TY  - JOUR
AU  - Mirković Marjanović, Milica
AU  - Kijanović, Aleksandar
AU  - Ilić, Snežana
AU  - Janković, Ksenija
AU  - Zakić, Dimitrije
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2826
AB  - The guarded hot plate (GHP) method is a widely used technique to measure
thermal conductivity of thermal insulation specimens in steady-state conditions.
In this paper, an advance of GHP has been developed in the Laboratory for
Thermal Technique and Fire Protection in Institute IMS. The innovative GHP
has been applied for measuring thermal conductivity using additional heat flux
meters. The design of this GHP is similar to the design of the plate for GHP apparatus, however, it has different design: smaller width of thermal barrier, which
is filled with insulation glue. Heaters inside hot and guard plates are built from
wire for thermocouples, which is a unique type of heater. Geometry of heater has
been optimized inside plates to achieve uniform temperature distribution along
the specimen surface. Temperature uniformity of GHP and energy balance were
experimentally determined. The verification and validation results of improved
GHP have been shown. The test method was validated comparing test results of
thermal conductivity with results of the round-robin test. Four national companies participated in the round-robin comparison on thermal conductivity measurement by GHP method. The measurement was performed on the same specimen
of thermal insulation material (expanded polystyrene) according to SRPS EN
12667 at temperatures ranging between 10-40 °C. The measured thermal conductivity of all participants in the round-robin test was input data for statistical
processing according to SRPS ISO 5725-2 and ISO 13528. To evaluate the performance of the participants, the “z” score has been used. Measurements were
conducted successively for all participants. Since 2020, the Accreditation Body of
Serbia also approved this test method.
PB  - Society of Thermal Engineers of Serbia
T2  - Thermal Science
T1  - Verification and Validation of an Advanced Guarded Hot Plate for Determination of Thermal Conductivity
EP  - 4747
IS  - 6A
SP  - 4735
VL  - 26
DO  - 10.2298/TSCI220311108M
ER  - 

@article{
author = "Mirković Marjanović, Milica and Kijanović, Aleksandar and Ilić, Snežana and Janković, Ksenija and Zakić, Dimitrije",
year = "2022",
abstract = "The guarded hot plate (GHP) method is a widely used technique to measure
thermal conductivity of thermal insulation specimens in steady-state conditions.
In this paper, an advance of GHP has been developed in the Laboratory for
Thermal Technique and Fire Protection in Institute IMS. The innovative GHP
has been applied for measuring thermal conductivity using additional heat flux
meters. The design of this GHP is similar to the design of the plate for GHP apparatus, however, it has different design: smaller width of thermal barrier, which
is filled with insulation glue. Heaters inside hot and guard plates are built from
wire for thermocouples, which is a unique type of heater. Geometry of heater has
been optimized inside plates to achieve uniform temperature distribution along
the specimen surface. Temperature uniformity of GHP and energy balance were
experimentally determined. The verification and validation results of improved
GHP have been shown. The test method was validated comparing test results of
thermal conductivity with results of the round-robin test. Four national companies participated in the round-robin comparison on thermal conductivity measurement by GHP method. The measurement was performed on the same specimen
of thermal insulation material (expanded polystyrene) according to SRPS EN
12667 at temperatures ranging between 10-40 °C. The measured thermal conductivity of all participants in the round-robin test was input data for statistical
processing according to SRPS ISO 5725-2 and ISO 13528. To evaluate the performance of the participants, the “z” score has been used. Measurements were
conducted successively for all participants. Since 2020, the Accreditation Body of
Serbia also approved this test method.",
publisher = "Society of Thermal Engineers of Serbia",
journal = "Thermal Science",
title = "Verification and Validation of an Advanced Guarded Hot Plate for Determination of Thermal Conductivity",
pages = "4747-4735",
number = "6A",
volume = "26",
doi = "10.2298/TSCI220311108M"
}

Mirković Marjanović, M., Kijanović, A., Ilić, S., Janković, K.,& Zakić, D.. (2022). Verification and Validation of an Advanced Guarded Hot Plate for Determination of Thermal Conductivity. in Thermal Science
Society of Thermal Engineers of Serbia., 26(6A), 4735-4747.
https://doi.org/10.2298/TSCI220311108M

Mirković Marjanović M, Kijanović A, Ilić S, Janković K, Zakić D. Verification and Validation of an Advanced Guarded Hot Plate for Determination of Thermal Conductivity. in Thermal Science. 2022;26(6A):4735-4747.
doi:10.2298/TSCI220311108M .

Mirković Marjanović, Milica, Kijanović, Aleksandar, Ilić, Snežana, Janković, Ksenija, Zakić, Dimitrije, "Verification and Validation of an Advanced Guarded Hot Plate for Determination of Thermal Conductivity" in Thermal Science, 26, no. 6A (2022):4735-4747,
https://doi.org/10.2298/TSCI220311108M . .

TY  - JOUR
AU  - Bojović, Dragan
AU  - Bašić, Nevena
AU  - Janković, Ksenija
AU  - Senić, Aleksandar
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2667
AB  - Čvrstoća pri pritisku jeste svojstvo koje je veoma značajno u građevinarstvu, te postoji izražena potreba da se razviju metode za praćenje prirasta čvrstoće pri pritisku betona u konstrukciji. Prema zakonskim propisima Republike Srbije, procena čvrstoće pri pritisku betona u konstrukciji radi se na osnovu rezultata dobijenih tokom laboratorijskih ispitivanja u konstantnim uslovima. U radu se koriste rezultati dobijeni u laboratoriji i porede se rezultati dobijeni pomoću metode za merenje zrelosti betona, koje se baziraju na korelaciji između čvrstoće betona, starosti betona i temperaturnih uslova i rezultata dobijenih pomoću ConReg 706 uređaja, koji takođe uzima u obzir temperaturu van betona. Primenjena su dva pristupa za određivanje zrelosti betona - Nurse & Saul i Arrhenius. Za potrebe ovog istaživanja, pripremljene su dve različite betonske mešavine - MB 35 i MB 40, obe klase C30/37. Odabrani konstrukcijski elementi betonirani su tokom leta, na mostu preko reke Save, kod Ostružnice, u blizini Beograda. Testirani elementi mosta jesu kolovozna ploča, naglavna greda i ležišna greda. Ispitivanje je pokazalo da temperatura koja se razvija u masivnim delovima konstrukcije znatno utiče na čvrstoću betona, pored već dobro poznatih faktora, kao što su vodo-cementni odnos, tip i kvalitet komponentnih materijala i drugi.
T2  - Građevinski materijali i konstrukcije
T1  - Procena čvrstoće betona pri pritisku, korišćenjem različitih funkcija zrelosti betona: primer iz prakse
T1  - Assesment of concrete compressive strength using different maturity functions: case study
EP  - 65
SP  - 55
VL  - 61
DO  - 10.5937/GRMK1803055B
ER  - 

@article{
author = "Bojović, Dragan and Bašić, Nevena and Janković, Ksenija and Senić, Aleksandar",
year = "2018",
abstract = "Čvrstoća pri pritisku jeste svojstvo koje je veoma značajno u građevinarstvu, te postoji izražena potreba da se razviju metode za praćenje prirasta čvrstoće pri pritisku betona u konstrukciji. Prema zakonskim propisima Republike Srbije, procena čvrstoće pri pritisku betona u konstrukciji radi se na osnovu rezultata dobijenih tokom laboratorijskih ispitivanja u konstantnim uslovima. U radu se koriste rezultati dobijeni u laboratoriji i porede se rezultati dobijeni pomoću metode za merenje zrelosti betona, koje se baziraju na korelaciji između čvrstoće betona, starosti betona i temperaturnih uslova i rezultata dobijenih pomoću ConReg 706 uređaja, koji takođe uzima u obzir temperaturu van betona. Primenjena su dva pristupa za određivanje zrelosti betona - Nurse & Saul i Arrhenius. Za potrebe ovog istaživanja, pripremljene su dve različite betonske mešavine - MB 35 i MB 40, obe klase C30/37. Odabrani konstrukcijski elementi betonirani su tokom leta, na mostu preko reke Save, kod Ostružnice, u blizini Beograda. Testirani elementi mosta jesu kolovozna ploča, naglavna greda i ležišna greda. Ispitivanje je pokazalo da temperatura koja se razvija u masivnim delovima konstrukcije znatno utiče na čvrstoću betona, pored već dobro poznatih faktora, kao što su vodo-cementni odnos, tip i kvalitet komponentnih materijala i drugi.",
journal = "Građevinski materijali i konstrukcije",
title = "Procena čvrstoće betona pri pritisku, korišćenjem različitih funkcija zrelosti betona: primer iz prakse, Assesment of concrete compressive strength using different maturity functions: case study",
pages = "65-55",
volume = "61",
doi = "10.5937/GRMK1803055B"
}

Bojović, D., Bašić, N., Janković, K.,& Senić, A.. (2018). Procena čvrstoće betona pri pritisku, korišćenjem različitih funkcija zrelosti betona: primer iz prakse. in Građevinski materijali i konstrukcije, 61, 55-65.
https://doi.org/10.5937/GRMK1803055B

Bojović D, Bašić N, Janković K, Senić A. Procena čvrstoće betona pri pritisku, korišćenjem različitih funkcija zrelosti betona: primer iz prakse. in Građevinski materijali i konstrukcije. 2018;61:55-65.
doi:10.5937/GRMK1803055B .

Bojović, Dragan, Bašić, Nevena, Janković, Ksenija, Senić, Aleksandar, "Procena čvrstoće betona pri pritisku, korišćenjem različitih funkcija zrelosti betona: primer iz prakse" in Građevinski materijali i konstrukcije, 61 (2018):55-65,
https://doi.org/10.5937/GRMK1803055B . .

TY  - JOUR
AU  - Bojović, Dragan
AU  - Aranđelović, Bojan
AU  - Janković, Ksenija
AU  - Senić, Aleksandar
AU  - Stojanović, Marko
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2666
AB  - Prestressing structural elements allows an increase in the spans of reinforced concrete structures. In the design and dimensioning of prestressed reinforced concrete structures it is necessary to know, that is to adopt a number of parameters which are empirically determined. Determining the level of the tension force of the cables is of primary importance for prestressed structures. The level of tensioning force, in addition to other parameters, greatly depends on the friction coefficient of cables and the imperfection coefficient of execution. These coefficients are defined by standards for the design or by the manufacturer of the prestressing system. The coefficients are defined in wide ranges, while for the design, the knowledge of the most accurate values is necessary in order to obtain a good design and cheaper structures. Through experimental work in-situ the range of the values of the coefficient of friction of cables is determined and compared with ranges defined by the standard.
T2  - Građevinski materijali i konstrukcije
T1  - Određivanje in-situ koeficijenta trenja i imperfekcije kablova za prednaprezanje
T1  - Determination of the in situ coefficient of friction and imperfection of prestressing cables
EP  - 56
SP  - 49
VL  - 60
DO  - 10.5937/grmk1702049B
ER  - 

@article{
author = "Bojović, Dragan and Aranđelović, Bojan and Janković, Ksenija and Senić, Aleksandar and Stojanović, Marko",
year = "2017",
abstract = "Prestressing structural elements allows an increase in the spans of reinforced concrete structures. In the design and dimensioning of prestressed reinforced concrete structures it is necessary to know, that is to adopt a number of parameters which are empirically determined. Determining the level of the tension force of the cables is of primary importance for prestressed structures. The level of tensioning force, in addition to other parameters, greatly depends on the friction coefficient of cables and the imperfection coefficient of execution. These coefficients are defined by standards for the design or by the manufacturer of the prestressing system. The coefficients are defined in wide ranges, while for the design, the knowledge of the most accurate values is necessary in order to obtain a good design and cheaper structures. Through experimental work in-situ the range of the values of the coefficient of friction of cables is determined and compared with ranges defined by the standard.",
journal = "Građevinski materijali i konstrukcije",
title = "Određivanje in-situ koeficijenta trenja i imperfekcije kablova za prednaprezanje, Determination of the in situ coefficient of friction and imperfection of prestressing cables",
pages = "56-49",
volume = "60",
doi = "10.5937/grmk1702049B"
}

Bojović, D., Aranđelović, B., Janković, K., Senić, A.,& Stojanović, M.. (2017). Određivanje in-situ koeficijenta trenja i imperfekcije kablova za prednaprezanje. in Građevinski materijali i konstrukcije, 60, 49-56.
https://doi.org/10.5937/grmk1702049B

Bojović D, Aranđelović B, Janković K, Senić A, Stojanović M. Određivanje in-situ koeficijenta trenja i imperfekcije kablova za prednaprezanje. in Građevinski materijali i konstrukcije. 2017;60:49-56.
doi:10.5937/grmk1702049B .

Bojović, Dragan, Aranđelović, Bojan, Janković, Ksenija, Senić, Aleksandar, Stojanović, Marko, "Određivanje in-situ koeficijenta trenja i imperfekcije kablova za prednaprezanje" in Građevinski materijali i konstrukcije, 60 (2017):49-56,
https://doi.org/10.5937/grmk1702049B . .