Table of content

Journal of Engineering

مجلة الهندسة

ISSN: 17264073
Publisher: Baghdad University
Faculty: Engineering
Language: Arabic and English

This journal is Open Access

About

The Journal Engineering was issued in 1986. It was Stopped from 1990 – 1997 because of the economic blockade. It restarted publication after the fourth scientific engineering conference for it published the papers that were accepted in the conference.
It is a scientific engineering journal refereed by specialized and qualified professors in most of the engineering fields and those Specialists in the issued by the college of Engineering university of Baghdad .It was serenely publibued , but from 2011 it has issued of monthly for the numerous papers submitted to the journal to publish their papers in this scientific journal in addition to some of the Arabs professors because the journal is considered one of the valued journals in the Arabic homelan .
Many professions were the head editor of the journal from its first issue. The first one was prof.dr. Laith Ismail Namiq then prof.dr. Mohammed A.Alawis ,prof.dr.Ali A Al – kilidar prof.dr. Abdul-Ilah Younis and currently Prof.dr.Qais S. Ismail.

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Contact info

Jadriyah, Baghdad
Iraq
Mobile:
Email: joengbag@uobaghdad.edu.iq

Table of content: 2017 volume:23 issue:6

Article
Evaluating Water Damage Resistance of Recycled Asphalt Concrete Mixtures
تقييم مقاومة التأثير الضار للماء لخلطات الخرسانة الاسفلتية المعاد تدويرها

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Abstract

Recycling process presents a sustainable pavement by using the old materials that could be milled, mixed with virgin materials and recycling agents to produce recycled mixtures. The objective of this study is to evaluate the impact of water on recycled asphalt concrete mixtures, and the effect of the inclusion of old materials into recycled mixtures on the resistance of water damage. A total of 54 Marshall Specimens and 54 compressive strength specimens of (virgin, recycled, and aged asphalt concrete mixtures) had been prepared, and subjected to Tensile Strength Ratio test, and Index of Retained Strength test. Four types of recycling agents (used oil, oil + crumb rubber, soft grade asphalt cement, and asphalt cement + sulphur powder), were adopted to prepare recycled mixtures, and the recycling agent of (soft grade asphalt) was used to prepare mixtures with further old materials contents. It was found that the Tensile Strength Ratio exceeds 75% for all recycled mixtures, and the recycled mixture with (oil + rubber) and 50% old materials content, had the highest Tensile Strength Ratio value comparing to other recycled mixtures. Results of Index of Retained Strength showed that mixtures with (Soft Ac) and (Ac + Sulphur) and 50% old materials, exceeded the Index of Retained Strength value for virgin mixture. Index of Retained Strength values decreased as the old materials content increased, Index of Retained Strength was (80.5%, 74.5%, 71.6%, and 67.62%) for recycled mixtures with (50%, 60%, 70%, and 80%) old materials content respectively.


Article
Construction Policies on Campus An Analytical Study of the Policy of Construction Planning on Kufa Campus
السياسات العمرانية في الحرم الجامعي دراسة تحليلية لسياسة التخطيط العمراني في حرم جامعة الكوفة

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Abstract

University Campuses, as any lively physical entity, is subject to continuous variation due to growth, development and change. This reality covers the existing or futuristic additives or additions, consecutively these changes may have a strong sensation of disorientation as a result of formatic changes in buildings, or in movement paths. And it epitomized the research problem to "the need for knowledge to clarify the impact of intellec-tual and executive policy in achieving coherence, functional and space organization of the elements of the university urban environment and in the stages of future growth and change," the search tar-geted "to highlight the study of constraction politics on campus Bmqomadtha intellectual and exec-utive , as well as clarify the role of the executive policy in the application of thought, "and formulat-ed the hypothesis search " urban policy affect Bmqomadtha (intellectual and executive) on the pro-cess of organizing and homogeneity of the university urban environment to make them adapted to future changes, "the University of Kufa it was chosen as the campus to represent the experimental field of research.


Article
Evaluating the Performance of High Modulus Asphalt Concrete Mixture for Base Course in Iraq
تقييم اداء الخلطة الاسفلتية العالية الجساءة لطبقة الاساس في العراق

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Abstract

In the 1980s, the French Administration Roads LCPC developed high modulus mixtures (EME) by using hard binder. This type of mixture presented good resistance to moisture damage and improved mechanical properties for asphalt mixtures including high modulus, good fatigue behaviour and excellent resistance to rutting. In Iraq, this type of mixture has not been used yet. The main objective of this research is to evaluate the performance of high modulus mixtures and comparing them with the conventional mixture, to achieve this objective, asphalt concrete mixes were prepared and then tested to evaluate their engineering properties which include moisture damage, resilient modulus, permanent deformation and fatigue characteristics. These properties have been evaluated using indirect tensile strength, uniaxial repeated loading and repeated flexural beam tests. EME mixes were found to have improved fatigue and permanent deformation characteristics, also showed more resistance to moisture damage than conventional mix by 9.3 percent and the resilient modulus at temperature 60 oC increased by 63 percent. The general theme viewed from the results of this study has added to local knowledge the ability to produce more durable asphalt concrete mixtures with better serviceability using EME mixes.


Article
Stabilization of Clay Soil Using Tyre Ash
تثبيت الترب الطينية الضعيفة باستخدام رماد الإطارات

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Abstract

The planning, designing, construction of excavations and foundations in soft to very soft clay soils are always difficult. They are problematic soil that caused trouble for the structures built on them because of the low shear strength, high water content, and high compressibility. This work investigates the geotechnical behavior of soft clay by using tyre ash material burnt in air. The investigation contains the following tests: physical tests, chemical tests, consolidation test, Compaction tests, shear test, California Bearing Ratio test CBR, and model tests. These tests were done on soil samples prepared from soft clay soil; tyre ash was used in four percentages (2, 4, 6, and 8%). The results of the tests were; The soil samples which gave the value of plas-ticity test were 2% (25), 4% (25.18), 6% (25.3), and 8% (26.7).The soil samples which gave the value of specific gravity were 2% (2.65), 4% (2.61), 6% (2.5), and 8% (2.36).The value of maximum dry density in a compaction test observed with 2% percentage gave the value 15.8 kN/m3, the 4% gave the value 15.4 kN/m3, 6% gave 15.3 kN/m3 and 8%with 15.2 kN/m3.Samples that gave the values of undrained shear strength test were 2% (55 kN/m2), 4% (76 kN/m2), 6% (109 kN/m2), and 8% (122 kN/m2). The best of them is 8%. The sample that gave the best value for swelling test was 8%.The best value for compression index Cc was in 8%.The results of CBR test, were improved in all soil samples. The soil samples which gave the value for CBR were 2% (3.507%), 4% (4.308%), 6% (5.586%), and 8% (9.569%). The best value was obtained from 8%.


Article
Synthesis of Nanozeolite NaA from Pure Source Material Using Sol Gel Method
تحضيرالنانو زيولايت نوع (NaA) من مصدر المواد النقية بطريقة معاملة الجل حراريا

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Abstract

In this work, the nano particles of Na-A zeolite were synthesized by sol –gel method. The samples were characterized by X-ray diffraction (XRD), X-ray Fluorescence (XRF), Surface area and pore volume, Atomic Force Microscope (AFM) and Fourier Transform Infrared Spectroscopy (FTIR). Results show that the nano A zeolite is with average crystal size is 74.77 nm., Si/Al ratio 1.03, BET surface area was 581.211m2/g and the pore volume for NaA was found equal to 0.355cm3/g.


Article
A Study of Parameters Affecting the Solvent Extraction-Flocculation Process of Used Lubricating Oil
دراسة العوامل المؤثرة على عملية الاستخلاص-التلبد بالمذيبات للزيوت المستهلك

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Abstract

The aim of this study was to investigate the effect of operating variables on, the percentage of removed sludge (PSR) obtained during re-refining of 15W-40 Al-Durra spent lubricant by solvent extraction-flocculation treatment method. Binary solvents were used such as, Heavy Naphtha (H.N.): MEK (N:MEK), H.N. : n-Butanol (N:n-But), and H.N. : Iso-Butanol (N:Iso:But). The studied variables were mixing speed (300-900, rpm), mixing time (15-60, min), and operating temperature (25-40,oC). This study showed that the studied operating variables have effects where, increasing the mixing time up to 45 min for H.N.: MEK, H.N.: n-Butanol and 30 min for H.N.: Iso-Butanol increased the PSR, after that percentage was decreased; increasing the mixing speed for all the studied solvents up to 700 rpm increased the PSR, after that the percentage was decreased, while increasing the operating temperature decreased the PSR for all the solvents. This study has resulted in reasonably accurate multivariate process correlation that relates the removed sludge percentage to the process variables. The determination coefficients (


Article
Design and Implementation of Classical Sliding Mode Controller for Ball and Plate System
تصميم وتنفيذ متحكم منزلق كلاسيكي لنظام الكرة ولوحة

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Abstract

Ball and Plate (B&P) system is a benchmark system in the control engineering field that has been used to verify many control methods. In this paper the design of a sliding mode controller has been investigated and verified in real-time via implementation on a real ball and plate system hardware. The mathematical model has been derived and the necessary parameters have been measured. The sliding mode controller has been designed based on the obtained mathematical model. The resulting controller has been implemented using the Arduino Mega 2560 and a ball and plate system built completely from scratch. The Arduino has been programmed by the Arduino support target for Simulink. Three test signals has been used for verification purposes, namely: single point stabilizing, circular trajectory tracking, and square trajectory tracking. The results obtained have shown that sliding mode controller is able to follow the desired test signals with low error.


Article
The Effect of Cyclic Bending Loads on Crack Growth in Pipes for Inclined and Transverse Cracks with or Without Internal Pulsing Pressure
تأثير احمال الحني الدورية على نمو الشق في الانابيب التي فيها شقوق مائلة او العرضية بوجود او عدم وجود الضغط النبضي الداخلي

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Abstract

In the present research a new test rig has been proposed to be suitable for different cyclic loads such as cyclic bending, cyclic torsion, proportional and non proportional loads. In this work the efforts were concentrated on the cyclic bending loads concerning cracked pipes with or without internal pulsing pressure to study crack propagation in small bore pipes (up to 1'') for transverse or inclined cracks. The rig simulates the real service conditions under different stresses by means the least dangerous case will be suggested, so the experiments were considered for copper pipe, and the results have been tabulated and drawn to demonstrate the crack growth behavior as well as to justify the outcomes practically, consequently the durability of this new rig has been confirmed with new concluded facts.

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