The main scientific and practical results of increasing environmental and economic efficiency of using the cement dust as a partial replacement for cement are presented in the article. Physical, chemical and mechanical properties of composite Portland cement were studied when replacing from 0 to 25 % of cement with cement dust for saving difficult-to-obtain binding material. Analysis was performed related to the scientific research in this area. Laboratory experiments were conducted concerning the mathematical and physical modeling of ongoing processes. The obtained results are analyzed and generalized in accordance with the standard methods proposed by the leading experts in the field of concrete science and related industries, as well as by the authors of the article.
Ecological and economic efficiency is substantiated concerning the use of the cement dust as a partial replacement of cement when producing concrete mixtures. Proposed approach is the real way to reduce the cost of concrete and decrease the environmental impact.
Efficiency of the cement dust as an additive depends on its ability to quickly interact with the composite Portland cement due to its high lime content, i.e. the higher the percentage of the cement dust, the greater the proportion of lime. With an increase in the concentration of cement dust, it is required to increase the amount of water to obtain a standard cement paste. As a result, both the initial and final cement setting time are reduced, however, the requirements of the existing standards are not violated at this time. Even when replacing cement dust with 25 % cement, the initial setting time is at least 60 minutes. Also, the addition of cement dust does not significantly affect the hydrogen potential of the concrete mixture, which is an additional argument in favor of the use of cement dust in the production of the composite Portland cement. However, an increase in the porosity of concrete products with the addition of cement dust should be considered, leading to a significant decrease in their compressive strength.
- Sustainable benefits of concrete structures. Available at: https://www.theconcreteinitiative.eu/images/ECP_Documents/SustainableBenefitsConcreteStructures_EN.pdf (accessed: October 30, 2019).
- Alexander M., Mindess S. Aggregates in concrete. Abingdon: Taylor & Francis Group, 2005. 56 p.
- Malhotra V.M., Mehta P.K. High-performance high-volume fly ash concrete. Ottawa: Supplementary Cementing Materials for Sustainable Development, Inc., 2005. 124 p.
- Puchkov L.A., Vorobev A.E. Man and the biosphere: entry into the technosphere. Moscow: MGGU, 2000. 343 p. (In Russ.).
- Scrivener K.L., Kirkpatrick R.J. Innovation in use and research on cementitious material. Cement and Concrete Research. 2008. Vol. 38. Iss. 2. pp. 128–136. DOI: 10.1016/j.cemconres.2007.09.025
- Malhotra V.M., Mehta P.K. High-performance, high-volume fly ash concrete: materials, mixture proportioning, properties, construction practice, and case histories. Ottawa: Supplementary cementing materials for sustainable development incorporated, Inc., 2005. 101 p.
- Gang L, Kejin W. Theoretical and experimental study on shear behavior of fresh mortar. Cement and Concrete Composites. 2011. Vol. 33. Iss. 2. pp. 319–327. DOI: 10.1016/j.cemconcomp.2010.09.002
- Illston J.M., Domone P.L.J. Construction materials: their nature and behaviour. 3rd Ed. London: Spon press; 2001. 554 p.
- The European Guidelines for Self-Compacting Concrete. Specification, Production and Use. Available at: http://www.efnarc.org/pdf/SCCGuidelinesMay2005.pdf (accessed: October 30, 2019).
- El-Sayed H.A., Gabr N.A., Hanafi S., Mohran M.A. Reutilization of by-pass kiln dust in cement manufacture. Proceedings of the International Conference on Blended Cement in Construction. Sheffield, 1991.
- Batis G., Rakanta E., Sinderi E., Chaniotakis E., Papageorgiou A. Advantages of simultaneous use of cement kiln dust and blast furnace slag. Challenges of Concrete Construction. Vol. 5. Sustainable Concrete Construction. London: Thomas Telford Ltd., 2002. pp. 205–212. DOI :10.1680/scc.31777.0021
- Lyashenko V.I. Development of the Scientific and Methodical Bases for Assessment of Efficiency of Nature Protection Technologies and Technical Means at the Ore Raw Materials Development and Processing. Bezopasnost truda v promyshlennosti = Occupational Safety in Industry. 2017. № 9. pp. 30–36. (In Russ.). DOI: 10.24000/0409-2961-2017-9-30-36
- Lyashenko V.I., Dyatchin V.Z., Lisovoy I.A. Improvement of Safety of Mining Operations on the Basis of Effective Management of Mining Waste and Crude Ore Processing. Bezopasnost truda v promyshlennosti = Occupational Safety in Industry. 2017. № 11. pp. 16–22. (In Russ.). DOI: 10.24000/0409-2961-2017-11-16-22
- Golik V.I., Gabaraev O.Z., Kachurin N.M., Stas G.V. Influence of the binder preparation mode in the concretes manufacture. Ustoychivoe razvitie gornykh territoriy = Sustainable Development of Mountain Territories. 2019. Vol. 11. № 3 (41). pp. 315–320. (In Russ.). DOI: 10.21177/1998-4502-2019-11-3-315-320
- Konsta-Gdoutos M.S., Shah S.P., Bhattacharja S. Development and performance of cement kiln dust-slag cement. Challenges of Concrete Construction. Vol. 5. Sustainable Concrete Construction. London: Thomas Telford Ltd., 2002. pp. 403–410. DOI: 10.1680/scc.31777.0041
- Salem T.M., Ragai S.M. Electrical conductivity of granulated slag-cement kiln dust-silica fume pastes at different porosities. Cement and Concrete Research. 2001. Vol. 31. Iss. 5. pp. 781–787. DOI: 10.1016/S0008-8846(01)00461-6
- Maslehuddin M., Al-Amoudi O.S.B., Rahman M.K., Ali M.R., Barry M.S. Properties of cement kiln dust concrete. Construction and Building Materials. 2009. Vol. 23. Iss. 6. pp. 2357–2361. DOI: 10.1016/j.conbuildmat.2008.11.002
- Lea F.M. The Chemistry of Cement and Concrete. 3rd Ed. New York: Chemical Publishing Co., Inc., 1971. 740 p.
- El-Aleem S.A., Abd-El-Aziz M.A., Heikal M., Didamony H.E. Effect of cement kiln dust substitution on chemical and physical properties and compressive strength of portland and slag cements. Arabian Journal for Science and Engineering. 2005. Vol. 30. Iss. 2. pp. 263–274.
- NA 442. Ciment. Composition, spécifications et critères de comformité des ciments courants. Available at: https://ru.calameo.com/read/001496329437503a35a15 (accessed: October 30, 2019).
- DIN EN 196-3:2017-03. Methods of testing cement — Part 3: Determination of setting times and soundness; German version EN 196-3:2016. Berlin: Deutsches Institut für Normung, 2017. 17 p.
- DIN EN 196-2:2013. Method of testing cement — Part 2: Chemical analysis of cement. Berlin: Deutsches Institut für Normung, 2013. 74 p.