TY  - JOUR
AU  - Mitrović, Stefan
AU  - Vidović, Milica
AU  - Ignjatović, Ivan
AU  - Dragaš, Jelena
PY  - 2024
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3530
AB  - In the last few decades, the technology of 3D concrete printing (3DCP) has had a significant development. This technology has a great potential to improve efficiency in the construction industry. It can provide safer site working conditions, material savings, a reduction of construction time, and a high versatility of architectural and structural design. However, this new technology is still not fully investigated. The wider application is limited by the lack of standards and guidelines for design and production. The literature review showed that, there are only a few studies investigating structural behaviour of 3DCP structures and elements. Beams and walls with and without addition of fibers, reinforcement or cables under ultimate loads were tested. The incorporation of reinforcement in the printing process, connections between printed pieces and long-term behaviour of 3DCP elements under sustained load are opened questions. The topic of this research was an experimental testing of 3DCP truss girder. Printing of truss girder was done using a commercial, ready-to-use premix Sikacrete® 751 3D. In order to print, the printer head was moved in the Z direction to alternately place two desired path layers. A truss girder with dimensions of 87x29x12 cm, without reinforcement, was subjected to a four-point bending test up to failure. During this testing strains in two diagonals, deflection of the two bottom joints, and ultimate force were measured. Ultimate force was 30 kN and the brittle failure of tensioned bottom chord occurred. The force in tensioned diagonal was 13.45 kN and in the compressed one 36.77 kN. Additionally, three samples obtained from the top and bottom chords were tested on axial tension. The tension capacity of samples was 25.12 kN.
PB  - Institut za istraživanja i projektovanja u privredi
T2  - Journal of Applied Engineering Science
T1  - Experimental testing of 3d printed concrete truss girder
EP  - 260
IS  - 2
SP  - 253
VL  - 22
DO  - 10.5937/jaes0-50408
ER  - 

@article{
author = "Mitrović, Stefan and Vidović, Milica and Ignjatović, Ivan and Dragaš, Jelena",
year = "2024",
abstract = "In the last few decades, the technology of 3D concrete printing (3DCP) has had a significant development. This technology has a great potential to improve efficiency in the construction industry. It can provide safer site working conditions, material savings, a reduction of construction time, and a high versatility of architectural and structural design. However, this new technology is still not fully investigated. The wider application is limited by the lack of standards and guidelines for design and production. The literature review showed that, there are only a few studies investigating structural behaviour of 3DCP structures and elements. Beams and walls with and without addition of fibers, reinforcement or cables under ultimate loads were tested. The incorporation of reinforcement in the printing process, connections between printed pieces and long-term behaviour of 3DCP elements under sustained load are opened questions. The topic of this research was an experimental testing of 3DCP truss girder. Printing of truss girder was done using a commercial, ready-to-use premix Sikacrete® 751 3D. In order to print, the printer head was moved in the Z direction to alternately place two desired path layers. A truss girder with dimensions of 87x29x12 cm, without reinforcement, was subjected to a four-point bending test up to failure. During this testing strains in two diagonals, deflection of the two bottom joints, and ultimate force were measured. Ultimate force was 30 kN and the brittle failure of tensioned bottom chord occurred. The force in tensioned diagonal was 13.45 kN and in the compressed one 36.77 kN. Additionally, three samples obtained from the top and bottom chords were tested on axial tension. The tension capacity of samples was 25.12 kN.",
publisher = "Institut za istraživanja i projektovanja u privredi",
journal = "Journal of Applied Engineering Science",
title = "Experimental testing of 3d printed concrete truss girder",
pages = "260-253",
number = "2",
volume = "22",
doi = "10.5937/jaes0-50408"
}

Mitrović, S., Vidović, M., Ignjatović, I.,& Dragaš, J.. (2024). Experimental testing of 3d printed concrete truss girder. in Journal of Applied Engineering Science
Institut za istraživanja i projektovanja u privredi., 22(2), 253-260.
https://doi.org/10.5937/jaes0-50408

Mitrović S, Vidović M, Ignjatović I, Dragaš J. Experimental testing of 3d printed concrete truss girder. in Journal of Applied Engineering Science. 2024;22(2):253-260.
doi:10.5937/jaes0-50408 .

Mitrović, Stefan, Vidović, Milica, Ignjatović, Ivan, Dragaš, Jelena, "Experimental testing of 3d printed concrete truss girder" in Journal of Applied Engineering Science, 22, no. 2 (2024):253-260,
https://doi.org/10.5937/jaes0-50408 . .

TY  - JOUR
AU  - Poletanović, Bojan
AU  - Dragaš, Jelena
AU  - Ignjatović, Ivan
AU  - Komljenović, Miroslav
AU  - Merta, Ildiko
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2172
AB  - Two alkali-activated mortars with different solid prime materials were analysed. The first mortar contained fly ash, had lower density, higher water absorption, lower compactness, lower compressive strength, similar flexural strength and was less brittle than the second one with fly ash + slag.
The addition of hemp fibres slightly changed the mortars’ density, water absorption, compressive and flexural strength, however significantly increased its energy absorption capacity.
The initially more brittle matrix exhibited significantly higher relative toughness increase. The smoother and less porous fibre/matrix interface assured through numerous fibre/matrix contact points a more optimal fibre/matrix interfacial bond- and frictional stress transfer.
PB  - Elsevier Ltd.
T2  - Construction and Building Materials
T1  - Physical and mechanical properties of hemp fibre reinforced alkali-activated fly ash and fly ash/slag mortars
SP  - 119677
VL  - 259
DO  - 10.1016/j.conbuildmat.2020.119677
ER  - 

@article{
author = "Poletanović, Bojan and Dragaš, Jelena and Ignjatović, Ivan and Komljenović, Miroslav and Merta, Ildiko",
year = "2020",
abstract = "Two alkali-activated mortars with different solid prime materials were analysed. The first mortar contained fly ash, had lower density, higher water absorption, lower compactness, lower compressive strength, similar flexural strength and was less brittle than the second one with fly ash + slag.
The addition of hemp fibres slightly changed the mortars’ density, water absorption, compressive and flexural strength, however significantly increased its energy absorption capacity.
The initially more brittle matrix exhibited significantly higher relative toughness increase. The smoother and less porous fibre/matrix interface assured through numerous fibre/matrix contact points a more optimal fibre/matrix interfacial bond- and frictional stress transfer.",
publisher = "Elsevier Ltd.",
journal = "Construction and Building Materials",
title = "Physical and mechanical properties of hemp fibre reinforced alkali-activated fly ash and fly ash/slag mortars",
pages = "119677",
volume = "259",
doi = "10.1016/j.conbuildmat.2020.119677"
}

Poletanović, B., Dragaš, J., Ignjatović, I., Komljenović, M.,& Merta, I.. (2020). Physical and mechanical properties of hemp fibre reinforced alkali-activated fly ash and fly ash/slag mortars. in Construction and Building Materials
Elsevier Ltd.., 259, 119677.
https://doi.org/10.1016/j.conbuildmat.2020.119677

Poletanović B, Dragaš J, Ignjatović I, Komljenović M, Merta I. Physical and mechanical properties of hemp fibre reinforced alkali-activated fly ash and fly ash/slag mortars. in Construction and Building Materials. 2020;259:119677.
doi:10.1016/j.conbuildmat.2020.119677 .

Poletanović, Bojan, Dragaš, Jelena, Ignjatović, Ivan, Komljenović, Miroslav, Merta, Ildiko, "Physical and mechanical properties of hemp fibre reinforced alkali-activated fly ash and fly ash/slag mortars" in Construction and Building Materials, 259 (2020):119677,
https://doi.org/10.1016/j.conbuildmat.2020.119677 . .