Search

Your search keyword '"Alzeebaree, Radhwan"' showing total 40 results
Start Over Author "Alzeebaree, Radhwan"
40 results on '"Alzeebaree, Radhwan"'

10. The effect of materials and curing system on the behavior of self-compacting geopolymer concrete

Author

Al-Bayati Maan A., Abdulrahman Mazin B., Alzeebaree Radhwan, and Arbili Mohamed M.

Subjects
self-compacting geopolymer concrete, curing condition, binder materials, Mechanical engineering and machinery, TJ1-1570
Abstract

The aim of the present work was to investigate and achieve the optimum compressive strength of self-compacting geopolymer concrete (SCGC). Fly ash (FA) and ground granulated blast furnace slag (GGBFS) are used at different ratios as binder materials to produce the SCGC mixes. Alkaline solution was a mix of sodium silicate and sodium hydroxide. Three different ratios of binder materials were used to produce SCGC (0FA-100GGBFS; 50FA-50GGBFS; and 100FA-0GGBFS). The total binder weight was 500 kg/m3 within a constant alkali–binder proportion (0.5). Two curing conditions were used, at ambient environment and heat curing at 110°C for 24 h. The compressive strength and fresh properties of SCGC are evaluated. The compressive strength is utilized to demonstrate the mechanical properties of SCGC. The compressive strength is investigated at two ages (7 and 28 days). The results showed that the use of GGBFS had a negative effect on the fresh properties of SCGC. However, it has a significant impact on the mechanical behavior of the SCGC. SCGC’s early strength is heavily involved in heat curing. The compressive strength of 100% GGBFS in the ambient environment after 28 days was more than that of GGBFS cured at 110°C. The optimum eco-friendly mix is 50FA-50GGBFS.

Published
2022
Full Text
View/download PDF

15. Using polymers to improve asphalt pavement performance, A review.

Author

Hasan, Jiman N., Alzeebaree, Radhwan, and Hussein, Nasreen A.

Subjects
*ASPHALT pavements, *POLYVINYL chloride, *FATIGUE limit, *POLYMERS, *ROAD construction, *MELTING points
Abstract

Pavement structures are subjected to high traffic loads, which deteriorates the pavement over time. In recent years, various techniques for improving the performance of asphalt pavements have gained popularity. One of these technologies is polymer-modified-binders (PMB) in asphalt mixtures, which are gaining popularity due to reduction in thermal susceptibility and increase in fatigue and rutting resistance. As a result, this paper provides a relative assessment of the recycled polymers utmost recently addressed as bitumen modifiers to enable their selection and cover the utilization of bitumen. The melting point of the polymer, the mixing environments, and the maximum amount of polymer supplemented are all studied. Their influences on the mechanical performance and constancy of asphalt binders in the pavement with and without additives are also discussed. Polymer modification has a major consequence on the rheological characteristics of asphalt binder, according to the findings. The findings of this paper will be useful to the local road construction industry in determining the properties of locally available asphalts and modified versions. A case study of the performance of 3 polymer forms in asphalt paving mixtures is provided; namely Polystyrene-Polymer, Polyvinyl-chloride (PVC), and Phenol-resin. These modified asphalt mixtures were made with asphalt cement that had been modified previously with 2%, 4%, and 6% with weight of asphalt polymer. The effect of polymer modification on mix performance was investigated utilizing Retained Stability Tests (RST) and Indirect Tensile Strength (ITS). Two separate measuring temperatures (25°C and 45°C) are used to evaluate the behavior of the mixture due to the change in the temperature. According to the findings of a case study, using a small percentage of polystyrene polymer lead to an increase in tensile strength, permitting polystyrene modified asphalt mixtures to be used in cold climates. The test results also revealed that offering phenol resin in modified asphalt mixes can increase deformation resistance and strength, allowing it to be used in hot climates. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

16. The influence of horizontal curve on traffic crashes: A review.

Author

Khawaja, Bakhtiyar Q., Muhmood, Abdulbasit Abdulaziz, Alzeebaree, Radhwan, and Mohammedameen, Alaa

Subjects
TRAFFIC accidents, TRAFFIC fatalities, SURFACE preparation, ROAD safety measures, SURFACE states
Abstract

Due to the catastrophic ramifications of road accidents on nations' socioeconomic and human lives, the issue of traffic accidents has attracted worldwide attention. Horizontal curves are associated with an extremely high frequency of severe accidents. Several recommendations hav e been made to reduce traffic accidents and fatalities on horizontal curves. Crash statistics show that horizontal curves are the most probable of accidents. The desired state of the pavement surface is one strategy for preventing major accidents on horizontal curves. Understanding the factors that contribute to traffic accidents is an important aspect of road safety research. This study presents a review of the influence of horizontal curves on traffic crashes. Several factors, including speed, congestion, and road horizontal curvature, were discovered to have mixed effects on road safety and need additional investigation. In Erbil, Iraq, roughly 80% of the fatalities and injuries were male, while just around 20% of the fatalities were female. The crash modification factors (CMF) developed in this study may be utilized to evaluate the safety performance of an interest curve and the potential safety benefit of installing a high friction surface treatment. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

18. Fire Resistance Performance of Fiber Reinforced Geopolymer Concrete: Review

Author

Alzeebaree Radhwan, Mawlod Arass Omer, Amen Dillshad K., Younis Khaleel H., and Mohammedameen Alaa

Subjects
geopolymers, fiber reinforcement, fire resistance, binder materials of geopolymer concrete, Environmental sciences, GE1-350
Abstract

Geopolymer is a relatively new substance that has sparked a surge of research into nearly every field of geopolymers in recent years. It's still on the verge of becoming a competitive OPC concrete alternative. Mechanical, hardness, and fire resistance properties of geopolymer are exceptional. There has been no/limited research on the effect of fiber integration on fire resistance of geopolymer concrete. In fire-exposed concrete, fiber can help to resist spalling. The goal of this study is to develop materials that exhibit eco-friendly properties and better fire-resistant behavior. Moreover, the combined effect of binder materials and different fibers on the fire resistance of geopolymer concretes. According to the findings, the fire resistance of fiber-reinforced geopolymer concretes increased in the order of carbon fiber-based GPC, micro-steel fiber-based GPC, hooked steel fiber-based GPC, and polypropylene fiber-based GPC. Furthermore, as compared to slag and metakaolin-based GPC, fly ash-based GPC has greater stability and fire resistance. Fiber-reinforced GPC can also be used as a sustainable and durable building material in various construction applications where high performance is needed.

Published
2021
Full Text
View/download PDF

25. Utilization waste granulated blast furnace slag to improve the properties of polluted soil with crude oil.

Author

Arbili, Mohamed Moafak, Qaidi, Shaker M. A., Ghaffoori, Farman Khalil, Alzeebaree, Radhwan, and Awlla, Halmat Ahmed

Subjects
WASTE recycling, PETROLEUM, INDUSTRIAL wastes, CLAY soils, WASTE products, SHEAR strength of soils, SOILS
Abstract

Utilization of waste materials in the treatment of challenging polluted soils is a cost-effective and environmentally responsible strategy, as it helps to reduce disposal issues created by diverse industrial wastes. The aim of this research is to utilize waste material Ground Granulated Blast Furnace Slag (GGBFS) to enhance several engineering characteristics of polluted soil with crude oil. The engineering characteristics of clean and polluted soils with crude oil were investigated and compared to controls. Three percentages of crude oil 3%, 6%, and 9% were artificially mixed with clayey soils by weight. The effects of Ground Granulated Blast Furnace Slag on the compaction properties (OMC and MDD) and shear strength characteristics (cohesion and angle of friction) of the soil were studied. Different percentages of GGBFS (12%, and 18%) by dry weight were utilized in mixtures of soil samples for different experiments. Ultimately, bases on the experimental results, it is summarized that the use of industrial wastes, i.e. GGBFS are affected in shear strength and compaction properties. Although, they have environment-friendly behavior for the construction project purpose. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

37. The Effects of Recycled Tire Rubbers and Steel Fibers on the Performance of Self-compacting Alkali Activated Concrete.

Author

Eren, Necip Altay, Alzeebaree, Radhwan, Çevik, Abdulkadir, Niş, Anıl, Mohammedameen, Alaa, and Gülşan, Mehmet Eren

Subjects
*SELF-consolidating concrete, *RUBBER, *CRUMB rubber, *FIBERS, *TIRES, *CONCRETE, *STEEL, *EARTHQUAKE zones
Abstract

In this study, the effects of recycled tire rubbers (RTR) and steel fiber (SF) on the fresh and hardened state properties of the selfcompacted alkali activated concrete (SCAAC) were investigated. The ground granulated blast furnace slag, 1 % hooked-end SF, and two types of RTR were utilized. The crumb rubbers (CR) and tire rubber chips (TCR) were used as a substation to natural aggregates at substation levels of 10 % and 15 %. The fresh state performances were evaluated by T50 value, slump flow, V-funnel, and L-Box tests, while mechanical performances were assessed through compressive, flexural, and splitting tensile strength tests. Also, detailed crack and microstructural analyses were conducted. The RTR adversely affected the fresh state properties, which reduced more with SF inclusions. Among the RTR, the TR specimens exhibited lower fresh state performance than the CR specimens. Similar mechanical strengths were obtained on the TR and CR specimens under the same replacement ratios. However, TR specimens exhibited higher deformation capacities than the CR specimens, when SF was utilized. The SCAAC specimens with 1 % SF and 15 % RTR showed more and wider flexural cracks, higher mechanical strength, and deformation capacity, which can be utilized in structural applications, particularly in high seismic zones. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

38. Mechanıcal performance and durabılıty of confıned and unconfıned geopolymer concrete exposed to severe envıronments

Author

Alzeebaree, Radhwan Haji Ali, Çevik, Abdulkadir, Gülşan, Mehmet Eren, and İnşaat Mühendisliği Anabilim Dalı

Subjects
İnşaat Mühendisliği, Civil Engineering
Abstract

Bu çalışma, kimyasal atağa maruz kalmış sargısız/sargılı sürdürülebilir geopolimer betonun mekanik özelliklerini ve durabilitesini sunmaktadır. Tezin amacını başarabilmek için statik ve döngüsel yükleme testleri gerçekleştirilmiştir. Geopolimer betonu üretmek için düşük kalsiyumlu uçucu kül (F sınıfı) sodyum silikat ve sodyum hidroksitin kombinasyonu vasıtası ile nano-silika ile birleştirilerek etkin hale getirilmiştir. Aynı zamanda kıyaslama amacı ile sargısız/sargılı klasik Portland çimentolu beton üretilmiştir. Sargılı geopolimer/Portland çimentolu beton numuneleri bazalt/karbon lif takviyeli polimer kumaşlar ile bir/üç katman olarak sargılanmışlardır. Sargı katmanlarının türü ve sayısının, sargılama ve test zamanlarıyla birlikte, sargılı geopolimer/Portland çimentolu betonun mekanik özellikleri ve durabilitesi üzerindeki etkileri araştırılmıştır. Ayrıca, sargısız/sargılı geopolimer beton numulerinin mikro yapısı Portland çimentolu betonun mikro yapısıyla karşılaştırılmıştır. Sonuçlar, bazalt/karbon lif katkılı kumaş ile sargılamanın kimyasal atağa maruz kalmış geopolimer betonun mukavemetini, sünekliğini ve durabilitesini arttırdığını göstermiştir. Karbon lif takviyeli kumaşlarla sargılanan geopolimer beton numunelerinin bazalt lif takviyeli kumaşlarda sargılanankilere göre daha sünek ve daha dayanıklı olduğu tespit edilmiştir. Daha da ilerisi, sargısız/sargılı geopolimer beton numuneleri aynı uygulamalara maruz kalan sargısız/sargılı Portland çimentolu beton numunelerine göre daha dayanıklıdır. This study reports the mechanical properties and durability of unconfined/confined sustainable geopolymer concrete (GPC) exposed to chemical attack under static and cyclic loadings. A low calcium (Class F) fly ash incorporating nano-silica was activated by a combination of sodium silicate and sodium hydroxide solutions to make the GPC. Unconfined/confined ordinary Portland cement concrete (NC) counterparts were also made for comparison purposes. The confined GPC/NC specimens were wrapped by one/three layers of basalt/carbon fiber-reinforced polymers (BFRP/CFRP). Effects of type and number of wrapping layers, along with wrapping and testing ages on the mechanical properties and durability of confined GPC/NC were investigated. In addition, microstructure of the unconfined/confined GPC specimens was compared with that of the unconfined NC counterparts. The results showed confinement of the GPC with BFRP/CFRP fabrics enhanced the strength, ductility and durability of the GPC specimens exposed to chemical attack. The GPC specimens confined with CFRP fabric were found more ductile and durable than specimens confined by BFRP fabric. In addition, the GPC specimens confined with three layers of FRP fabrics were found more ductile and durable than that of the specimens confined with only one-layer. Further, the unconfined/confined GPC specimens were more durable than the corresponding unconfined/confined NC. 206

Published
2018

39. Mechanical performance of FRP-confined geopolymer concrete under seawater attack.

Author

Alzeebaree, Radhwan, Cxevik, Abdulkadir, Mohammedameen, Alaa, Nisş, Anıl, and Gülşan, Mehmet Eren

Subjects
*CONCRETE, *OFFSHORE structures, *CONSTRUCTION materials, *SCANNING electron microscopes, *CARBON fibers, *SEAWATER
Abstract

In the study, mechanical properties and durability performance of confined/unconfined geopolymer concrete and ordinary concrete specimens were investigated under ambient and seawater environments. Some of the specimens were confined by carbon fiber and basalt fiber--reinforced polymer fabric materials with one layer and three layers under chloride and ambient environments to observe mechanical strength contribution and durability performances of these hybrid types of materials. These fiber-reinforced polymer fabric materials were also evaluated in terms of retrofit purposes especially in the marine structures. In addition, microstructural evaluation is also conducted using scanning electron microscope on geopolymer concrete and ordinary concrete specimens to observe the amount of deterioration in microscale due to the chloride attacks. Results indicated that confined specimens exhibited enhanced strength, ductility, and durability properties than unconfined specimens, and the degree of the enhancement depended on the fiber-reinforced polymer confinement type and the number of fiber-reinforced polymer layer. Specimens confined by carbon fabrics with three layers showed superior mechanical properties and durability performance against chloride attack, while specimens confined by basalt fabrics with one layer exhibited low performance, and unconfined specimens showed the worst performance. Both fiber-reinforced polymer fabric materials can be utilized as retrofit materials in structural elements against chloride attacks. The results also pointed out that seawater attack reduced the ductility performance of the geopolymer concrete and ordinary concrete specimens. Furthermore, geopolymer concrete specimens were found more durable than the ordinary concrete specimens, and both types of concretes exhibited similar fracture properties, indicating that geopolymer concrete can be utilized for structural elements instead of ordinary concretes. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

40. Effect of silica fume and steel fiber on the mechnical properties of the conceretes produced with cold bonded fly ash aggregates

Author

Alzeebaree, Radhwan Hajy Ali, Gesoğlu, Mehmet, and İnşaat Mühendisliği Anabilim Dalı

Subjects
İnşaat Mühendisliği, Civil Engineering
Abstract

SİLİS DUMANI VE ÇELİK LİFİN SOĞUK BAĞLAMA YÖNTEMİYLE ÜRETİLMİŞ UÇUCU KÜL AGREGASI İÇERENBETONLARIN MEKANİK ÖZELLİKLERİNE ETKİSİALZEEBAREE, RadhwanYüksek Lisans Tezi, İnşaat MühendisliğiDanışman: Doç. Dr. MEHMET GESOĞLUTamoz 2012, 102 SayfaBu çalışmada, soğuk bağlama yöntemiyle üretilen yapay uçucu kül agregaları içeren yalın ve silis dumanlı çelik lif katkılı betonların mekanik özellikleri deneysel olarak incelenmiştir. Su bağlayıcı oranları 0,35 ve 0,55 olan iki beton serisi tasarlanmıştır. Silis dumanı, çimentonun ağırlığının %10'uyla yer değiştirilerek kullanılmıştır. Boy/narinlik oranı 60/80 ve 30/40 olan iki farklı tip kanca uçlu çelik tel kullanılmıştır. Bütün beton karışımlarında, %90'ı F sınıfı uçucu kül ve %10'u Portland çimentosu olan soğuk bağlı peletleme yöntemiyle üretilmiş yapay uçucu kül agregaları, kaba agrega olarak kullanıldı. Betonun mekanik özellikleri basınç dayanımı, yarmada çekme dayanımı, eğilmede çekme dayanımı ve donatı-beton arasındaki aderans dayanımı bakımından irdelenmiştir. Deneyler 28 günlük kür süresi sonunda gerçekleştirilmiştir. Deney sonuçlarınützerinde varyans analizi yapılmış ve deneysel parametrelerin istatistiksel değerlendirmesi için betonların mekanik özellikleri üzerindeki etki faktörü belirlenmiştir. Ayrıca betonların aderans dayanımları ve mekanik özellikleri arasındaki etkileşimi görmek amacıyla deneysel verilerin korelasyonu yapılmıştır. Sonuçlar, su bağlayıcı oranı ne olursa olsun silis dumanı katkısı ve farklı tip çelik lif donatıları kullanılmasının, betonun mekanik özellikleri üzerinde önemli bir etkiye sahip olduğunu göstermiştir.Anahtar Kelimeler: Soğuk bağlama, Silis dumanı, Beton, Mekanik özellikler, Aderans dayanımı, Çelik lif. ABSTRACTEFFECT OF SILICA FUME AND STEEL FIBER ON THE MECHANICAL PROPERTIES OF THE CONCRETES PRODUCED WITH COLD BONDED FLY ASH AGGREGATESALZEEBAREE, RadhwanM.Sc. in Civil EngineeringSupervisor: Associated. Prof. Dr. MEHMET GESOĞLUJuly 2012, 102 PagesThis study presents an experimental research on the mechanical properties of steel fiber incorporated plain and silica fume (SF) concretes produced with cold bonded artificial fly ash aggregates (AFA). Two concrete series with water-to-binder (w/b) ratios of 0.35 and 0.55 were designed. SF incorporation was achieved by 10% replacement of the weight of cement by silica fume. Two types of hooked-end steel fibers with length/aspect ratios of 60/80 and 30/40 were utilized. AFA, produced from cold bonding pelletization of 90% class F fly ash and 10% Portland cement, were used as coarse aggregate in all of the concrete mixtures. The mechanical properties investigated were compressive strength; splitting tensile strength, modulus of rupture and bonding strength between rebar and concrete. The tests were carried out at the end of 28 day water curing. Analyses of variance of the experimental results were performed and the contributions of the significant factors on the mechanical characteristics of the concretes were determined for statistical evaluations. Moreover, correlation of the experimental data was carried out to monitor the interaction between mechanical properties and bonding strength of the concretes. The results demonstrated that incorporation of SF and utilization of different types of steel fiber reinforcements significantly affected the mechanical properties of the concretes regardless the w/b ratio.Keywords:Cold bonding, Silica fume, Concrete, Mechanical properties, Bonding strength, Steelfiber. 121

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results