علي عبد الحسين مجبل التميمي

Roller-compacted concrete (RCC): is defined as that concrete of no-slump consistency in its unhardened state that is transported, placed, and compacted by roller compaction. RCC has traditionally been used for carrying heavy loads in low speed areas. However, it has been used recently in commercial areas and highways. Steel fiber reinforced roller compacted concrete (SFR-RCC) is RCC mixture with an added amount of steel fiber (SF) to improve the compressive and flexural strength and to increase the inherent ability to control cracking. The purpose of this research is to study the effect of using steel fiber reinforcement on the properties of RCC in which cementitious materials (CMs) was partially replaced with cement kiln dust (CKD), in airports pavement. In this study, the (SFR-RCC) mixes were prepared using different contents of SF, (30, 50, 70, 90 kg/m3) of concrete. An amounts of (5%, and 10%) of cementitious materials (CMs) weight were partially replaced by cement kiln dust. Preparing SFR-RCC specimens was done by mixing all materials, next compacting the mixes in the laboratory using a locally made manually controlled roller device. Compressive, and flexural strength tests were done using cubes and prisms obtained by sawing SFR-RCC specimens. Ultrasonic pulse velocity (UPV) and bulk density tests were also conducted. The test results of plain samples (with no SF) at 28-days age showed that the partial replacement of (5%) of CMs by CKD was better than the (10%) replacement, concerning compressive strength, flexural strength and the bulk density. The results showed that the RCC specimens with 5% replacement of CMs by CKD possessed at 28 days age, a 2.37 ton/m3 bulk density, and a compressive, flexural strengths of 31, 7.6 MPa respectively while the UPV was equal to 4.33 km/sec. It was shown that the compressive strength of the RCC specimens with 5% replacement of CMs by CKD, increased by (19, 25, 32, and 42%) when the concrete was reinforced with SF with contents of (30, 50,70, and 90 Kg/m3 SFR), respectively compared with results of plain concrete with the same CKD replacement. The corresponding increases in the flexural strength were (15, 34, 37,and 40%) respectively. Furthermore the specimens with 10% replacement of CMs by CKD had an increase in the compressive strength by (14, 22, 26, and 41%) when the concrete was reinforced with (30, 50,70, and 90 Kg/m3 SFR) respectively. The corresponding increases in flexural strength were (4, 23, 36, and 40%) respectively. Regarding the consistency of the concrete, there is a decrease in its workability with the increase in the addition of SF. The results of (UVP) test had shown that the RCC specimens possessed good concrete quality especially for the fiber reinforced mixes. The research had shown the feasibility of using steel fibers as a reinforcement for RCC in which CKD was used as a substitution for 5 to 10 % of CMs.This will enhance the properties of RCC and decrease the negative impacts of CKD on the environment.

يغطي الباب الاول من مدونة شبكات الصرف الصحي ومحطات الرفع والضخ والمعالجة للمدن، تعاريف ومصطلحات ورمو ا ز ذات علاقة بأسس تصاميم وتنفيذ وتشغيل وصيانة شبكات الصرف الصحي ومحطات الرفع والضخ والمعالجة للمدن، فيما يشمل الباب الثاني المعايير التصميمية والتشغيلية والصيانة والسلامة لشبكات مجاري تصريف مياه الصرف الصحي بما في ذلك ما يتعلق بالجانب الهيدروليكي والإنشائي على وفق ما يتلائم والظروف الطبيعية والحضرية وعلى ضوء المواصفات والمحددات النافذة لمدن جمهورية الع ا رق. يشمل الباب الثالث جميع المحددات والاشت ا رطات الخاصة بتصميم وانشاء وتشغيل وصيانة الأعمال المدنية والميكانيكية والكهربائية والسيطرة لمحطات الرفع والضخ لمياه الصرف الصحي المطرية والثقيلة ولكافة تصنيفاتها المبنية على نوع المضخات والمبنية على نوع أحواض المحطة، كما يشمل الباب المحددات والاشت ا رطات البيئية والسلامة العامة الخاصة بمحطات الرفع والضخ. يتضمن الباب ال ا ربع عرض المحددات والاشت ا رطات الخاصة بتصميم وتنفيذ وتشغيل وفحص وصيانة محطات معالجة مياه الصرف الصحي البلدية التي تتخلف عن الانشطة المتعارفة في المدن من مناطق سكنية وتجارية فضلا عن قطاعات صناعات خفيفة ومحدودة

Abstract- Roller compacted concrete (RCC), is known as, concrete compacted by roller compaction that, in its unhardened state, will support a roller while being constructed. RCC is a reliable material used successfully in the construction of heavy-duty low speed pavements. The aim of this research was to study the characteristics of RCC in which, different percentages (0, 5, 10 and 20) % of cementitious materials (CMs) were replaced by cement kiln dust (CKD). . The results indicated that the mechanical properties of the RCC control mix (with 0 % CKD) fulfilled the requirements of concrete used for airport pavements. It was proved that the RCC specimens in which 5% of the CMs (6.67 % of cement) was replaced by CKD possessed the best properties in comparison with other specimens with 10, and 20% replacement percentages. The study showed that the RCC with 5%, partial replacement of CMs by CKD could fulfill the requirements of the surface layer of airport apron pavements, while RCC with 10% replacement could be used for the construction of subsurface layers of these pavements. A new usage of RRC was confirmed, lowering the negative environmental impact of CKD, and achieving the production of sustainable pavements in airports,. 1-Introduction

Abstract. Roller-compacted concrete is defined as that concrete of no-slump consistency in its' unhardened state that is transported, placed, and compacted by roller compaction. The purpose of this research is to study the effect of using steel fiber reinforcement on the properties of roller compacted concrete in which, 5%, and 10% of the cementitious materials were replaced by cement kiln dust. Different contents of steel fibers were used to reinforce concrete which were compacted using a manually controlled roller device. The results showed that the compressive strength of the roller compacted concrete with 5% replacement of cementitious materials increased by 19, 25, 32, and 42%, when the concrete was reinforced using steel fibers amounts of 30, 50, 70, and 90 Kg per m3 of concrete respectively. The corresponding increases in the flexural strength were (15, 34, 37, and 40%). Similar increases were recorded for specimens with 10% replacement. The research had confirmed the feasibility of using steel fiber reinforcement to enhance the properties of this kind of concrete to be used in airport pavements. Substitution of 5 to 10 % of the cementitious materials by cement kiln dust will save energy and contribute in decreasing the impact of pollutants on the environment

يحقق الابتكار معالجة تسمح بترطيب الخرسانة مع امكانية اجراء الفحوص عليها في الوقت نفسه، إذ تتضمن فكرة الابتكار تصميم نظام اوتوماتيكي لإيصال الماء او الماء الملحي باستمرار وبمعدل مسيطر عليه لغرض ترطيب مواقع محددة من الاعضاء الخرسانية المسلحة والوسط الحافظ للرطوبة بين القطب السالب والخرسانة اثناء تعريض الخرسانة لظروف تسرّع من حصول تآكل حديد التسليح فيها.

Corrosion of reinforcing steel is one of the most important and prevalent mechanisms of deterioration for reinforced concrete structures in marine environment. The research aims to study the effect of addition of silica fume (SF) and compressive strength on the corrosion of steel bars in marine reinforced concrete structures. Sixteen (300×120×120mm) reinforced concrete specimens were exposed to simulated marine environment using an invented system prepared for this purpose. Four types of concrete mixes were used. These mixes had 28 and 35 MPa compressive strength with and without addition of 10% SF (by mass of cement). After 90 days of exposure to natural marine simulated environment, polarization tests were implemented to measure the actual corrosion rate in each specimen. After that, an electrochemical technique was utilized to accelerate the corrosion process to achieve virtual exposure ages of 5 and 25 years. The results showed that addition of 10% SF by weight of cement, or increasing concrete compressive strength from 28 to 35 MPa, reduced the rebars corrosion rate after 25 years exposure from (moderate) to (low) limit according to ACI 222. The highest reduction in corrosion current density could be achieved by adding silca fume to concrete and increasing its compressive strength at the same time. A reduction percentages in corrosion rate of 48%, 79% and 78% were achieved at 90days, 5years, 25years exposure periods. Using of a cover thickness of (40 mm) in marine structures as specified by Unified Arabian Code for Reinforced Concrete Structures, may expose those structures to corrosion risk after long exposure period. After long exposure periods, the effect of addition of SF and increasing compressive strength, on rebars corrosion current, did not directly

جرت ترقية الدكتور علي عبد الحسين مجبل التميمي الى مرتبة "استاذ" بموجب الامر الجامعي المرقم ت ق / 3567 في 2022/2/6 واعتبارا من 2022/9/13

جرى خلال الاجتماع السابع الافتراضي للجنة الدائمة لكودات البناء العربية التابعة لجامعة الدول العربية انتخاب الدكتور علي عبد الحسين مجبل ممثل جمهورية العراق بالإجماع نائبا لرئيس اللجنة الدائمة لكودات البناء العربية الموحدة للبناء للأعوام 2022-2023. وقال الدكتور علي التميمي التدريسي في كلية الهندسة جامعة الكوفة ان الاجتماع حضره ممثلو احدى عشرة دولة عربية هي (جمهورية العراق والمملكة الاردنية الهاشمية والجمهورية الجزائرية الديمقراطية الشعبية والمملكة العربية السعودية ودولة فلسطين ودولة قطر ودولة الكويت والمملكة المغربية وجمهورية مصر العربية والجمهورية اليمنية والجماهيرية الاشتراكية الديمقراطية الليبية) والمنظمة العربية للتنمية الصناعية والتعدين والامم المتحدة للبيئة UNEP)) والأمانة الفنية للجنة الدائمة. وبين الدكتور التميمي ان مساهمة جمهورية العراق كانت فاعلة ومتميزة، قدمت خلالها جمهورية العراق العديد من أوراق العمل والمقترحات التي حظيت بإشادة الدول العربية المشاركة في الاجتماع، وحصلت الموافقة عليها وادرجت في مقررات اللجنة. وذكر ممثل جمهورية العراق ان اللجنة اتخذت القرارات المناسبة لكل بند والتي تهدف الى تفعيل اعداد وتحديث وتطبيق الكودات العربية الموحدة للبناء في الدول العربية

جرى ىنتخاب التدريسي علي عبدالحسين التميمي نائبا لرئيس اللجنة الدائمة للكودات العربية الموحدة في الجامعة العربية للسنين 2020 - 2021 خلال الاجتماع الخامس للجنة الذي عقد في مقر الجامعة العربية في القاهرة

ااختارت وزارة الصحة والبيئة العراقية لاستاذ المساعد علي عبد الحسين التميمي رئيسا للجنة العليا للإشراف على تحديث كودات التكييف والتبريد والعزل الحراري وفق متطلبات اتفاقية التخلص من المواد المستفدة لطبقة الأوزون الخاصة بمشروع التخلص من المواد المستنفدة لطبقة الاوزون HPMP

ااختارت وزارة الصحة والبيئة العراقية لاستاذ المساعد علي عبد الحسين التميمي رئيسا للجنة العليا للإشراف على تحديث كودات التكييف والتبريد والعزل الحراري وفق متطلبات اتفاقية التخلص من المواد المستفدة لطبقة الأوزون الخاصة بمشروع التخلص من المواد المستنفدة لطبقة الاوزون HPMP