TY  - JOUR
AU  - Kostić, Srđan
AU  - Vasović, Dejan
AU  - Okrajnov-Bajić, Ruža
PY  - 2014
UR  - https://raf.arh.bg.ac.rs/handle/123456789/169
AB  - A new type of calcium-nitrate and urea-based chemical admixture is proposed, in order to maintain the compressive strength of fresh concrete exposed to very low temperatures (below to - 250C), including a sudden transition to positive temperatures at an early age. The applied admixture has no negative effect on compressive strength of specimens cured in water at 200C. When it is cured under three different frost regimes, concrete specimens with admixture show over three times higher compressive strength, in comparison to specimens without admixture. The implications of such improved concrete composition are discussed in reference to the tunnel lining design.
AB  - U radu se predlaže novi tip hemijskog dodatka betonu na bazi kalcijum-nitrata i uree, sa ciljem održavanja čvrstoće na pritisak svežeg betona izloženog vrlo niskim temperaturama (do -250C), uključujući i uticaj iznenadnih velikih temperaturnih amplituda (prelaze od negativnih ka pozitivnim temperaturama). Primenjeni dodatak ne utiče nepovoljno na čvrstoću na pritisak uzoraka betona negovanih u izotermalnim uslovima na temperaturi od 200C. Kada se svež beton izloži uticaju različitih režima mraza, uzorci sa dodatkom pokazuju gotovo tri puta veću pritisnu čvrstoću u poređenju sa uzorcima bez dodatka. Primena betona sa predloženim aditivom u praksi razmatra se u odnosu na postojanost i stabilnost tunelske obloge sa prskanim betonom.
PB  - Institut za rudarstvo i metalurgiju, Bor
T2  - Mining and Metallurgy Engineering Bor
T1  - New fresh concrete chemical admixture for tunnel lining design in the extreme winter conditions
T1  - Novi hemijski dodatak svežem betonu za izvođenje tunelske obloge u ekstremnim zimskim uslovima
IS  - 2
SP  - 13
EP  - 32
DO  - 10.5937/mmeb1402013k
ER  - 

@article{
author = "Kostić, Srđan and Vasović, Dejan and Okrajnov-Bajić, Ruža",
year = "2014",
abstract = "A new type of calcium-nitrate and urea-based chemical admixture is proposed, in order to maintain the compressive strength of fresh concrete exposed to very low temperatures (below to - 250C), including a sudden transition to positive temperatures at an early age. The applied admixture has no negative effect on compressive strength of specimens cured in water at 200C. When it is cured under three different frost regimes, concrete specimens with admixture show over three times higher compressive strength, in comparison to specimens without admixture. The implications of such improved concrete composition are discussed in reference to the tunnel lining design., U radu se predlaže novi tip hemijskog dodatka betonu na bazi kalcijum-nitrata i uree, sa ciljem održavanja čvrstoće na pritisak svežeg betona izloženog vrlo niskim temperaturama (do -250C), uključujući i uticaj iznenadnih velikih temperaturnih amplituda (prelaze od negativnih ka pozitivnim temperaturama). Primenjeni dodatak ne utiče nepovoljno na čvrstoću na pritisak uzoraka betona negovanih u izotermalnim uslovima na temperaturi od 200C. Kada se svež beton izloži uticaju različitih režima mraza, uzorci sa dodatkom pokazuju gotovo tri puta veću pritisnu čvrstoću u poređenju sa uzorcima bez dodatka. Primena betona sa predloženim aditivom u praksi razmatra se u odnosu na postojanost i stabilnost tunelske obloge sa prskanim betonom.",
publisher = "Institut za rudarstvo i metalurgiju, Bor",
journal = "Mining and Metallurgy Engineering Bor",
title = "New fresh concrete chemical admixture for tunnel lining design in the extreme winter conditions, Novi hemijski dodatak svežem betonu za izvođenje tunelske obloge u ekstremnim zimskim uslovima",
number = "2",
pages = "13-32",
doi = "10.5937/mmeb1402013k"
}

Kostić, S., Vasović, D.,& Okrajnov-Bajić, R.. (2014). New fresh concrete chemical admixture for tunnel lining design in the extreme winter conditions. in Mining and Metallurgy Engineering Bor
Institut za rudarstvo i metalurgiju, Bor.(2), 13-32.
https://doi.org/10.5937/mmeb1402013k

Kostić S, Vasović D, Okrajnov-Bajić R. New fresh concrete chemical admixture for tunnel lining design in the extreme winter conditions. in Mining and Metallurgy Engineering Bor. 2014;(2):13-32.
doi:10.5937/mmeb1402013k .

Kostić, Srđan, Vasović, Dejan, Okrajnov-Bajić, Ruža, "New fresh concrete chemical admixture for tunnel lining design in the extreme winter conditions" in Mining and Metallurgy Engineering Bor, no. 2 (2014):13-32,
https://doi.org/10.5937/mmeb1402013k . .

TY  - JOUR
AU  - Okrajnov-Bajić, Ruža
AU  - Vasović, Dejan
PY  - 2009
UR  - https://raf.arh.bg.ac.rs/handle/123456789/62
AB  - In majority of the most modern architectural designs realized in the past 10-20 years, concrete having features in fresh and hardened state as well as making, placing and curing techniques that are defined in detail was used. Quite frequently concrete which was self-compacting in fresh state was used. In order to get acquainted with this material and with possibilities of its application this paper presents various buildings in which it was used. The definition of self-compacting concrete is given and advantages of its application are underlined. Next, features of fresh SCC, test methods are described in detail and classifications especially defined for this material are proposed. .
PB  - Institut za arhitekturu i urbanizam Srbije, Beograd
T2  - Spatium
T1  - Self-compacting concrete and its application in contemporary architectural practice
IS  - 20
SP  - 28
EP  - 34
DO  - 10.2298/SPAT0920028O
ER  - 

@article{
author = "Okrajnov-Bajić, Ruža and Vasović, Dejan",
year = "2009",
abstract = "In majority of the most modern architectural designs realized in the past 10-20 years, concrete having features in fresh and hardened state as well as making, placing and curing techniques that are defined in detail was used. Quite frequently concrete which was self-compacting in fresh state was used. In order to get acquainted with this material and with possibilities of its application this paper presents various buildings in which it was used. The definition of self-compacting concrete is given and advantages of its application are underlined. Next, features of fresh SCC, test methods are described in detail and classifications especially defined for this material are proposed. .",
publisher = "Institut za arhitekturu i urbanizam Srbije, Beograd",
journal = "Spatium",
title = "Self-compacting concrete and its application in contemporary architectural practice",
number = "20",
pages = "28-34",
doi = "10.2298/SPAT0920028O"
}

Okrajnov-Bajić, R.,& Vasović, D.. (2009). Self-compacting concrete and its application in contemporary architectural practice. in Spatium
Institut za arhitekturu i urbanizam Srbije, Beograd.(20), 28-34.
https://doi.org/10.2298/SPAT0920028O

Okrajnov-Bajić R, Vasović D. Self-compacting concrete and its application in contemporary architectural practice. in Spatium. 2009;(20):28-34.
doi:10.2298/SPAT0920028O .

Okrajnov-Bajić, Ruža, Vasović, Dejan, "Self-compacting concrete and its application in contemporary architectural practice" in Spatium, no. 20 (2009):28-34,
https://doi.org/10.2298/SPAT0920028O . .

TY  - JOUR
AU  - Okrajnov-Bajić, Ruža
AU  - Pecić, Nenad
PY  - 2009
UR  - https://raf.arh.bg.ac.rs/handle/123456789/59
AB  - Design proceedings of reinforced concrete in accordance with EN 1992-1-1:2004 Eurocode 2 and with current Serbian regulations PBAB-87 are given. The difference in design and results between members not requiring design shear reinforcement and members requiring design shear reinforcement are analyzed. Minimal reinforcement ratio for shear reinforcement is particularly considered.
AB  - Dati su postupci proračuna armiranobetonskih elemenata opterećenih smicanjem prema EN 1992-1-1: 2004 Evrokod 2 i prema važećem srpskom pravilniku PBAB-87. Analizirane su razlike u proračunu i dobijenim rezultatima u slučaju elemenata bez potrebne računske armature za prijem smicanja i elemenata sa računskom armaturom za prijem smicanja. Posebno je razmatran minimalni procenat armiranja armaturom za smicanje.
PB  - Savez građevinskih inženjera Srbije, Beograd
T2  - Građevinski kalendar
T1  - Comparative analysis of diagonal tension design toward EC2 and PBAB-87
T1  - Uporedna analiza proračuna kosih glavnih napona prema EC2 i PBAB-87
IS  - 41
SP  - 128
EP  - 146
UR  - https://hdl.handle.net/21.15107/rcub_raf_59
ER  - 

@article{
author = "Okrajnov-Bajić, Ruža and Pecić, Nenad",
year = "2009",
abstract = "Design proceedings of reinforced concrete in accordance with EN 1992-1-1:2004 Eurocode 2 and with current Serbian regulations PBAB-87 are given. The difference in design and results between members not requiring design shear reinforcement and members requiring design shear reinforcement are analyzed. Minimal reinforcement ratio for shear reinforcement is particularly considered., Dati su postupci proračuna armiranobetonskih elemenata opterećenih smicanjem prema EN 1992-1-1: 2004 Evrokod 2 i prema važećem srpskom pravilniku PBAB-87. Analizirane su razlike u proračunu i dobijenim rezultatima u slučaju elemenata bez potrebne računske armature za prijem smicanja i elemenata sa računskom armaturom za prijem smicanja. Posebno je razmatran minimalni procenat armiranja armaturom za smicanje.",
publisher = "Savez građevinskih inženjera Srbije, Beograd",
journal = "Građevinski kalendar",
title = "Comparative analysis of diagonal tension design toward EC2 and PBAB-87, Uporedna analiza proračuna kosih glavnih napona prema EC2 i PBAB-87",
number = "41",
pages = "128-146",
url = "https://hdl.handle.net/21.15107/rcub_raf_59"
}

Okrajnov-Bajić, R.,& Pecić, N.. (2009). Comparative analysis of diagonal tension design toward EC2 and PBAB-87. in Građevinski kalendar
Savez građevinskih inženjera Srbije, Beograd.(41), 128-146.
https://hdl.handle.net/21.15107/rcub_raf_59

Okrajnov-Bajić R, Pecić N. Comparative analysis of diagonal tension design toward EC2 and PBAB-87. in Građevinski kalendar. 2009;(41):128-146.
https://hdl.handle.net/21.15107/rcub_raf_59 .

Okrajnov-Bajić, Ruža, Pecić, Nenad, "Comparative analysis of diagonal tension design toward EC2 and PBAB-87" in Građevinski kalendar, no. 41 (2009):128-146,
https://hdl.handle.net/21.15107/rcub_raf_59 .