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Article
Experimental Behavior of Self Compacting Concrete Corbels Strengthened with External CFRP

Authors: Sarmad Sh. Abdulqader --- Basil S. Al-Shathr --- Ali Kh. Hasan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 2 Part (A) Engineering Pages: 154-162
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This research aims to study the influence of using Carbon Fiber Reinforced Polymer (CFRP) strips as an external strengthened and repairing material on the behavior of self-compacting concrete (SCC) Corbels. The experimental work involved testing twenty self-compacting concrete corbels specimens. The experimental work is divided into two parts; the first part consists of three groups to investigate the most effective direction, position, bonding type and amount of CFRP strips on the behavior of corbels and utilized it in practice, also to strengthen new variables that are investigated in the second part. Two groups in part one are strengthened with different numbers of inclined and horizontal direction of CFRP strips, while in the third group the specimens were strengthened with strips of CFRP having different directions and bond types to improve the strength capacity and behavior of corbels. This improvement is represented by increase cracking load by about (94)% and increase in their ultimate load capacity of strengthening corbels which varies from about (19 to 88)%. While the second part of experimental work included the following variables: shear span to effective depth ratio (a/d), amount of horizontal steel reinforcement stirrups and repaired damaged corbels. The reinforced concrete corbels in this part were strengthened and repaired by CFRP strips depending on optimum result that is produced from part one wherefrom position, direction and amount are considered. It was found for un-strengthened and strengthened corbels having same horizontal secondary reinforcement stirrups that when (a/d) ratio decreases from 0.65 to 0.4 causes increase in cracking and ultimate loads reach (55)% and (35.41)% respectively. For un-strengthened and strengthened corbels having same (a/d) ratio, it was found an increase in cracking load which varies from (6.66 to 34.78)% and from (18.18 to 52.63) % in ultimate load when horizontal secondary reinforcement stirrups are increased. It was also found repairing SCC corbels with CFRP strips causes an increase in ultimate load reaching up to (50)% with respect to un-strengthened specimens. From results it is concluded that strengthened or repaired corbels present stiffer load deflection response than corresponding un-strengthened corbel (control corbel).

Keywords

Corbel --- Strengthen --- SCC --- Carbon Fiber.


Article
9.EVALUATION OF PHOSPHO-AKT IMMUNOHISTOCHEMICAL EXPRESSION IN PATIENTS WITH LARYNGEAL SQUAMOUS CELL CARCINOMA

Authors: Nisreen S. Wanas نسرين شريف وناس --- , Luma Y. Mehdi --- Liqa K.A. Alzubaidi
Journal: IRAQI JOURNAL OF MEDICAL SCIENCES المجلة العراقية للعلوم الطبية ISSN: P16816579,E22244719 Year: 2018 Volume: 16 Issue: 2 Pages: 177-181
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Background: Akt, is a serine/threonine protein kinase which act as an important regulator of cell proliferation and survival. The Akt complex is upregulated by phosphorylation producing phospho-Akt, which trigger a continued cell proliferation and survival and inhibit apoptosis, thereby promote cell survival.Objective: To evaluate the immunohistochemical expression of phosphorylated Akt (Phospho-Akt) in laryngeal squamous cell carcinoma (SCC) and to be correlated with different clinicopathological parameters.Methods: Phospho-Akt expression was investigated Immunohistochemically in 49 formalin-fixed paraffin embedded laryngeal SCC tissue sections collected from Teaching laboratories - Baghdad Medical City.Results: Phospho-Akt positive immunostaining appears in 57% of samples. Akt activation present in advanced stages of tumors with p value 0.02.Conclusion: The current findings may provide evidence that aberrant expression of Akt contributes to the pathogenesis (mechanism of disease development) of laryngeal SCC.Keywords: Akt, phospho-Akt, immunohistochemistry, laryngeal SCC, larynxCitation: Wanas NS, Mehdi LY, Alzubaidi LKA. Evaluation of phospho-AKt immunohistochemical expression in patients with laryngeal squamous cell carcinoma. Iraqi JMS. 2018; 16(2): 177-181. doi: 10.22578/IJMS.16.2.9


Article
Density and Ultrasonic Pulse Velocity Investigation of Self-Compacting Carbon Fiber- Reinforced Concrete

Author: G.A. Salman
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 1 Part (A) Engineering Pages: 89-99
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

comprehensive research has been carried out to understand the effect of adding carbon fibers to density and ultrasonic pulse velocity of self-compacting concrete. Fifteen SCC mixes were prepared with two types of mineral admixtures and carbon fibers. Metakaoline and silica fume were used as mineral admixtures while carbon fibers were used as fiber inclusions. Two different fiber length (6mm and12mm) and fiber fraction (0.1 % and 0.5 %) was used. Different parameters such as slump flow diameter, T500 time, V-funnel time, blocking ratio and filling height difference were used to evaluate fresh state properties. Air-dry density and Ultrasonic Pulse Velocity values are determined for mixes at age of 7, 28, 90 and 180 days. The experimental results indicate that concrete mixes contained carbon fiber showed higher air dry density than concrete mixes without fiber, the percentage increase were between 0.85% to 3.31% at age (7,28,90 and 180) days respectively. Concrete mixes contained carbon fiber compared with the reference mixes without carbon fiber exhibits an increase in the ultrasonic pulse velocity values of about 0.74% to 5% at age (7,28,90 and 180) days respectively .


Article
Immunohistochemical expression of CEA in Head and Neck Squamous and Adenosquamous cell carcinoma

Authors: Dr. Mustafa M. Abdulhussain B.D.S, M.Sc. --- د. مصطفى محمد
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2018 Volume: 15 Issue: 1 Pages: 90-96
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background: Squamous cell carcinoma (SCC) is an epithelial malignancy involvingmany anatomical sites and is the most common cancer capable of metastaticspread. Development of early diagnosis methods and novel therapeutics areimportant for prevention and mortality reduction.Aim of the present study was to evaluate the expression of CEA in Head and NeckSquamous cell carcinoma and Adenosquamous carcinoma with the progression ofmalignant disease.Materials and Methods: Sections of formalin-fixed paraffin embedded blocksspecimens of (28)Squamous cell carcinoma and (5) Adenosquamous carcinomawere immunostained to assess the expression of CEA in Head and NeckSquamous cell carcinoma cases.Results: CEA expression was sometimes associated with cytoplasmic staining. Theintensity of staining was correlated with the grade of differentiation: grade I waspoorly positive staining, while grade III was generally deeply positive stainingConclusions: The immunohistochemical expression of CEA is useful, in addition toother diagnostic criteria, for establishing a differential diagnosis in the case ofprimary and metastatic cancer.


Article
SULFATE AND CHLORIDE RESISTANCE OF NANOSILICA AND MICROSILICA CONTAINED SELF-CONSOLIDATING CONCRETES

Authors: Ikbal N. Gorgis --- Ali A. Jaber --- Maan S. Hassan
Journal: KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية ISSN: 25230018 Year: 2018 Volume: 9 Issue: 4 Pages: 23-44
Publisher: University of Kufa جامعة الكوفة

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Abstract

This comparison study focuses on the impacts of using nano-silica (nS) on chemical attack resistance of self-consolidating concrete (SCC) and its effectiveness in comparison to similar replacement levels of the more widely employed micro-silica (mS). Two types of cement were used to produce concrete mixes and three different percentages (3, 4.5, and 6 %) of nanosilica and microsilica were added as a replacement of cement by weight. Concrete specimens were cast and exposed to four harmful conditions including: sulfate solution, chloride solution and both of them for a period of up to 400 days. Based on the obtained results, replacement with colloidal nS proved to be significantly more effective in the chemical resistance than equivalent replacement of dry powder mS. The noticed improvements in chloride resistance and chloride penetration performance for concretes contained nS was correlated with the compressive strength results, which indicates for better pore structure characteristics. As expected, the improvement in the chemical resistance was more pronounced in concretes with cement type V.


Article
THE EFFECT OF PARTICLE SIZE DISTRIBUTION (PSD) OF RUBBRIZED SELF-COMPACTING CONCRETE (RSCC)

Authors: Nahla Naji Hilal --- Sheelan Mahmoud Hama
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 2 (Part-4) Pages: 13-22
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Three groups of waste scrap: fine rubber, mixed rubber, and tire chips, were used as partial replacement instead of natural fine and coarse aggregate at various level, respectively. The tire chips and three differently graded crumb rubbers (fine crumb rubber, coarse crumb rubber, and mixing crumb rubber) and 5- designated of crumb rubber at 5.0%, 10.0%, 15.0%, 20.0%, and 25.0% replacement levels, were adopted as study parameters. The fresh and hardened properties were investigated. Flexural tensile strength was tested according to ASTMC293 and ASTMC78.The results of this study are affected by size and content of wastes crap tire rubber and the type of testing also effect on the calculated strength. ASTMC293 test method gave higher value than ASTMC78 test method by 30-40%.


Article
EFFECT OF WEB REINFORCEMENT ON SELF-COMPACTING REINFORCED CONCRETE CONTINUOUS DEEP BEAMS

Authors: Abdul_Qader Nihad Noori --- Adnan Falih Ali
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 4 Pages: 211-228
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The main purpose of this experimental study is to investigate the behavior and strength of self-compacting reinforced concrete continuous deep beams with and without web reinforcement. The program included cast and test of five beam specimens, in which the vertical and horizontal shear reinforcement were varied. All specimens had the same length, depths and main flexural reinforcement ratio and they were subjected to concentrated vertical loads only. It was found that the addition of vertical shear reinforcement with minimum ratio (ρv=0.25%) increases the both of cracking and ultimate loads by about 10%, When vertical shear reinforcement is increased by about 80% (from 0.25% to 0.45%) a noticeable increases in the ultimate load capacity is observed (the enhancement reached to 18.6%).When providing horizontal web reinforcement of (ρh=0.343%) in addition to the provided vertical shear reinforcement (ρv=0.25%), the cracking and ultimate loads increased by about (17.5% and 25%) respectively, while the previous ratios of the cracking and ultimate loads increased to (20% and 33%) respectively when vertical shear reinforcement increased to (ρv=0.45%).

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