Open Engineering最新文献_第4页

Finite element analysis for built-up steel beam with extended plate connected by bolts 螺栓连接扩展板组合钢梁有限元分析

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0482

Ahmed Ajel Ali, Luay Mohammed Al-Shather, Hayder Mahdi Abdul-Jawad

引用次数: 0

Feasibility studies and their effects on the success or failure of investment projects. “Najaf governorate as a model” 可行性研究及其对投资项目成败的影响。“纳杰夫省的典范”

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0467

Bashar Rasheed M. Alhamami, Yasser Sahib Nassar, Laith Mashkoor Rasheed Qendeel

{"title":"Feasibility studies and their effects on the success or failure of investment projects. “Najaf governorate as a model”","authors":"Bashar Rasheed M. Alhamami, Yasser Sahib Nassar, Laith Mashkoor Rasheed Qendeel","doi":"10.1515/eng-2022-0467","DOIUrl":"https://doi.org/10.1515/eng-2022-0467","url":null,"abstract":"Abstract A feasibility study is considered a strategic tool, a critical principle, and an essential stage of the success of the investment project, and it is regarded as an essential point in the success or failure of the investment project. Therefore, feasibility studies are among the most critical elements of the success of investment projects. The purpose of this study is to find out the reality of the feasibility study in the various departments of the state and its impact on the success or failure of investment projects, in addition to studying, identifying, and analyzing the factors that affect the feasibility study in investment projects. In this research, 23 influential factors were collected from site surveys, interviews with engineers and experts, and previous research in the Arab world. These factors are grouped into five categories: political and legal aspects, economic and financial, consultancy, owner, and contractor. A questionnaire survey of 70 respondents was distributed among different experts. A statistical analysis was done using SPSS and Excel packages. The results accomplished from the survey revealed the significant factors that affect the feasibility study (ranked respectively), namely, the absence of a clear investment policy (86%), the existence of obstacles (85.71%), slow and complicated routine procedures (84%), lack of experience and field knowledge (82.29%), and failure to accurately meet the scientific (79.71%) These findings could help the construction professionals to improve the feasibility study and project performance in Iraq.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135839438","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

Optimizing and coordinating the location of raw material suitable for cement manufacturing in Wasit Governorate, Iraq 优化和协调伊拉克Wasit省适合水泥生产的原材料位置

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0486

Alaa Kharbat Shadhar, Buroog Basheer Mahmood, Aqeel Abboud Abdulhassan, Ahmed Mohammed Raoof Mahjoob, Mohammed S. Shamkhi

{"title":"Optimizing and coordinating the location of raw material suitable for cement manufacturing in Wasit Governorate, Iraq","authors":"Alaa Kharbat Shadhar, Buroog Basheer Mahmood, Aqeel Abboud Abdulhassan, Ahmed Mohammed Raoof Mahjoob, Mohammed S. Shamkhi","doi":"10.1515/eng-2022-0486","DOIUrl":"https://doi.org/10.1515/eng-2022-0486","url":null,"abstract":"Abstract The cement industry is considered one of the strategic industries, because it is directly related to construction work and cement is used as a hydraulic binder. However, it is a simple industry compared to major industries and depends on the availability of the necessary raw materials. This study focuses on optimizing and coordinating the location of raw materials needed for the cement manufacturing in Wasit Governorate in Iraq. Field works include detailed reconnaissance, topographic work, and description and sampling of 24 lithological sections that represent the carbonate deposits, which crop out in the area. The investigated area has the following specifications: The weighted averages of chemical components in the industrial bed are as follows: CaO = 47.83%, MgO = 1.12%, SiO 2 = 7.28%, SO 3 = 0.34%, Fe 2 O 3 = 1.85%, Al 2 O 3 = 1.85%, L.O.I = 39.26%, Na 2 O = 0.29%, and K 2 O = 0.38%. The average thickness of the investigated raw materials is 15.68 m. The average bulk density of the investigated raw materials is 2.32 g/cm 3 . The compressive strength of the investigated raw materials ranges from 6.182 to 55.21 MN/m 2 . The positive area is 922,552 m 2 . The volume of the industrial bed is 14,466,242 m 3 . The economic reserve of the industrial bed is 33,561,682 tons.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135844944","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

Improving the fatigue life of composite by using multiwall carbon nanotubes 利用多壁碳纳米管提高复合材料的疲劳寿命

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0490

Ibaa M. H. Zwain, Ali Sadiq Alithari

{"title":"Improving the fatigue life of composite by using multiwall carbon nanotubes","authors":"Ibaa M. H. Zwain, Ali Sadiq Alithari","doi":"10.1515/eng-2022-0490","DOIUrl":"https://doi.org/10.1515/eng-2022-0490","url":null,"abstract":"Abstract The fatigue life of polymer materials like epoxy can be improved by using stiffeners such as carbon fiber and/or adding multiwall carbon nanotubes (MWCNTs). This article studies the effect of adding MWCNTs with different ratios (0.5, 1, and 2 wt%) to epoxy and composite (epoxy + 30% carbon fibers). The experimental results of the fatigue test with fully reversed bending stress (with R = −1) showed a maximum increase of 788% in fatigue life when adding 1 wt% MWCNTs to epoxy, while the maximum improvement ratio reaches 2,500% when adding 1 wt% MWCNTs to composite. The best results of fatigue life improvement were observed for samples with MWCNTs of 1 wt%. The material will be transferred from low cycle fatigue (less than 10 5 cycles) to high cycle fatigue (more than 10 5 cycles) by adding 1 wt% of MWCNTs. At the same time, the ratio of MWCNTs of more than 1 wt% (such as 2 wt%) will decrease the fatigue life due to the agglomeration of nanotubes inside the resin and reduce the positive effect of it. These agglomeration points work as a barrier to load transfer and stress concentration points. The numerical model was built to simulate the fatigue test and compare the results with the experimental with a discrepancy value of 7.5%.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136002838","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

Improvement in the California bearing ratio of subbase soil by recycled asphalt pavement and cement 再生沥青路面与水泥对基层土加州承载力的改善

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0449

Rasha A. Al-Fatlawy, Tawfek Sheer Ali, Mohammed K. Fakhraldin, Nibras A. Hussain, Ibtihal Y. Abd

{"title":"Improvement in the California bearing ratio of subbase soil by recycled asphalt pavement and cement","authors":"Rasha A. Al-Fatlawy, Tawfek Sheer Ali, Mohammed K. Fakhraldin, Nibras A. Hussain, Ibtihal Y. Abd","doi":"10.1515/eng-2022-0449","DOIUrl":"https://doi.org/10.1515/eng-2022-0449","url":null,"abstract":"Abstract As the subbase layer is one of the important layers in road construction, it is necessary to use a granular material to resist traffic loads. Usually, granular soil with a good gradation is used, which is determined by most road design codes. Sometimes it is needed to improve the properties of this soil by adding materials such as cement, which is considered a high-cost material, so it is necessary to search for low-cost materials. One of these materials is recycled asphalt pavement (RAP). Herein, we presented an experimental study to investigate using RAP and cement in roadway subbase material improvement. The indicator of the improvement has been selected as the California bearing ratio (CBR); many laboratory tests were made for many percentages of cement and RAP. The study’s main conclusions are that the CBR value increases when the cement percentage increases and the RAP percentages increase up to 12% by the mass of the virgin subbase and then decrease. Also, using a mix of 12% RAP and 1% cement blended with the subbase material gives a CBR value of 138.6. This improvement is considered the same as using 6% (133.5) cement but it is of low cost due to the low cost of the waste material (RAP) as it saved the high cost of 5% cement.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"410 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136003668","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

Some properties of thermal insulating cement mortar using Ponza aggregate Ponza骨料保温水泥砂浆的一些性能研究

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0478

Rania Amer Fattah, Basil S. Al-Shathr, Suhair K. Abed

{"title":"Some properties of thermal insulating cement mortar using Ponza aggregate","authors":"Rania Amer Fattah, Basil S. Al-Shathr, Suhair K. Abed","doi":"10.1515/eng-2022-0478","DOIUrl":"https://doi.org/10.1515/eng-2022-0478","url":null,"abstract":"Abstract Lightweight aggregate (LWA) mortar is made using lightweight or low-density aggregate, which improves properties such as thermal insulation, durability for freezing and thawing, fire and temperature resistance, and sound insulation. This research aims to use lightweight fine aggregate obtained from crushing natural rocks that are locally called “Ponza” to produce LWA mortar with different mix proportions to study the possibility of using it to produce blocks that can be erected on the outer side of the walls of old buildings to provide good thermal insulation. It also presents a study about the internal curing property of the produced cement mortar, which comes from the absorbed water by the used surface-saturated dry Ponza aggregate. The process includes using three mix proportions (1:1, 1:0.7, and 1:0.5) by weight of cement: fine aggregate. The samples were cured by dividing them into five groups, including moist curing for 1, 3, 7, and 28 days and the fifth group was moist cured for 1 day and then covered by a thin layer of flan coat. Dry density, compressive strength, flexural strength, and thermal conductivity for ages (7, 28, and 56 days) have been tested. The findings indicate that it is possible to produce thermal insulating lightweight cement mortar with mixtures of 1:0.7 or 1:0.5 cement to LWA, using Ponza aggregate, since the results showed an acceptable range of compressive and flexural strengths reaching about 14.75 and 2.91 MPa, respectively, a bulk density of less than 1,600 kg/mm 3 , and a lower thermal conductivity than many building materials.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136004925","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

Numerical and experimental analysis of the heat transfer process in a railway disc brake tested on a dynamometer stand 铁路盘式制动器在测功机架上的传热过程的数值与实验分析

IF 1.7

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0466

A. Wolff, Jacek Kukulski

引用次数: 0

Experimental investigation of electrode wear assessment in the EDM process using image processing technique 基于图像处理技术的电火花加工过程中电极磨损评估实验研究

IF 1.7

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0399

A. A. Khleif

引用次数: 0

Assessment for behavior of axially loaded reinforced concrete columns strengthened by different patterns of steel-framed jacket 不同钢框架夹套加固钢筋混凝土轴心受压柱的性能评估

IF 1.7

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0414

M. Shhatha, W. H. Mahdi, Ahmed A. Alalikhan

{"title":"Assessment for behavior of axially loaded reinforced concrete columns strengthened by different patterns of steel-framed jacket","authors":"M. Shhatha, W. H. Mahdi, Ahmed A. Alalikhan","doi":"10.1515/eng-2022-0414","DOIUrl":"https://doi.org/10.1515/eng-2022-0414","url":null,"abstract":"Abstract Rehabilitation, upgrading, or strengthening of structural members, especially columns, has become the target of many researchers because columns are the most important members in a building and the failure of columns causes direct collapse in the building. This study aims to get an assessment of the best pattern of steel-framed jacket used for strengthening axially loaded concrete columns by numerically studying the behavior of the column for different cases of the same amount of steel jacket. The jacket consists of four angles and/or battens, lacings, or battens with lacings. The nonlinear analysis program designated as ARCC-SSJ (Analysis of Reinforced Concrete Columns Strengthened by Steel Jacket) is used to compare different patterns with the same and different cross-sections of battens and single lacing, as well as battens and lacing with battens taken into account. It is found that lacing with battens is the best pattern for the same amount of steel jacket with different cross-sectional areas. It is observed that the load-carrying capacity of the column increased by approximately 1.8 and 1.15% over that of battens alone in the case of a lacing angle of 60.83 2 ∘ 60.83{2}^{circ } and 74.40 7 ∘ 74.40{7}^{circ } with the vertical axis of the column, respectively.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43872482","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

Activated carbon from sugarcane as an efficient adsorbent for phenol from petroleum refinery wastewater: Equilibrium, kinetic, and thermodynamic study 甘蔗活性炭作为炼油废水中苯酚的高效吸附剂:平衡、动力学和热力学研究

IF 1.7

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0442

M. S. Abdulrahman, Alanood A. Alsarayreh, S. A. Barno, Mervat A. Abd Elkawi, A. Abbas

引用次数: 0