Russian standard GOST 5802-86) are the most advisable to use in 3DCP. Nevertheless, it is possible to use other studied Portland cements in 3DCP, which, to a lesser extent, contribute to obtaining optimal rheological properties, in conjunction with modifying additives. Conclusions. The significance of the results for the construction industry is to justify the choice of Portland cement when designing compositions for 3DCP taking into account its availability in the construction market, mineralogical composition, rate of structure formation and obtaining the most optimal rheological parameters and high indicators of physical and mechanical properties of composites. |
| Keywords. | concretes, mortars, cements, 3D-printing, 3DCP, additive manufacturing, rheology. |
| For citations: | Mukhametrakhimov R. Kh., Lukmanova L. V. Influence of Portland cements with different mineralogical composition on basic properties of 3D-printed composites // Izvestija KGASU. 2021. № 2 (56). Р. 37–49. DOI: 10.52409/20731523_2021_2_37. |
