WITH INTERNATIONAL SYMPOSIUM ON RESEARCHING AND APPLICATION OF MODERN ACHIEVEMENTS IN CIVIL ENGINEERING IN THE FIELD OF MATERIALS AND STRUCTURES

XXIX kongres DIMK i X kongres SIGP sa Međunarodnim simpozijumom o istraživanjima i primeni savremenih dostignuća u građevinarstvu u oblasti materijala i konstrukcija (2025) [pp. 138-147]  

AUTHOR(S) / AUTOR(I): Stefan Ž. Mitrović , Ivan Ignjatović 

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DOI: 10.46793/29DIMK.138M

ABSTRACT / SAŽETAK:

This study analyzes the impact of chemical admixtures on the basic properties of 3D printed concrete. The investigation was carried out using two commercial chemical admixtures, the superplasticizer SikaViscoCrete®-5500 Iron and the hydration controller SikaTard®-930, both manufactured by Sika. The experimental program included the testing of concrete properties in fresh and hardened states, using four different mixtures (named A, B, C, and D), which were prepared by varying the dosages of the used admixtures. The open time and extrudability were determined in the fresh state for all mixtures, and the extrudability test was used as an indicator of the printability of the concrete mixture. For selected mixtures (A and D), the bulk density and compressive strength was tested at various ages on mold cast and 3D printed samples. Based on the obtained results, an analysis of the impact of chemical admixtures was performed, highlighting the main conclusions regarding the effects of admixtures on the basic properties of 3D printed concrete.

KEYWORDS / KLJUČNE REČI:

3D printed concrete, chemical admixtures, experimental investigation, density, open time, extrudability, compressive strength

ACKNOWLEDGEMENT / PROJEKAT:

The authors gratefully acknowledge the support of Nenad Zorić and SIKA Serbia, which provided materials needed for experimental testing. For assistance in conducting the experimental part, the authors would like to thank their colleagues from the Laboratory for Materials of the Faculty of Civil Engineering at the University of Belgrade, Sava Stavnjak and Radomir Petrović. This research was supported by the Ministry of Science, Technological Development, and Innovation of the Republic of Serbia (grant number 2000092).

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