Open Journal of Civil Engineering最新文献_第8页

Comparative Physico Mechanical Study of Cements CEM II 42.5R in Cameroon: Case of DANGOTE and CIMENCAM 喀麦隆水泥cem22.5 r的比较物理力学研究:DANGOTE和CIMENCAM的案例

Open Journal of Civil Engineering Pub Date : 2019-02-20 DOI: 10.4236/OJCE.2019.91002

T. A. Biyindi, Fabrice Kwefeu Mbakop, Eric Toumi, Belmondo Woumbeng Etonleu, Joseph Pondi

引用次数: 2

Effects of Adding Boron Compounds to Glycol Based Grinding Aids on Cement Compressive Strengths Performance 二醇基助磨剂中添加硼化合物对水泥抗压强度的影响

Open Journal of Civil Engineering Pub Date : 2019-02-20 DOI: 10.4236/ojce.2019.91003

Murat Çallı, E. Pehlivan

引用次数: 0

Optimization of the Bitumen Content of a Basaltic Semi-Granular Bituminous Concrete 玄武岩半颗粒沥青混凝土掺量的优化研究

Open Journal of Civil Engineering Pub Date : 2018-12-03 DOI: 10.4236/ojce.2018.84032

Souleymane Mbengue, D. Sow, I. Cissé

{"title":"Optimization of the Bitumen Content of a Basaltic Semi-Granular Bituminous Concrete","authors":"Souleymane Mbengue, D. Sow, I. Cissé","doi":"10.4236/ojce.2018.84032","DOIUrl":"https://doi.org/10.4236/ojce.2018.84032","url":null,"abstract":"Various studies have been conducted in the past by researchers who have proposed diverse solutions to control the premature degradation noted on flexible pavements. It turns out that the binder content remains a parameter so far not mastered and its optimization remains an imperative to produce a quality mix capable of meeting the technical and economic requirements sought in a formulation study. This article mainly aimed to optimize the hydrocarbon binder content of a 0/14 granular class semi-granular bituminous concrete using the Marshall and Duriez method. In the first part of the study, the different constituents were characterized according to the standards in force. The second allowed to describe the methodology used to determine the mixture and calculated the theoretical binder content. A theoretical mixture, entering the reference zone was defined at first. Following the characterization of the mixture in the laboratory, the granulometry curve of the mixture was inserted into the reference zone. This mixture was then preserved for the rest of the study. Then, it was theoretically determined bitumen contents ranging from 5.13% to 5.75% for wealth modules ranging from 3.3% to 3.7%. Thus, the Marshall method was used to characterize the performance of the mixture as a function of the binder content. The results obtained led to the selection of two grades of binders 5.13% and 5.28% for the study of water resistance using the Duriez method. On the basis of the results obtained on the Duriez test, the mixture with a binder content of 5.28% satisfies a good part of the criteria selected. This content corresponds to a wealth module of 3.4%.","PeriodicalId":302856,"journal":{"name":"Open Journal of Civil Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132033626","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

Dynamic Analysis of Soil Structure Interaction Effect on Multi Story RC Frame 多层钢筋混凝土框架土-结构相互作用动力分析

Open Journal of Civil Engineering Pub Date : 2018-11-05 DOI: 10.4236/OJCE.2018.84030

Hailu Getachew Kabtamu, Gang Peng, Denghong Chen

{"title":"Dynamic Analysis of Soil Structure Interaction Effect on Multi Story RC Frame","authors":"Hailu Getachew Kabtamu, Gang Peng, Denghong Chen","doi":"10.4236/OJCE.2018.84030","DOIUrl":"https://doi.org/10.4236/OJCE.2018.84030","url":null,"abstract":"In this study dynamic analysis of Soil Structure Interaction (SSI) effect on multi story reinforced concrete (RC) frame founded on soft soil (flexible base) is made and compared with fixed base. Two model 2D RC frames with 7 and 12 story are selected for analysis. Winkler Spring and half space direct method models are used for flexible base for the frames founded on two types of soft soils with shear velocity Vs < 150 m/s Asper Seismic Codes of Chinese GB50011-2010 Soil IV and Ethiopian ES8-2015 soil D. The frames are subjected to strong ground motion matched to response spectrums of soft soil of Chinese GB50011-2010 and Ethiopian ES8-2015 for linear time history analysis. The dynamic analysis result shows Spring and Fixed base mass participation 90% reaches in 2 or 3 modes but in direct method 11 to 30 modes for story 12 and 7 respectively. However, both flexible base models have bigger fundamental period of vibration and inter story drift but smaller base shear than fixed base. In addition, within the flexible base models the inter-story drift, second order effect (P-Δ) and Story shear distribution are different along the height of frames. The spring model shows larger Story drift and second order effect (P-Δ) at the bottom of Story for both soft soils types. On the other hand, half space direct method model indicates value reverse to spring model; it gives bigger Story drift and P-Δ effect in the top stories than fixed base. Finally, this study concludes that base shear reduction due to SSI may not be always beneficial. Because the gravity load is constant in both fixed and flexible bases that cause bigger P-Δ effect at the bottom stories due to increase, inter story drift and decrease story shear in flexible base.","PeriodicalId":302856,"journal":{"name":"Open Journal of Civil Engineering","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114259031","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: 11

Effect of Iron Powder (Fe 2 O 3 ) on Strength, Workability, and Porosity of the Binary Blended Concrete 铁粉(fe2o3)对二元拌合混凝土强度、和易性和孔隙率的影响

Open Journal of Civil Engineering Pub Date : 2018-11-02 DOI: 10.4236/OJCE.2018.84029

Moussa Anan Largeau, R. Mutuku, J. Thuo

{"title":"Effect of Iron Powder (Fe 2 O 3 ) on Strength, Workability, and Porosity of the Binary Blended Concrete","authors":"Moussa Anan Largeau, R. Mutuku, J. Thuo","doi":"10.4236/OJCE.2018.84029","DOIUrl":"https://doi.org/10.4236/OJCE.2018.84029","url":null,"abstract":"In this study, the effect of iron powder (Fe2O3) on the compressive strength, tensile strength, workability, and porosity of the binary blended concrete were experimentally investigated. For this purpose, Portland cement was partially replaced by 1.5%, 2.5%, 3.5%, and 5% by weighing of iron powder. The amount of water-binder-ratio was considered constant. The workability of the fresh composite concrete was determined using cone Abrams method; mechanical properties were determined included compressive and tensile strengths at 7, 14, and 28 days and durability evaluated by water absorption and permeable porosity. It was observed that the compressive and tensile strengths change with the replacement of iron powder by up to 5%. However, the maximum improvement was gained at 2.5 wt% for compressive strength and 1.5 wt% for tensile strength. The workability of the fresh mixtures decreased when iron powder amount increased. It was observed that the porosity decreased respectively by 21.88% and 26.77% at 1.5 wt% and 2.5 wt% replacement. Moreover, this present study shows the importance and benefits to improve concrete properties by using micro-particles materials.","PeriodicalId":302856,"journal":{"name":"Open Journal of Civil Engineering","volume":"577 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131847353","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: 7

Monitoring and Identification of the Seismically Isolated “Our Lady of Tears” Shrine in Syracuse 锡拉丘兹地震隔离“眼泪圣母”神殿的监测与鉴定

Open Journal of Civil Engineering Pub Date : 2018-10-24 DOI: 10.4236/ojce.2018.84028

D. Losanno, M. Spizzuoco

引用次数: 0

Experimental Investigation of Lime Treated Palm Kernel Shell and Sugarcane Bagasse Ash as Partial Replacement of Coarse Aggregate and Cement Respectively in Concrete 石灰处理棕榈仁壳和蔗渣灰在混凝土中分别部分替代粗骨料和水泥的试验研究

Open Journal of Civil Engineering Pub Date : 2018-10-23 DOI: 10.4236/ojce.2018.84027

Mahfouz O. A. Djima, G. Mang’uriu, J. Mwero

引用次数: 6

Compressive Behavior of Steel Members Reinforced by Patch Plate with Welding and Bonding 焊接粘结贴片加固钢构件的抗压性能

Open Journal of Civil Engineering Pub Date : 2018-10-09 DOI: 10.4236/OJCE.2018.84026

Xiaoyan Liu, M. Hirohata

引用次数: 6

Seismic Performances of Mountainous Continuous Rigid Frame Solid and Hollow Pier Railway Bridges 山地连续刚构实心空心墩铁路桥梁抗震性能研究

Open Journal of Civil Engineering Pub Date : 2018-10-09 DOI: 10.4236/ojce.2018.84035

Akhil Subedi, Gopal S. Bhandari, Paribesh Parajuli

引用次数: 0

An Evaluation of the Water Absorption and Density Properties of Expanded Polystyrene Sanded Concrete 膨胀聚苯乙烯砂混凝土吸水性能和密度性能的评价

Open Journal of Civil Engineering Pub Date : 2018-10-09 DOI: 10.4236/ojce.2018.84037

J. Abah, E. Ndububa, E. Ikpe

{"title":"An Evaluation of the Water Absorption and Density Properties of Expanded Polystyrene Sanded Concrete","authors":"J. Abah, E. Ndububa, E. Ikpe","doi":"10.4236/ojce.2018.84037","DOIUrl":"https://doi.org/10.4236/ojce.2018.84037","url":null,"abstract":"In this paper, the evaluation of the mechanical and hygro-thermal properties of expanded polystyrene-sanded lightweight concrete (EPSLC) was examined. Evaluated are the mechanical properties in terms of density; and the hygro-thermal property using water absorption (capillary absorption and total immersion) as measures. The research used 30% volume of EPS to replace natural coarse aggregate to produce a lightweight concrete, which is expected to be economical, serviceable and meet the required standards for lightweight concretes. The concrete bulk and oven dry densities were obtained as 1789 KN/m3 and 1674 kg/m3 respectively, while the total water and capillary water absorption increases with time of suction. The high rate of water absorption at the early periods of the test has corresponding capillary coefficient of steep slope within the same period. The relationship between the variables Q the water absorption per unit area of the specimen and K the capillary coefficient, is that as the water absorption gets higher, so does the capillary coefficient and the percentage of the variation is expressed by the correlation coefficient R2. Therefore, the values of R2 as depicted in the graphs shows a high percentage of variation. The moisture capacity is 6.9%. All the laboratory tests were, conducted in accordance with standard codes of practice. The significance of the research is that innovative technology is employed to modify and improve processes in construction industry, thus, enhancing sustainable environmental, management of industrial waste, and cheaper and economic construction. With the 30% replacement of coarse aggregate, the density and water absorption properties of concrete produced are within acceptable limits. Therefore, EPS can be used to produce lightweight concrete that will perform the required function at this level of replacement.","PeriodicalId":302856,"journal":{"name":"Open Journal of Civil Engineering","volume":"351 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133911123","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