Muthanna Journal of Engineering and Technology(MJET)

The current work deals with the design of new rubber compounds as a viable alternative for commercial compounds used in diaphragm actuator of brake systems in most commercial vehicles like trucks, tractor-trailers and buses. Two new recipes were proposed to work instead of commercial recipe with experimental and analytical study to prove the high performance properties and workability. The finite element method by ANSYS 13 software was used to study the behavior of these compounds with Mooney-Rivlin 2-parameters during the work pressure range. Most of the results are acceptable competitive.

Experimental study of the flexural behavior of repaired reinforced concrete two way slabs with epoxy injection study in this paper. Eleven simply supported reinforced concrete slabs are used, five of which are made with (NSC), four with (HSC) and two with (LWC). The slabs is repair by used epoxy injection method. The aim of repair method is to increase or at last restore flexural strength of these slabs and to monitor their post-repair load-deflection behavior. Investigate the behavior of reinforced concrete two way slabs with different concrete compressive strength before and after repaired with epoxy injection is studied. Also, the efficiency of repaired after loading to the different level between (100%-66%) of the ultimate load obtained for control slab is investigated. The experimental results of repaired two way slabs indicate that; the repair method used is successful to restore or increase the capacity of slabs; the lower-strength slabs is higher increase in capacity compered with other slabs; after retesting the crack repaired do not reopen, instead, new nearby cracks are developed. In repaired slabs the the structural behavior is similar to that of original slabs, however, a lower stiffness and greater ductility are observed.

The problem of this study is that the building of foundation by stones at the present time leads to develop cracks in the superstructure. Therefore, the solutions and the right manner were suggested for building the stone in the small and big structures. This paper studies using and properties of stones in building of foundations, that the stone is rigid and stiff in the same time very cheap for building, especially in the regions wealthy with stone. The models were taken for analyzing, firstly experimentally in the field site and secondly by Plaxis Program using the Finite Elements with the same properties of the soil and calculate the vertical displacement, vertical strain, factor of safety and bearing capacity. It can be concluded that the using of the reinforced columns in the small foundation in addition to the beam and stones will reduce the vertical displacement and strain to lower values, maintain high value of bearing capacity and increase the factor of safety that makes the structure becomes safer. Also for the big structures like bridges another models were used with higher loadings and the same above parameters were calculated, the stone with special requirements approved to improve and treat the soil parameters even for the big structures.

In this research was conducted thermal coating process to follow flame spray technology through the use of gaseous mixture consisting of oxygen and acetylene for the purpose of obtaining the surface layer of nickel plating – Aluminum (metco450) on the surface of medium carbon steel type (AISI 1050). Provide an increase in the mechanical properties of the surface of the metal guide and compensate for the missing parts of the surface as a result of the process of wear and tear. Was conducted in three successive phases, first phase involved the preparation of models and to create the basis for this surface models as well as the preparation of powder coating and analyze the chemical components of the models and powder coating. While the second phase involved the implementation of the coating process (nickel – aluminum) using a flame spray coating process was carried out in different ways for each model through a change in the granular size of the powder coating. The third phase of the research included the testing of standard tests check adhesion, examination of roughness, check the wear and tear and check the hardness of the coating as well as microscopic examination of the paint and the surface layer basis. Where results showed that increasing the size particleboard from (25μm) to (75μm) led to increased wear rate and a decrease in adhesion coating layer, as noted increased roughness layer coatings increase size particleboard for powder coating, also led to increase size particleboard for powder coating to a decrease in hardness layer paint.

This investigation aims to improve the stress-strain behavior and mechanical properties of lightweight concrete in order to use it in structural members. Special type of lightweight concrete was produced in this study prepared by mixing Ordinary Portland Cement (OPC type I) and white gravel of low specific gravity, sand with very low percentage of 10% from gravel weight, and w/c ranged from 0.42 to 0.46, silica fume added as percentage from cement weight and STYRENE BUTADIENE RUBBER (SBR) was added also in different percentages (5%, 10% and 15%). The main mixes 1:5 (cement: gravel) and 1:4 were used in this study. The tests in this research include stress- strain tests for both ascending and descending portions, compressive strength test, tensile strength test, flexural strength test and density of specimens. The most significance effect done by adding 15% SBR resin and gives (110%) increment in compressive strength for 1:4 mixes and (142 %) increment for1:5 mixes. For mixes 1:5 and by adding 15% SBR, the tensile strength increased 100%, flexural strength increased also 62% and density of specimens increased 8.2% , but more significant effect is seen for mixes 1:4, the increased in tensile and flexural strength and density of specimens were 138%, 109% and 7.71% respectively. The values of modulus of elasticity increased also compared with reference mixes and have excellent values ,by adding 15%SBR the increment was (58 %) for 1:4 mixes, and (150 %) increment for 1:5 mixes, that increments are very important to reduce the deflection in concrete members such as slabs and beams, therefore, like this polymer concrete can be used as structural members.

The Contemporary narratives focused on the study of the architectural design process of general framework of an understanding of the important elements of the path of the process and ended to focus on the concept of innovation as a concept overarching all the bases underlying innovation in the process illustrates the design in architecture, hence the need arose to study the impact of the rest of the concepts adjacent it to strengthen and assigning creative path in general and its role in influencing the detailed stages of cost in particular. This paper goals are of defining general principles of the conceptions creativity and the importance of theory in architecture and classification stages of cost in addition to the display of vocabulary and concepts important adjacent and influential in the course design and productive to know the research problem is not so obvious effect of (check) concepts Utility (adjacent) in track design creative in Architecture the aim is to clarify the above and down to form a theoretical framework is Knowledge clear indications of what has been applied to the product of an architect specializing in order to explore the impact of these indicators achieved the objective of the research and then head to put the final conclusions and recommendations.

The research design evaluate the performance of Architecture Department students in the subject of the drawing architecture and presentation . If tool focuses interesting research on generating data sheets for students of Architecture Department – Muthanna University in an article drawing and presentation architectural the second phase for the academic year 2014-2015 in the final test in accordance with the tool designed. The consisted Find the extent of the problem of students mastering the skills of drawing architectural and presentation of it is the most important skill that must be mastered student of architecture in this area where the display gives the final design of the project an important indicator of student abilities and his skill. Performing has adopted a researcher descriptive analytical method based on the starters induction and deduction in determining the performing skills that must be mastered by the student in the subject of the drawing and the display architecture, where the research community of (30) in accordance produced by architecture students in the final exam of a material drawing for the academic year 2014- 2015. The tool was tested on a random sample of student work of (10). The researcher designed tool to (20) paragraph researcher used statistical means the arithmetic average – link Pearson coefficient – ranks Spearman coefficient is to establish Measure – Cooper equation and the program of statistical (MINITAB -14). This resulted Find tool are valid and reliable estimate of grades suitable for students in the subject of architectural drawing and the display is more objective than it was previously estimated.

Selection of appropriate Manning’s coefficient is critical to the accuracy of computed water surface profiles. Moreover, estimation of channel roughness parameter is of key importance in the study of open- channel flow particularly in hydraulic modeling. Hence, it is essential to calibrate the channel roughness coefficient for open channel whether natural or artificial. In the present study, it is attempted to calibrate the value of Mannnig’s “n” coefficient by comparing the computed water surface profiles with observed one, using HEC-RAS steady flow model for shatt al-Rumaith channel in Al-Muthanna (Iraq). For this calibration, the flows for the year 2014 has been considered. It is found that the value of Manning’s roughness coefficient for shatt al-Rumaith shows a good agreement between the computed with observed water surface profiles, is n=0.023 and n= 0.04 for main channel and floodplain respectively.

Noise pollution around the Al-Muthanna university in Al-Samawah city was measured to study the effects on the teaching-learning processes and performance of both teachers and students during November and December 2014. Digital Sound Level Meter (model a GM1351 ) was used to measure the noise level, In twelve selected buildings for the study as indoor sites and the park and main door of the university as outdoor sites . The measurements at the buildings were carried out in three different time intervals of the day i.e. in the morning 8:00-10:00am, 10:00-12:00 pm and 12:00-2:00 pm. Noise intensity was also measured in two points at an interval of half hour. After recording of daily measurements of noise level, the hourly average noise level for each point of the building and for the whole buildings were calculated. As well as the total average of noise levels was calculated in order to compare it with the allowable limits of EPA for educational institutions. The maximum noise level was found in college of education (81.8) dBl and the minimum value in college of nursing which was equal(73.3) dBl. The study results show that the rate of noise level in an indoor and outdoor sites is very high and not suitable for teaching-learning processes. Therefore Acts and regulations concerning noise pollution should be strictly adopted.