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Abdullha, K. A., Abdullha, A. I., Abdul-Razzak, A. A. & Al-Gburi, M. (2024). Mechanical properties, thermal and chemical effect of polymer cotton bars reinforced with carbon / glass fiber. Australian Journal of Mechanical Engineering, 22(3), 592-602
Open this publication in new window or tab >>Mechanical properties, thermal and chemical effect of polymer cotton bars reinforced with carbon / glass fiber
2024 (English)In: Australian Journal of Mechanical Engineering, ISSN 1448-4846, Vol. 22, no 3, p. 592-602Article in journal (Refereed) Published
Abstract [en]

Many researchers are interested in using natural fibres to treat due to recent advancements in polymer characteristics. The mechanical properties of three types of bars are studied in this paper: Cotton Fibre-Reinforced Polymer bars, Cotton/Carbon Fibre-Reinforced Polymer bars, and Cotton/Glass Fibre-Reinforced Polymer bars. The goal of the paper was to create low-cost bars with comparable mechanical performance and corrosion resistance to steel reinforcement. The bars were made using two methods: fibres immersed in polymer and fibres coated with polymer by repeated tension and relaxation of fibres. The second method produced better results in terms of the tensile strength of Cot.CFRP, Cot.GFRP, and Cot.FRP bars, which were 688, 477, and 284 MPa, respectively, and the stress–strain curve revealed brittle behaviour for all bars and modulus of elasticity of 43, 31 and 22 GPa. When sand was put on the bar’s surface, the bars demonstrated a good connection with the concrete. It also showed good resistance to moisture, alkaline solutions and acids, as well as heat resistance at temperatures below 200°C.

Place, publisher, year, edition, pages
Taylor & Francis, 2024
Keywords
Cot.Cfrp (Cotton/carbon Fiber-Reinforced polymer), Cot.Frp (cotton fiber-reinforced polymer), Cot.Gfrp (cotton/glass fiber-reinforced polymer), cotton fibre, mechanical properties, natural fibre
National Category
Other Physics Topics Environmental Analysis and Construction Information Technology
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-93243 (URN)10.1080/14484846.2022.2125472 (DOI)000860043800001 ()2-s2.0-85139091834 (Scopus ID)
Funder
Luleå University of Technology
Note

Validerad;2024;Nivå 1;2024-06-27 (hanlid);

Full text license: CC BY-NC-ND

Available from: 2022-09-26 Created: 2022-09-26 Last updated: 2024-06-27Bibliographically approved
Abbu, M., Al-Attar, A. A., Abd Alrahman, S. & Al-Gburi, M. (2023). The mechanical properties of lightweight (volcanic pumice) concrete containing fibers with exposure to high temperatures. Journal of the Mechanical Behavior of Materials, 32(1), Article ID 20220249.
Open this publication in new window or tab >>The mechanical properties of lightweight (volcanic pumice) concrete containing fibers with exposure to high temperatures
2023 (English)In: Journal of the Mechanical Behavior of Materials, ISSN 2191-0243, Vol. 32, no 1, article id 20220249Article in journal (Refereed) Published
Abstract [en]

Fires are considered one of the main risks leading to building collapse. Lightweight concrete comprises a variety of components, each of which has a distinct behavior under the effect of temperature change. A total of sixteen concrete mixtures were investigated in this paper. A reference mix of concrete comprising simply ordinary Portland cement and ten mixes having varying percentages of fine and coarse lightweight aggregates (pumice), which were replaced gravel and sand by fine pumice and coarse aggregates pumice by 20%, 40%, 60%, 80%, and 100%, respectively. In addition, the study focused on the effects of adding fibers to lightweight aggregate concrete mixtures. Polypropylene fibers, carbon fibers, and steel fibers were employed as fiber additions. The binary mixture had higher density than the remaining mixtures containing one substitute. The behavior of six concrete mixes in addition to the reference mix of ordinary concrete after exposure to temperatures 100, 250, 350 and 450 °C for two hours and then cooled in two ways (water and air) as well as examined directly and the results showed that the concrete mixes containing fiber better behavior compared to other mixtures, especially at high temperature. If left to cool in the air, the lightweight concrete containing Volcanic Pumice can recover its compression strength after being exposed to high temperatures.

Place, publisher, year, edition, pages
Walter de Gruyter, 2023
Keywords
Lightweight concrete, pumice, Fibers, Elevated temperatures
National Category
Building Technologies
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-92663 (URN)10.1515/jmbm-2022-0249 (DOI)000898553400001 ()2-s2.0-85144141619 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-02-21 (hanlid)

Available from: 2022-08-25 Created: 2022-08-25 Last updated: 2024-04-09Bibliographically approved
Hadeed, M., Humad, A. M. & Al-Gburi, M. (2023). Utilization of hybrid fibers in different types of concrete and their activity. Journal of the Mechanical Behavior of Materials, 32(1), Article ID 20220262.
Open this publication in new window or tab >>Utilization of hybrid fibers in different types of concrete and their activity
2023 (English)In: Journal of the Mechanical Behavior of Materials, ISSN 2191-0243, Vol. 32, no 1, article id 20220262Article in journal (Refereed) Published
Abstract [en]

In this work, the influence of using hybrid fibers on the mechanical properties of two types of concrete: high-strength concrete (HSC) and light-weight concrete (WLC) was studied. Using hybrid fibers instead of using only one type, reduced the negative effect on concrete mechanical performance. The glass (GF) and polypropylene fibers (PPF) were used in different contents ranged from 0.2% to 1% as weight % of binder content. Moreover, combinations of both fibers "GF+PPF" were used in contents % of "0.3+0.5"%, "0.5+0.5"%, "0.3+1"%, and "0.5+1"%. Light weight concrete (LWC) mixes were prepared by replacing 40% of the coarse aggregate of reference mix with volcanic material (pumice) as a volumetric replacing. To produce high-strength concrete, w/c ratio was reduced to 0.3, 10% silica fume was added and 1% super plasticizer was used to obtain the consistency. Compressive strength, splitting strength, and flexural strength tests were carried out. The results showed that using 0.7% glass fibers (GF) displayed the highest increases in compressive, splitting tensile, and flexural strength of HSC and LWC mixes. Furthermore, glass fibers GF exhibited better performance and higher values in compressive, splitting tensile, and flexural strength tests in comparison with polypropylene fibers. The optimum hybrid fibers content which displayed the highest increment of all tested properties in both concrete types: HSC and LWC was "0.5% GF+0.5% PPF".

Place, publisher, year, edition, pages
Walter de Gruyter, 2023
Keywords
hybrid fibers, mechanical properties, concrete mixes
National Category
Building Technologies Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-94875 (URN)10.1515/jmbm-2022-0262 (DOI)000925126500001 ()2-s2.0-85147701771 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-02-21 (hanlid)

Available from: 2022-12-16 Created: 2022-12-16 Last updated: 2023-05-08Bibliographically approved
Owaid, H. M., Humad, A. M., Al-Gburi, M., Ghali, Z. A. & Sas, G. (2023). Utilization of nanoparticles and waste materials in cement mortars. Journal of the Mechanical Behavior of Materials, 32(1), Article ID 20220289.
Open this publication in new window or tab >>Utilization of nanoparticles and waste materials in cement mortars
Show others...
2023 (English)In: Journal of the Mechanical Behavior of Materials, ISSN 0334-8938, Vol. 32, no 1, article id 20220289Article in journal (Refereed) Published
Abstract [en]

Cement has shaped the modern built environment, but its production generates substantial carbon dioxide emissions. Consequently, there is an urgent need to identify alternative cementitious building materials for sustainable construction. In this study, cement mortars (CMs) were produced by partially replacing cement with nanoclay (NC) and granite dust (GD). The replacement proportions (% by weight of cement) of these materials were 1.5, 3, and 4.5% for NC and 10, 20, and 30% for GD. For mortars containing NC but not GD, the strength was maximized when the NC replacement proportion was 3%. To evaluate the combined effect of partially replacing cement with both NC and GD on the fresh and hardening properties of cement-blended mortars, ternary binder mixtures containing 3% NC together with 10, 20, or 30% GD were prepared, and their workability, bulk density, compressive strength (at 7, 28, and 90 days), and flexural strength were measured. Increasing the content of NC and/or GD reduced the flowability of these mortars relative to that of the reference mortar mix because it increased the content of fine materials. CM containing 3% NC and 10% GD had the highest compressive strength at 7, 28, and 90 days while also having the greatest flexural strength when compared to the control mix. This is most likely due to the high silica and alumina content of NC and GD, as well as their high specific surface area, which would improve the maturity and density of the matrix when compared to cement alone.

Place, publisher, year, edition, pages
Walter de Gruyter, 2023
Keywords
nano-clay, nanoparticles, granite dust, cement mortar, partial replacement
National Category
Other Materials Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-101623 (URN)10.1515/jmbm-2022-0289 (DOI)001069531200001 ()
Note

Validerad;2023;Nivå 2;2023-10-11 (joosat);

CC BY 4.0 License

Available from: 2023-10-11 Created: 2023-10-11 Last updated: 2023-10-11Bibliographically approved
Ibrahim, M. K., Gügös, M. T., Abbu, M. & Al-Gburi, M. (2022). 3D FE modeling of cable-stayed bridge according to ICE code. Open Engineering, 12(1), 1126-1133
Open this publication in new window or tab >>3D FE modeling of cable-stayed bridge according to ICE code
2022 (English)In: Open Engineering, E-ISSN 2391-5439, Vol. 12, no 1, p. 1126-1133Article in journal (Refereed) Published
Abstract [en]

This paper presents the performance of a cable-stayed bridge by representing a model using the ANSYS program under the influence of a concentrated load and then comparing the results with the experimental results. One model used in the analysis was the Harp type 1, which used the length of the girder (4500mm), the height of the pylon (1480mm), and the depth of the flange on the girder (40mm). If cable-stayed bridges are constructed using the balanced cantilever method, the stability problem of the girder is more significant during the construction stage than at the initial state. In this study, to investigate the ultimate behavior of cable-stayed bridges, experimental and analytical studies were conducted for one model: Harp Type 1. At the limit state, several plastic hinges occurred, and the girders buckle along the entire span. Numerical analysis was conducted for the experimental model, the results of which showed good agreement with the experimental results. The influence of such effects on the analysis and the structural role of cable-stayed bridges has been detailed and examined in the study. The dimensions of the model were also compared with the ICE Code in terms of the height of the tower to the main space, and the back span to the main span ratio. It was close to standard specifications. A finite element procedure for the nonlinear analysis of cable-stayed bridges first set up and then detailed for the static deflection analysis of such bridges is carried out.

Place, publisher, year, edition, pages
Walter de Gruyter, 2022
Keywords
FE modelling, cable-stayed bridge, ICE code
National Category
Other Civil Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-94874 (URN)10.1515/eng-2022-0396 (DOI)000935054100001 ()2-s2.0-85148244425 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-03-03 (hanlid)

Available from: 2022-12-16 Created: 2022-12-16 Last updated: 2024-07-12Bibliographically approved
Al-Gburi, M. & Yusuf, S. A. (2022). Investigate the effect of mineral additives on concrete strength using ANN. Asian Journal of Civil Engineering, 23(3), 405-414
Open this publication in new window or tab >>Investigate the effect of mineral additives on concrete strength using ANN
2022 (English)In: Asian Journal of Civil Engineering, ISSN 1563-0854, Vol. 23, no 3, p. 405-414Article in journal (Refereed) Published
Abstract [en]

In addition to cement, sand, gravel, and water, the current investigation of the influence ofadditives on the compressive strength of concrete at 28 days includes fly ash, silica fume, andslag. 315 concrete compositions with various amounts of additives are trained and tested using anartificial neural network. Concrete strength is largely affected by the specific gravity of cementand the specific gravity of fine and coarse particles, according to the studies. For greatercompressive strength, it is preferable to use materials with a higher specific gravity. Compressivestrength has grown as the amount of silica fumes has increased. Increased amounts of slag orsuper-plasticizer resulted in the same behavior. When the amount of fly ash was increased, thecompressive strength of the material decreased.

Place, publisher, year, edition, pages
Springer Nature, 2022
Keywords
Specific Gravity, Mix Design, Mineral Additives, ANN
National Category
Building Technologies
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-89373 (URN)10.1007/s42107-022-00431-1 (DOI)2-s2.0-85126090172 (Scopus ID)
Note

Validerad;2022;Nivå 1;2022-04-19 (johcin)

Available from: 2022-02-22 Created: 2022-02-22 Last updated: 2022-04-19Bibliographically approved
Al-Gburi, M., Gonzalez-Libreros, J., Sas, G. & Nilsson, M. (2022). Quantifying the Environmental Impact of Railway Bridges Using Life Cycle Assessment: A Case Study. In: IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures - Report: . Paper presented at IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures, Prague, Czech Republic, May 25-27, 2022. International Association for Bridge and Structural Engineering
Open this publication in new window or tab >>Quantifying the Environmental Impact of Railway Bridges Using Life Cycle Assessment: A Case Study
2022 (English)In: IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures - Report, International Association for Bridge and Structural Engineering, 2022Conference paper, Published paper (Refereed)
Abstract [en]

As emission regulations in the EU are becoming stricter, the reduction of greenhouse gas emissions from the construction industry has become a pressing need. As part of the efforts related to this issue, it has been found that Environmental Life Cycle Analysis (LCA) approaches are required to optimize the design, construction, operation, and maintenance of buildings and infrastructure assets. In this paper, The Institution of Structural Engineers guidance on how to calculate the embodied carbon in structures is used as LCA model and evaluated in a case study. The guidance divides the structure´s life cycle into five stages (A1-A3: Product, A4-A5: Construction process, B1-B7: Use, C1-C4: End of live and D: Benefits and loads beyond the system boundary) and the environmental impact is measured in terms of carbon dioxide equivalent emissions (kgCo2e) or global warming potential (GWP). The model was applied to an existing reinforced concrete trough bridge, which is a structure type commonly used in Swedish railways. Results show that that the model was effective and simple for investigating the environmental impact of the studied structure. 

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering, 2022
Keywords
Life cycle analysis, Reinforced concrete, Railway Bridge, Embodied carbon, Global warming potentia
National Category
Other Civil Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-91104 (URN)2-s2.0-85133522166 (Scopus ID)
Conference
IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures, Prague, Czech Republic, May 25-27, 2022
Available from: 2022-06-09 Created: 2022-06-09 Last updated: 2023-09-05Bibliographically approved
Al-Gburi, M., Jonasson, J.-E. & Nilsson, M. (2022). Reducing Thermal Crack Risks Caused by Restraint in Young Concrete - A Case Study on Walls of Water Tanks. Nordic Concrete Research, 66(1), 41-54
Open this publication in new window or tab >>Reducing Thermal Crack Risks Caused by Restraint in Young Concrete - A Case Study on Walls of Water Tanks
2022 (English)In: Nordic Concrete Research, ISSN 0800-6377, Vol. 66, no 1, p. 41-54Article in journal (Refereed) Published
Abstract [en]

Concrete cracks in structures such as water tanks and nuclear power stations cause anxiety to owners, contractors and engineers. These cracks may significantly increase the structure’s permeability and thus increase leakage, reduce durability, and eventually lead to loss of structural functionality. Therefore it is important to minimize their occurrence and size. To identify effective ways of minimizing cracking in young concrete segments, a parametric study was conducted using the finite element method (FEM). Parameters considered include casting sequence, joint position, wall height, and cooling. The study examined continuous and jumped casting approaches to the casting of a cylindrical reinforced concrete tank for a sewage-treatment plant, with and without the application of the ‘kicker’ technique in which the lower part of the wall is cast with the slab. The main cause of cracking is thermal change and restraint imposed by adjacent older structures, and the FEM predictions agree well with experimental observations. Continuous casting is most effective at minimizing cracking because it creates only two contact edges between newly cast and existing structures producing the lowest level of restraint. The kicker technique is shown to be very effective for reducing restraint and consider rephasing.

Place, publisher, year, edition, pages
Walter de Gruyter, 2022
National Category
Manufacturing, Surface and Joining Technology Construction Management
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-92219 (URN)10.2478/ncr-2022-0001 (DOI)000825200600004 ()
Note

Validerad;2022;Nivå 2;2022-07-21 (sofila)

Available from: 2022-07-22 Created: 2022-07-22 Last updated: 2023-09-05Bibliographically approved
Al-Gburi, M., Jonasson, J.-E. & Nilsson, M. (2018). Prediction of Restraint in Second Cast Sections of Concrete Culverts using Artificial Neural Networks (ed.). European Journal of Environmental and Civil Engineering, 22(2), 226-245
Open this publication in new window or tab >>Prediction of Restraint in Second Cast Sections of Concrete Culverts using Artificial Neural Networks
2018 (English)In: European Journal of Environmental and Civil Engineering, ISSN 1964-8189, E-ISSN 2116-7214, Vol. 22, no 2, p. 226-245Article in journal (Refereed) Published
Abstract [en]

Estimation of restraint is very important for accurately predicting the risk of early thermal and shrinkage cracking in concrete structures. The stress in young concrete is affected by changes in its dimensions during hydration and the restraint imposed by adjoining structures. In concrete culverts, the restraints from existing structures acting upon the first and second casting sections to be cast are different, causing them to exhibit different early cracking behaviour. This work presents a new method for predicting restraint in complex concrete structures using artificial neural networks (ANNs). Finite element calculations were performed to predict restraint in 108 slabs, 324 walls and 972 roofs from second sections of concrete culverts, and the results obtained were used to train and validate ANN models. The ANN models were then used to study the effects of varying selected parameters (the thickness and width of the roof and slab, the thickness and height of the walls, and the length of the culvert section) on the predicted restraint. Mathematical expressions for predicting restraint values in slabs, walls and roofs were derived based on the ANN models’ output and implemented in an Excel spreadsheet that provides a simple way of predicting restraint in practical applications. Restraint values predicted in this way agree well with the results of finite-element calculations

Place, publisher, year, edition, pages
Taylor & Francis, 2018
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-13947 (URN)10.1080/19648189.2016.1186116 (DOI)000427321300006 ()2-s2.0-84969262827 (Scopus ID)d43d84f0-c1d2-4a54-9629-77677abf0d2c (Local ID)d43d84f0-c1d2-4a54-9629-77677abf0d2c (Archive number)d43d84f0-c1d2-4a54-9629-77677abf0d2c (OAI)
Note

Validerad;2017;Nivå 2;2017-12-04 (svasva)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-05Bibliographically approved
Al-Gburi, M., Jonasson, J.-E. & Nilsson, M. (2016). Reduction of Early Age Crack Risks in Concrete Walls by Using a New Casting Technique (ed.). Structural Engineering International, 26(3), 216-224
Open this publication in new window or tab >>Reduction of Early Age Crack Risks in Concrete Walls by Using a New Casting Technique
2016 (English)In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 26, no 3, p. 216-224Article in journal (Refereed) Published
Abstract [en]

Volumetric changes in early age concrete that are restrained might lead to cracks. The degree of restraint is influenced by the casting sequence and the dimensions of the castings. In the current study a new casting technique is proposed to reduce restraint in the newly cast concrete with a new arrangement of the structural joint to the existing old concrete. The proposed technique is valid for the typical structure wall-on-slab using one structural joint. This casting method means that lower part of the wall is cast together with the slab, and that part is called a kicker. Hereby, the behavior of the structure changes from a typical case wall-on-slab to a typical case wall-on-wall. It has been proven by the beam theory and demonstrated by numerical calculations that there is a clear reduction in the restraint from the slab to the wall using kickers. In the paper different kicker heights are studied with the aim of determining the minimum restraint in the upper part of the wall cast in contact with the kicker. The technique using kickers is compared with common measures used in the field to avoid cracking, such as cooling pipes in the new casting and/or heating cables in the adjoining old concrete. The presented method is both cost and time effective, as it opens the possibility to use larger structural length of each casting sequence.

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering, 2016
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-9105 (URN)10.2749/101686616X14555429843960 (DOI)000386695500004 ()2-s2.0-85021095055 (Scopus ID)7ac04418-9d63-4c95-b719-af26f19330d0 (Local ID)7ac04418-9d63-4c95-b719-af26f19330d0 (Archive number)7ac04418-9d63-4c95-b719-af26f19330d0 (OAI)
Note

Validerad; 2016; Nivå 2; 2016-11-25 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-05Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9987-0174

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