Journal of Applied Engineering Sciences最新文献_第10页

Utilization of Rubber Powder of Waste Tyres in Foam Concrete 废轮胎胶粉在泡沫混凝土中的应用

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2019-05-01 DOI: 10.2478/jaes-2019-0011

Seengar Ali Mehrani, Imtiaz Ali Bhatti, Nabi Bux Bhatti, A. A. Jhatial, Mouzzam Ali Lohar

{"title":"Utilization of Rubber Powder of Waste Tyres in Foam Concrete","authors":"Seengar Ali Mehrani, Imtiaz Ali Bhatti, Nabi Bux Bhatti, A. A. Jhatial, Mouzzam Ali Lohar","doi":"10.2478/jaes-2019-0011","DOIUrl":"https://doi.org/10.2478/jaes-2019-0011","url":null,"abstract":"Abstract Foam concrete or light concrete has become increasingly recognizable in commercial and construction field. Foam concrete is not just light in its weight but also light in cost, as there is no coarse aggregate needed in its production. Application of foam concrete is limited due to the fact that it is not as strong as conventional concrete in terms of strength and rigidness. Therefore, this study is to investigate the potential of foam concrete incorporating with rubber powder of waste tire and admixture as an additive material to improve its strength and workability. Thus, the use of rubber powder in this study could enhance the strength by filling the voids in foam concrete. The amount of rubber powder added as additive in foam concrete is 0%, 5%, 10%, 15% and 20% respectively. The amount of plasticizers used is limited to less than 0.4% to the weight of cement. The mix design was set to achieve density of 1800kg/m3. The workability of foam concrete is decreasing as the percentage of rubber power was increasing. The foam concrete containing 5%of rubber powder has highest compressive strength with value of 20.6 MPa for 7 days water curing and 22.3 MPa for 28 days water curing. Significantly showing an increase of 1.7 MPa. The highest value of tensile strength for both air curing 7 and 28 days are 1.86 MPa and 1.97 MPa also held by 3% of rubber powder mix. As a conclusion the optimum rubber powder content to be used in foam concrete is 5% that gives the highest results in terms of workability and strength.","PeriodicalId":44808,"journal":{"name":"Journal of Applied Engineering Sciences","volume":"9 1","pages":"87 - 90"},"PeriodicalIF":1.1,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/jaes-2019-0011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46600356","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

The Comparison of Laboratory Tests and Numerical Analysis of Pressure and Tension Bearing Capacities of the New System of Microbulb and Micropile System on Clay in Shiraz, Iran 伊朗设拉子粘土微球新体系与微桩新体系压张承载力的室内试验对比及数值分析

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2019-05-01 DOI: 10.2478/jaes-2019-0008

Saeedeh Hakimian, M. Mosallanezhad

引用次数: 1

Effect of Micro Polypropylene Fibre on the Performance of Fly Ash-Based Geopolymer Concrete 微聚丙烯纤维对粉煤灰基地聚合物混凝土性能的影响

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2019-05-01 DOI: 10.2478/jaes-2019-0013

M. Rajak, B. Rai

{"title":"Effect of Micro Polypropylene Fibre on the Performance of Fly Ash-Based Geopolymer Concrete","authors":"M. Rajak, B. Rai","doi":"10.2478/jaes-2019-0013","DOIUrl":"https://doi.org/10.2478/jaes-2019-0013","url":null,"abstract":"Abstract Geopolymer offers significant promise to the construction world as a possible alternative to ordinary Portland cement (OPC). Like conventional Portland cement concrete, the matrix brittleness in geopolymer composites can be reduced by introducing suitable fibre reinforcement. A few investigations on fibre reinforced geopolymer composites are available. However there is still a gap to comprehend and enhance their performance. This paper describes the effect of incorporating micro polypropylene fibres on the strength and durability characteristics of geopolymer concrete. The engineering and durability properties like workability, compressive strength, split tensile strength, flexural strength, modulus of elasticity, and sorptivity of geopolymer concrete reinforced with micro polypropylene fibres is presented. The effect of the sulfuric acid attack on Geopolymer Concrete reinforced with micro polypropylene fibres is also discussed. The results show that hydrophobic characteristics of the micro polypropylene fibre led to weak contact with the geopolymer binder and hence weakened the mechanical performance of the fly ash based geopolymer matrix. However significant improvements in durability properties were noted.","PeriodicalId":44808,"journal":{"name":"Journal of Applied Engineering Sciences","volume":"9 1","pages":"108 - 97"},"PeriodicalIF":1.1,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48521061","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

Investigations of the Influence of Polystyrene Foamed Granules on the Properties of Lightweight Concrete 聚苯乙烯泡沫颗粒对轻量化混凝土性能影响的研究

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2019-05-01 DOI: 10.2478/jaes-2019-0002

S. K. Adhikary, Ž. Rudžionis, Marijus Zubrus

引用次数: 6

Role and Position of R&D Units in the Construction Management Industry 研发单位在建筑管理行业中的作用和地位

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2019-05-01 DOI: 10.2478/jaes-2019-0012

A. Momayez

{"title":"Role and Position of R&D Units in the Construction Management Industry","authors":"A. Momayez","doi":"10.2478/jaes-2019-0012","DOIUrl":"https://doi.org/10.2478/jaes-2019-0012","url":null,"abstract":"Abstract Today, research and development (R&D) indices are significant criteria for the development of countries. Therefore, the objective of the present study was to investigate the role and position of research and development units in construction industry from the perspective of construction management. The study is a descriptive survey research. The statistical population comprised the elite members and experts of research and development working in this field who were 81 individuals in total. The study employed Cronbach’s alpha to determine the reliability of the questionnaire. The study also exploited expert judgments of the elite members and experts of research and development in the construction industry to determine the validity of the questionnaire. For data analysis, the study deployed SPSS program. The findings reveal that the challenges existing in research and development centers are divided into the two groups of internal organizational problems and external organizational problems, and it is economically feasible to establish research and development units in the construction industry. In this regard, with a systematic view, the issue of research culture is proposed as the central point of the model.","PeriodicalId":44808,"journal":{"name":"Journal of Applied Engineering Sciences","volume":"9 1","pages":"91 - 96"},"PeriodicalIF":1.1,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42628835","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: 1

Thermal Comfort Modeling of a Church Heated with Static Heaters 静态加热器加热教堂的热舒适性建模

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2019-05-01 DOI: 10.2478/jaes-2019-0016

F. Țurcanu, Ana-Diana Ancaş, M. Profire, M. Verdeș, M. Balan

引用次数: 0

Technical-Economical Comparison Between Vertical Link Beam and Knee Brace Systems in Mid-Rise Steel Buildings 中高层钢结构建筑竖向连接梁与膝撑系统的技术经济比较

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2019-05-01 DOI: 10.2478/jaes-2019-0015

Mahmoud Sadeghpour

{"title":"Technical-Economical Comparison Between Vertical Link Beam and Knee Brace Systems in Mid-Rise Steel Buildings","authors":"Mahmoud Sadeghpour","doi":"10.2478/jaes-2019-0015","DOIUrl":"https://doi.org/10.2478/jaes-2019-0015","url":null,"abstract":"Abstract In knee brace and shear panel systems, unlike eccentric braced frames, energy absorption is achieved through plastic deformation when sub-members yield by shear forces or bending moments caused by bracing members during severe earthquakes. Several studies have been conducted on the behavior of these two systems which resulted in design methods to obtain the best structural performance. The present study attempted to design frames using these methods, and then to compare them in terms of technical and economic factors. In this regard, to obtain a pattern of the frames behavior, a 3-span 5-storey frame was modeled for three different types of brace system (coaxial, knee and shear panel) using ANSYS software. After performing pushover nonlinear static analysis, behavior coefficients were determined and the force-lateral displacement curves of the systems were compared. In the next step, 3-span 5- 8- and 12-storey frames were analyzed and designed using ETABS software and were compared in terms of the parameters such as relative lateral displacement, normal period of system, structural weight, and shear force into foundation. The results indicate that using the above-mentioned systems, structure will exhibit more ductility which leads to reduced design base shear. The forces applied to main structural members (beams, columns, and braces) are reduced by the use of knee brace and shear panel systems. This will affect the design and sometimes increases or decreases weight of these members.","PeriodicalId":44808,"journal":{"name":"Journal of Applied Engineering Sciences","volume":"9 1","pages":"115 - 120"},"PeriodicalIF":1.1,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49482743","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

Investigating the Effect of Aeration on the Flow Characteristics Around Under Pressure Tunnel Aerator Using Openfoam Open Source Software 利用Openfoam开源软件研究曝气对承压隧道式曝气器周围流动特性的影响

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2019-05-01 DOI: 10.2478/jaes-2019-0006

H. Ebrahimnezhadian, M. Manafpour

{"title":"Investigating the Effect of Aeration on the Flow Characteristics Around Under Pressure Tunnel Aerator Using Openfoam Open Source Software","authors":"H. Ebrahimnezhadian, M. Manafpour","doi":"10.2478/jaes-2019-0006","DOIUrl":"https://doi.org/10.2478/jaes-2019-0006","url":null,"abstract":"Abstract The flow around the ramp embedded in a pressurized tunnel is divided into the various zones immediately downstream of the ramp, including the cavity and the main zone of flow above the shear layer. The aeration coefficient of the flow from the lower surface (inside the cavity)(βlower) is a function of non-dimensional numbers which aerator geometry parameters such as cavity length to ramp height Lc/tr is considered as one of the most important parameters. Therefore, in the present study, OpenFOAM software and RNG k-ε turbulence model were used to simulate the flow to study the aeration effect on flow characteristics, so the range of aeration coefficient as 0%<β<10% for four ramps with different tr/d ratios is Applied, then by increasing the aeration coefficient in the range of 0%<β<16%, The dependency range of relative Cavity length Lc/tr to (β) was evaluated. In order to verify performance of the numerical model, experimental results of Manafpour test were used. The results of the research indicate that in the aeration of flow with aerator ramp, the height of ramp has more influence relative to ramp angle. Moreover the main Effectiveness of the aeration coefficient on the cavity length was limited to air percent less than 10%.","PeriodicalId":44808,"journal":{"name":"Journal of Applied Engineering Sciences","volume":"9 1","pages":"45 - 52"},"PeriodicalIF":1.1,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47700832","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

Effects of Fly Ash on Mechanical Properties of Concrete 粉煤灰对混凝土力学性能的影响

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2018-12-01 DOI: 10.2478/jaes-2018-0016

M. Zabihi‑Samani, S. Mokhtari, F. Raji

{"title":"Effects of Fly Ash on Mechanical Properties of Concrete","authors":"M. Zabihi‑Samani, S. Mokhtari, F. Raji","doi":"10.2478/jaes-2018-0016","DOIUrl":"https://doi.org/10.2478/jaes-2018-0016","url":null,"abstract":"Abstract Cement is a common and widespread building material over the world. Similarly, carbon dioxide emissions have been significantly increased due to cement production. Alternative low-carbon binders rather than cement have been progressively sought in recent years. Fly ash was found as an available option, since it is being largely disposed annually as a waste material. In this research several studies have been reviewed and recent applications of fly ash on concrete specification, including strength and fracture toughness of green concrete have been perused. Furthermore, transport properties of high volume fly ash after exposure to high temperature and influence of curing temperature on strength development of fly ash-recycled concrete aggregate blends have been investigated. The investigated test results showed that the properties of composites incorporating fly ash depend on the age of the concrete. Test results also revealed that transport properties of concrete increased notably after exposure to 400cº and the results achieved on fly ash-recycled concrete aggregate led to the conclusion that 15% FA is the optimum blend for road stabilization applications.","PeriodicalId":44808,"journal":{"name":"Journal of Applied Engineering Sciences","volume":"8 1","pages":"35 - 40"},"PeriodicalIF":1.1,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42079785","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: 15

The Use of Laser Scanning and Unmanned Aerial Vehicles in Construction Surveying in the Light of Legal Regulations in Poland 根据波兰法律法规，激光扫描和无人机在建筑测量中的使用

IF 1.1

Journal of Applied Engineering Sciences Pub Date : 2018-12-01 DOI: 10.2478/jaes-2018-0022

E. Puniach, A. Kwartnik-Pruc

{"title":"The Use of Laser Scanning and Unmanned Aerial Vehicles in Construction Surveying in the Light of Legal Regulations in Poland","authors":"E. Puniach, A. Kwartnik-Pruc","doi":"10.2478/jaes-2018-0022","DOIUrl":"https://doi.org/10.2478/jaes-2018-0022","url":null,"abstract":"Abstract Construction surveying consist in overall surveying works performed at every stage of the construction and use of a building structure. The surveyor participates in the processes of designing, direct implementation, maintenance and use, as well as demolition of a building structure. Advanced surveying techniques, such as laser scanning and UAV photogrammetry, are being increasingly used to perform the surveyor’s tasks. The aim of this research paper was to analyze the Polish legal regulations for the possibilities of applying the above-mentioned techniques to carry out the surveying works which are subject to the obligatory submission to public administration authorities. The primary focus was placed on the type of the works associated with construction surveying. The conducted research studies confirmed the lack of appropriate guidelines that would clearly define the scope and method of using laser scanning and UAV photogrammetry in construction surveying. At the same time, it was demonstrated that both these techniques of spatial data acquisition were sufficiently accurate to perform plane and vertical land surveys pursuant to the legal acts currently in force in Poland, and they can be used at selected stages of construction surveying. Finally, the authors proposed some solutions that would make it easier for the surveyors to use laser scanning and UAV photogrammetry in standard surveying works.","PeriodicalId":44808,"journal":{"name":"Journal of Applied Engineering Sciences","volume":"8 1","pages":"79 - 88"},"PeriodicalIF":1.1,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46775170","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