Electronic Journal of Structural Engineering最新文献_第5页

Abrasion and Strength of high percentage Graphene Oxide (GO) Incorporated Concrete 高比例氧化石墨烯混凝土的耐磨性和强度

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2022-05-31 DOI: 10.56748/ejse.2233001

D. Mohotti, P. Mendis, K. Wijesooriya, I. Fonseka, D. Weerasinghe, C-K. Lee

{"title":"Abrasion and Strength of high percentage Graphene Oxide (GO) Incorporated Concrete","authors":"D. Mohotti, P. Mendis, K. Wijesooriya, I. Fonseka, D. Weerasinghe, C-K. Lee","doi":"10.56748/ejse.2233001","DOIUrl":"https://doi.org/10.56748/ejse.2233001","url":null,"abstract":"Incorporating Graphene Oxide (GO) in concrete composite has been a good alternative to Pristine Graphene due to its hydrophilic nature and its ability to readily disperse in water the consequent cementitious mix. The addition of GO to the cementitious mix has been found to enhance mechanical properties. This paper aims to assess the abrasion resistance of GO incorporated concrete for its application in road pavement design. Experiments for strength in terms of compression, workability in terms of slump and abrasion resistance in accordance with ASTM-C418-20 using a sand-blasting rig are presented in the paper. It is shown that the addition of GO at percentages between 0% to 0.08% (to cement weight ratio), the compressive strength improves by 39% and 26% at 7 days and 28 days, respectively. The addition of GO consequently affected the workability where it was found that the addition of polycarboxylate ether (PCE) (superplasticisers) can drastically improve the workability, which is essential in practical applications. The abrasion was measured for specimens prepared with a high GO percentage between 0.1% to 0.3% and measured at 7 days and displayed a reduction of 70% of abraded volume at 0.3% GO. Finally, the study presents the benefits of using GO where the reduced amount of cement usage will consequently lead to sustainable concrete construction.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48068377","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: 2

Wind Design of Tall Buildings: The State of the Art 高层建筑的风设计:艺术的现状

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2022-05-31 DOI: 10.56748/ejse.2233101

Yousef Abu-Zidan, P. Mendis, Tharaka Gunawardena, D. Mohotti, S. Fernando

引用次数: 4

Location of Semi-Rigid Connection Effect On The Seismic Performance of Steel Frame Structures 半刚性连接位置对钢框架结构抗震性能的影响

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2021-12-28 DOI: 10.21203/rs.3.rs-1183780/v1

E. Elhout

引用次数: 0

Dynamic response of cracked concrete rehabilitated with composites 复合材料修复裂缝混凝土的动力响应

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2021-11-30 DOI: 10.56748/ejse.21286

Shifana Fatima Kaafil

引用次数: 0

Compressive Strength of Ternary Blended Geopolymer Concrete Composites 三元共混地聚合物混凝土复合材料的抗压强度

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2021-11-30 DOI: 10.56748/ejse.21287

R.Kumutha, K.Vijai, S.K.Vinu

{"title":"Compressive Strength of Ternary Blended Geopolymer Concrete Composites","authors":"R.Kumutha, K.Vijai, S.K.Vinu","doi":"10.56748/ejse.21287","DOIUrl":"https://doi.org/10.56748/ejse.21287","url":null,"abstract":"Use of industrial wastes as supplementary concreting materials in the manufacturing of concrete is very vital at present to obtain a sustainable environmental solution. Some of the commonly used pozzolanic materials are Fly ash, Ground Granulated Blast Furnace Slag (GGBS), Silica Fume and Rice Husk Ash (RHA) etc. In the present experimental investigation, the compressive strength property of ternary blended geopolymer concrete has been studied by considering Fly ash, Ground Granulated blast furnace slag (GGBS) and Rice Hush Ash (RHA) in various percentages as source materials for geopolymerisation. The source materials were activated with alkaline activators consisting of a combination of Sodium Hydroxide (NaOH) & Sodium Silicate (Na2SiO3) solutions with the concentration of NaOH being 10 molarity (10M). For various combinations of Fly ash, Rice Husk ash and GGBS the compressive strength for 7 days and 28 days were determined experimentally. From the test results, it has been found that as the GGBS content increases, the compressive strength of the concrete also increases whereas, as the content of RHA increases, the density and compressive strength of the concrete decreases. The optimum combination was found to be F60 G30 R10 and F70 G20 R10 for which the compressive strength of the concrete is 34.67 MPa and 24.87 MPa which can be used in applications where M30 and M20 grades of concrete are required. The density of F60 G30 R10 GPC is 2320 kg/m3 which is lesser than conventional concrete. It is also found that usage of 90% of rice husk ash in geopolymer concrete is not at all effective. The obtained compressive strengths are in the range of 10 MPa to 34.0 MPa which depends on the ratio of GGBS to RHA. Proper consumption of the RHA contributes in solving the environmental pollution and also to improve the environmental friendliness of concrete to make it suitable as a green building material.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43932683","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

The effect of temperature expansion on cracking behavior of slabs 温度膨胀对板坯开裂行为的影响

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2021-11-30 DOI: 10.56748/ejse.21293

Ahmad Moradpour, H. Babaali

引用次数: 0

Condition Assessment of a Reinforced Concrete Residential Building using Non-destructive Testing Methods - A Case Study 用无损检测方法对某钢筋混凝土住宅建筑进行状态评估——一个案例研究

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2021-11-30 DOI: 10.56748/ejse.21288

M. Rath

{"title":"Condition Assessment of a Reinforced Concrete Residential Building using Non-destructive Testing Methods - A Case Study","authors":"M. Rath","doi":"10.56748/ejse.21288","DOIUrl":"https://doi.org/10.56748/ejse.21288","url":null,"abstract":"The present study deals with both experimental and numerical investigation on buckling effects of laminated composite plates subjected to varying temperature and moisture. A simple laminated plate model is developed for the buckling of composite plates subjected to adverse hygrothermal loading. A computer program based on FEM in MATLAB environment is developed to perform all necessary computations. The woven fiber Glass/Epoxy specimens were hygrothermally conditioned in a humidity cabinet where theconditions were maintained at temperatures of 300K-425K and relative humidity (RH) ranging from 0-1% for moisture concentrations. All the investigations are made with a symmetric cross-ply laminates. The present study deals with both experimental and numerical investigation on buckling behavior of laminated composite plates subjected to varying temperature and moisture concentration. Quantitative results are presented to show the effects of geometry, material and lamination parameters of woven fiber laminate onbuckling of composite plates for different temperature and moisture concentrations with simply supported boundary conditions with different aspect and side-to-thickness ratios. Experimental results show that there is reduction in buckling loads in KN with the increase in temperature and moisture concentration for laminates with clamped-free-clamped-free boundary conditions","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42824174","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

Engineering Properties and Prediction of Strength of High Performance Fibre Reinforced Concrete using Artificial Neural Networks 基于人工神经网络的高性能纤维混凝土工程性能及强度预测

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2021-11-30 DOI: 10.56748/ejse.21294

P. Ramadoss, N. Prabath

{"title":"Engineering Properties and Prediction of Strength of High Performance Fibre Reinforced Concrete using Artificial Neural Networks","authors":"P. Ramadoss, N. Prabath","doi":"10.56748/ejse.21294","DOIUrl":"https://doi.org/10.56748/ejse.21294","url":null,"abstract":"ABSTRACT: This paper presents the experimental and numerical studies on high performance fiber concrete (HPFRC) with water-cementitious materials (w/cm) ratios of 0.4- 0.3, steel fiber volume fraction (Vf) varying from 0- 1.5%, polypropylene fiber volume fraction varying from 0- 1% and silica fume replacement at 10% and 15%. Experimental results showed high improvements in 28 day cylinder compressive strength and flex-ural strength of steel fiber reinforced concrete at fiber volume fraction of 1.5%; for polypropylene (PP) FRC improvement in compressive and flexural strengths are marginal and moderate, respectively. Statistical models developed for compressive strength ratios and flexural strength ratios of HPSFRC indicate the prediction ca-pabilities of the models. Due to the complex mix proportions of HPSFRC and the non-linear relationship be-tween the concrete mix proportions and properties, research on HPSFRC has been empirical and no models with reliable predictive capabilities for its behavior have been developed. Based on the large data collected for HPSFRC mixes, a trained artificial neural network (ANN) model which adopts a back propagation algorithm to predict 28-day compressive strength of HPSFRC mixes was employed. This paper describes the comparison of the experimental results obtained for various mixes. Multiple linear regression (MLR) model with R2 = 0.78 was also developed for the prediction of compressive strength of HPSFRC mixes. On validation of the data sets by NNs, the error range is within 2% of the actual values. ANN models give the significant degree of ac-curacy compared to MLR model, and can be easily used to estimate the strength of concrete mixes.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47420122","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: 3

Zoning of mutual influence of approach rock tunnels based on a safety factor 基于安全系数的巷道相互影响分区

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2021-11-30 DOI: 10.56748/ejse.21290

Chao KONG, Xinqiang Gao

{"title":"Zoning of mutual influence of approach rock tunnels based on a safety factor","authors":"Chao KONG, Xinqiang Gao","doi":"10.56748/ejse.21290","DOIUrl":"https://doi.org/10.56748/ejse.21290","url":null,"abstract":"For multiple approach tunnels, the construction of the new tunnel near the existing tunnel modifies the state of stresses and movements around the existing tunnel in an area called the “influence zone”. In this study, new method is developed to optimize the relative position of approach tunnels and guide their design via the zoning of mutual influence of the approach tunnels based on a safety factor. The strength reduction method is applied to calculate the global safety factor of multiple approach tunnels in limit state. According to quantitative laws of variation in the safety factor from single tunnel to multiple tunnels, the strong influence, weak influence, and no influence have been zoning to guide the design and construction of approach tunnels. By changing the relative position of the new tunnel complex, the safety factor and failure shapes of the tunnel complex in several cases are obtained through numerical simulation. The results are based on dividing the influence zone of approach construction of the new tunnel complex. Combining the influence zone with failure shapes, the relative position of the tunnel complex is optimized. Special support countermeasures for weak tunnel complex parts and parameters of support are initially determined.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48125535","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

Application of Multi-Criteria Decision-Making in Achieving the Right Mix Asphalt Mixtures 多准则决策在沥青混合料合理配比中的应用

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2021-11-30 DOI: 10.56748/ejse.21291

A. A. Rassafi, M. Zarei, A. Dadashi

引用次数: 2