Association of Arab Universities Journal of Engineering Sciences最新文献_第7页

Effect of Shear Span to Effective Depth Ratio on the Behavior of Self-Compacting Reinforced Concrete Deep Beams Containing Openings Strengthened with CFRP 剪跨与有效深度比对CFRP加固自密实深孔钢筋混凝土梁性能的影响

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.001

Nabeel A. Al-Bayati, Bassman Muhammed, M. Oda

{"title":"Effect of Shear Span to Effective Depth Ratio on the Behavior of Self-Compacting Reinforced Concrete Deep Beams Containing Openings Strengthened with CFRP","authors":"Nabeel A. Al-Bayati, Bassman Muhammed, M. Oda","doi":"10.33261/JAARU.2019.26.1.001","DOIUrl":"https://doi.org/10.33261/JAARU.2019.26.1.001","url":null,"abstract":"Results of test on seven simply supported self-compacting reinforced concrete deep beams, including six of these beams containing circular openings in center of load path are reported in this paper. The objective of the tests was determined the influence of, changing shear span to effective depth ratio a/d, the existence of circular openings in shear span and using inclined strips of carbon fiber polymer (CFRP) on behavior of deep beams. The general trend in crack pattern, the load-deflection response, and the mode of failure of reinforced SCC deep beams were also investigated. All specimens had the same geometry, details of the flexure and shear reinforcement in both vertical and horizontal directions and they were tested under symmetrical two-point loads up to failure. The experimental results revealed that the web openings within shear spans caused an important reduction in the deep beam capacity by 50% when compared with the corresponding solid beam. The increase a/d ratio from 0.8 to 1.2 decreases the ultimate load by 21.7% and 22.5 % for the reference unstrengthened beam and strengthened beam, respectively, also it was found that the externally inclined CFRP strips in deep beams increased the ultimate strength up to 39.5%, and enhanced the stiffness of deep beams with openings.","PeriodicalId":414074,"journal":{"name":"Association of Arab Universities Journal of Engineering Sciences","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133683900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of calcined silt on the durability of Glass Fiber Reinforced Concrete (GRC) 煅烧淤泥对玻璃纤维增强混凝土(GRC)耐久性的影响

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.025

Susan Tuffaha, Ali A. Khairbek, E. Fadel

{"title":"Effect of calcined silt on the durability of Glass Fiber Reinforced Concrete (GRC)","authors":"Susan Tuffaha, Ali A. Khairbek, E. Fadel","doi":"10.33261/JAARU.2019.26.1.025","DOIUrl":"https://doi.org/10.33261/JAARU.2019.26.1.025","url":null,"abstract":"The aim of this study is improving the durability of Glass Fiber Reinforced Concrete )GRC( and in the context of sustainability applications, reduction of cement consumption, and replacement of it with environmentally friendly materials. This study was conducted to test the role of Metakaolin produced by calcination of silt from Baloran dam in Lattakia on the Syrian coast as supplementary cementing material by 10% -15% -20% - 25% in GRC mixture, and to determine the effect of it on the consistency and flexure strength over 180 days, as well as to test its role in improving the micro-structure of the mixture by reducing the content of Ca(OH)2 which were tested using X-Ray Diffraction (XRD) techniques, and as a result reduced the erosion of fibers as shown in images by Scanning Electronic Electron Microscopy (SEM). Moreover the role of calcined silt has been studied in controlling the degradation of the material over time which tested by immersion in hot water 50° C for 150 days and by drying – wetting cycles. Also the effect of calcined silt on absorption, porosity and resistance of sulfates attacks was studied. The results have shown that used silt has no negative effect on consistency or mechanical properties, and it improved all the studied durability factors.","PeriodicalId":414074,"journal":{"name":"Association of Arab Universities Journal of Engineering Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128849577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Competitive Adsorption of Cd (II) and Zn (II) in Single and Binary systems from Aqueous Solutions onto Cork Stopper Particles 软木塞颗粒对水溶液中单、二元体系中Cd (II)和Zn (II)的竞争性吸附

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.003

Shahlaa E. Ebrahime, Saja H. Alsaade

引用次数: 4

Lubricating Properties of Water-Based Drilling Fluid Improvement Using Lignite NPs as well as Their Effect on Rheological and Filtration Properties 褐煤NPs改善水基钻井液润滑性能及其对流变性能和过滤性能的影响

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.011

M. Salam, N. Al-Zubaidi, Asawer A. Al-Wasiti

{"title":"Lubricating Properties of Water-Based Drilling Fluid Improvement Using Lignite NPs as well as Their Effect on Rheological and Filtration Properties","authors":"M. Salam, N. Al-Zubaidi, Asawer A. Al-Wasiti","doi":"10.33261/JAARU.2019.26.1.011","DOIUrl":"https://doi.org/10.33261/JAARU.2019.26.1.011","url":null,"abstract":"In the process of drilling directional, extended-reach, and horizontal wells, the frictional forces between the drill string and the wellbore or casing can cause severe problems including excessive torque which is one of the most important problems during drilling oil and gas well. Drilling fluid plays an important role by reducing these frictional forces. In this research, an enhancement of lubricating properties of drilling fluids was fundamentally examined by adding Lignite NPs into the water-based drilling fluid. Lubricity, Rheology and filtration properties of water-based drilling fluid were measured at room temperature using OFITE EP and Lubricity Tester, OFITE Model 900 Viscometer, and OFITE Low-Pressure Filter Press, respectively. Lignite NPs were added at different concentrations (0.05 %, 0.1 %, 0.2 %, 0.5 %, and 1 %) by weight into water-based drilling fluid. Lignite NPs showed good reduction in COF of water-based drilling fluid. The enhancement was increased with increasing Lignite NPs concentrations; 23.68%, 35.52%, and 45.3 % reduction in COF were obtained by adding 0.2%, 0.5%, and 1% by weight Lignite NPs concentration, respectively.","PeriodicalId":414074,"journal":{"name":"Association of Arab Universities Journal of Engineering Sciences","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128466175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Shoulder–Workpiece Interference Depth on the Quality of Friction Stir Welding of AA7075-T6 Aluminium Alloy 肩-工件过盈深度对AA7075-T6铝合金搅拌摩擦焊接质量的影响

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.020

A. A. Abbas, H. H. Abdulkadhum

{"title":"Effect of Shoulder–Workpiece Interference Depth on the Quality of Friction Stir Welding of AA7075-T6 Aluminium Alloy","authors":"A. A. Abbas, H. H. Abdulkadhum","doi":"10.33261/JAARU.2019.26.1.020","DOIUrl":"https://doi.org/10.33261/JAARU.2019.26.1.020","url":null,"abstract":"The joining of high strength aluminium alloy AA7075-T6 sheets of 3 mm thickness was an attempt utilizing friction stir welding process. The effect of interference depth between tool shoulder and surface workpiece on the welding quality and its effect on the mechanical and metallography properties of welded joints were studied. This process is carried out using a composite tool consists of a concave shoulder made of H13 tool steel and cylindrical left-hand thread with 1mm pitch pin (probe) made of cobalt-based alloy MP159. The dimensions of tools were 14mm shoulder diameter and the pin has 5mm diameter and 2.7mm length. The tool rotation speed and welding speed were 981 rpm 169 mm/min respectively, and the tilt angle was 2°. The range of interference depth between the shoulder and workpiece was selected (0.05, 0.1, 0.15, 0.2, 0.25, and 0.3) mm. various tests were executed to evaluate the welding quality. The results show that lack of filling defect appeared on the welding surface at the interference depth 0.05 mm. An invisible tunnel and lack of penetration in the bottom of the stir zone appeared when the interference depths were 0.1 mm and 0.15 mm. Defect-free welds obtained when interference depths were (0.2, 0.25, and 0.3) mm. The welding efficiency of the defect-free welds was in the range (85.3-92.3%) depending on the ultimate tensile strength of the parent alloy.","PeriodicalId":414074,"journal":{"name":"Association of Arab Universities Journal of Engineering Sciences","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122380115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Movable Thermal Screen For Saving Energy Inside The Greenhouse 温室内节能的活动热屏

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.014

Saif Mahmood Shakir, Ammar A. Farhan

{"title":"Movable Thermal Screen For Saving Energy Inside The Greenhouse","authors":"Saif Mahmood Shakir, Ammar A. Farhan","doi":"10.33261/JAARU.2019.26.1.014","DOIUrl":"https://doi.org/10.33261/JAARU.2019.26.1.014","url":null,"abstract":"In this work, a movable thermal screens was designed and examined for the purpose of decreasing greenhouse heating loss in Baghdad during winter nights. Three types of automatic movable thermal screens were tested to decrease the heat loss inside a greenhouse. The transparent cover area was 29.2 with 4 mm glass cover thickness. The mathematical model was formulated in four parts which are the inside air, transparent cover, soil surface, and subsoil layer. The results of the thermal curtains showed that the average temperature of the inside air during the night for the polyethylene, polypropylene, and bubble films was 8.1 ̊C, 10.3 ̊C, and 12.5 ̊C respectively and greenhouse without screens was 5.9 ̊C. These results showed that the bubble film was more effective in a saving energy than polypropylene and polyethylene films. Good agreement was obtained between the mathematical model and the measured values (with relative root mean square errors below 5%). It was shown that the suggested different types of movable thermal curtains were powerful in decreasing heating losses, which is reached about 21.7 % compared with a greenhouse without curtains.","PeriodicalId":414074,"journal":{"name":"Association of Arab Universities Journal of Engineering Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131218244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Geotechnical Properties of Clayey Soil Contaminated with Copper 铜污染粘性土的岩土力学特性研究

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.010

S. Ali, M. Karkush

{"title":"Geotechnical Properties of Clayey Soil Contaminated with Copper","authors":"S. Ali, M. Karkush","doi":"10.33261/JAARU.2019.26.1.010","DOIUrl":"https://doi.org/10.33261/JAARU.2019.26.1.010","url":null,"abstract":"In this research, the effectsof coppersulfate contamination on the chemical, physical and mechanical properties of cohesive soil have been studied and compared with the properties of intact soil. Soil sampleswere obtained from Al-Ahdab oil field in Wasit governorate, located in the east of Iraq. In the laboratory, the soil specimens were contaminated artificiallywith three quantities of copper sulfate) CuSO4.5H2O) (100, 200 and 400) gm. The contaminantwas dissolved in 10 liters of distilled water and then added to the intact soil. The intact soil samplekept soaked with the contaminantfor 30 days. Several tests were conducted onthe soil samples (intact and contaminated) to measure the effects of copper sulfate on the geotechnical properties of clayey soil. The results of tests showed significant effectsfor copper on the studied soil properties. The copper sulfate causesdecreasing the percentage of fine particles in the soil, Atterberg s limits, permeability and optimum water content. Inaddition, the copper sulfate causes increasing thespecific gravity andmaximum dry density of soil. The shear strength parameters of soil are measured by using direct shear test, unconfined compression test and unconsolidated undrained triaxial test are decreased with increasing the concentration of copper sulfate in soil. Also, its noted increasing the initial void ratio, the compression index and recompression index with increasing concentration of contaminant in soil.","PeriodicalId":414074,"journal":{"name":"Association of Arab Universities Journal of Engineering Sciences","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115433476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical Analysis on the Effect of Surface Horizontal Traction on Top-Down Cracking of Flexible Pavement 路面水平牵引对柔性路面自顶开裂影响的理论分析

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.022

Z. Alkaissi, Y. Al-Badran, Najwa Wasif

{"title":"Theoretical Analysis on the Effect of Surface Horizontal Traction on Top-Down Cracking of Flexible Pavement","authors":"Z. Alkaissi, Y. Al-Badran, Najwa Wasif","doi":"10.33261/JAARU.2019.26.1.022","DOIUrl":"https://doi.org/10.33261/JAARU.2019.26.1.022","url":null,"abstract":"Fatigue cracking of flexible pavement is one of the most important elements that should be considered due to the damage occurs in asphalt layer under the effect of wheel load repetitions. This research demonstrated theoretical study on top-down fatigue crackingusing the finite element method. A three- dimensional finite elastic structural element is used to modal pavement using (ABAQUS ver. 6.12.1) program. The results obtained from this studydemonstrated that maximum value of tensile strain developed at the surface of asphalt layer for flexible pavement due to the horizontal traction generated from wheel load application at contact area. Also, the horizontal tensile strain ( ) at surface of asphalt layer is increasing rapidly with load repetitions with values greater than that generated at bottom by (94%) at failure. This prescribed the basic or inherent features of top crack initiation and down propagates within asphalt layer in flexible pavement. The top horizontal tensile strains obtained from the finite element model is higher than the empirical relations by (20%); since the finite element analysis of flexible pavement considered the surface horizontal tensile strains due to contact traction force at tire pavement interface. Finally, according to the results of this study the horizontal tensile strains at the top of asphalt surface significantly increase the damage intensity of fatigue failure for flexible pavement.","PeriodicalId":414074,"journal":{"name":"Association of Arab Universities Journal of Engineering Sciences","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122663518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Improving the Performance of Drilling Fluid Using Lignite Nano Particles 利用褐煤纳米颗粒改善钻井液性能

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.013

G. Falih, N. Al-Zubaidi, A. Alwasi̇ti̇

引用次数: 0

Application of Artificial Neural Network and Geographical Information System Models to Predict and Evaluate the Quality of Diyala River Water, Iraq 人工神经网络与地理信息系统模型在伊拉克迪亚拉河水质预测与评价中的应用

Association of Arab Universities Journal of Engineering Sciences Pub Date : 2019-03-31 DOI: 10.33261/JAARU.2019.26.1.021

Fatima Muqdad Al-Rubaie, N. O. Al-Musawi

{"title":"Application of Artificial Neural Network and Geographical Information System Models to Predict and Evaluate the Quality of Diyala River Water, Iraq","authors":"Fatima Muqdad Al-Rubaie, N. O. Al-Musawi","doi":"10.33261/JAARU.2019.26.1.021","DOIUrl":"https://doi.org/10.33261/JAARU.2019.26.1.021","url":null,"abstract":"This research discusses application Artificial Neural Network (ANN) and Geographical Information System (GIS) models on water quality of Diyala River using Water Quality Index (WQI). Fourteen water parameters were used for estimating WQI: pH, Temperature, Dissolved Oxygen, Orthophosphate, Nitrate, Calcium, Magnesium, Total Hardness, Sodium, Sulphate, Chloride, Total Dissolved Solids, Electrical Conductivity and Total Alkalinity. These parameters were provided from the Water Resources Ministryfrom seven stations along the river for the period 2011 to 2016. The results of WQI analysis revealed that Diyala River is good to poor at the north of Diyala province while it is poor to very polluted at the south of Baghdad City. The selected parameters were subjected to Kruskal-Wallis test for detecting factors contributing to the degradation of water quality and for eliminating independent variables that exhibit the highest contribution in p-value. The analysis of results revealed that ANN model was good in predicting the WQI. The confusion matrix for Artificial Neural Model (NNM) gave almost 96% for training, 85.7% for testing and 100% for holdout. In relation to GIS, six color maps of the river have been constructed to give clear images of the water quality along the river.","PeriodicalId":414074,"journal":{"name":"Association of Arab Universities Journal of Engineering Sciences","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115892754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0