Sensitivity Analysis and A Mathematical Model to Determine The optimum Bitumen Content in Stone Matrix Asphalt
P.
Eslami Shahrebabaki
M.Sc. Student, Department of Civil Eng., Yazd University, Yazd, Iran
author
H.
Khani Sanij
Assistant Prof., Department of Civil Eng., Yazd University, Yazd, Iran
author
M. M.
Khabiri
Associate Prof., Department of Civil Eng., Yazd University, Yazd, Iran
author
text
article
2017
per
Currently in Iran, the mixing design of stone matrix asphalt mixtures is carried out according to the Marshall method. In Marshall mixing design, the optimum bitumen percentage is determined based on the average amount of the bitumen that leads to the highest Marshall Stability, the highest Specific gravityand the most suitable void percentage in asphalt mixtures with stone matrix asphalt. It doesn’t mean that this bitumen percentage is necessarily the optimum percentage. In this paper, a mathematical model has been developed to determine the optimum bitumen content in stone matrix asphalt by Marshall method, For this purpose, first equations of effective parameters changes in bitumen mix design SMA toward bitumen percent are determined by least squares method and approximating a quadratic polynomial and then relying on these equations and using a multi-purpose mathematical model, optimum bitumen percent is determined in a way that asphalt combination would have all conditions in the code and also would have maximum Marshal stability, the haighest specific gravity and the most appropriate void percentage. After obtaining optimum bitumen content, sensitivity analysis toward very low bitumen percentage on effective parameters (marshall stability, bulk specific gravity of mix asphalt, voids of mix asphalt and voids of aggregate) were done in mix design of stone matrix asphalt. The results of this study indicate that the method of mathematical modeling is more accurate than the traditional method, and sensitivity analysis also showed the effect of error rate on optimum bitumen determination.
Road
مرکز تحقیقات راه، مسکن و شهرسازی
1735-062X
25
v.
93
no.
2017
1
20
https://road.bhrc.ac.ir/article_55199_8b146d60088f0569c4f26b15e77c5aae.pdf
Review of Pavement Performance Prediction Models
P.
Bagherian
Postgraduate student, School of Civil Engineering, Collage of Engineering, University of Tehran, Iran.
author
K.
Aghabayk
Assistant professor, School of Civil Engineering, Collage of Engineering, University of Tehran, Iran.
author
text
article
2017
per
Road networks and in particular their Pavements are the fundamental components of a transportation infrastructure. Pavements need continuous maintenance. Allocation of sufficient funds for maintenance of pavements is an important process of pavement management systems. Importance of a modern and efficient pavement management system is evident, specially, for countries, where most transfers are done through road transportation networks. Capability of estimating future pavement performance based on existing condition and presenting preventive operations are most important criterion of an efficient pavement management system. There is always an optimal time for M&R operations. Distresses progression rate and M&R costs will be increased, in case of no action at this optimal time. Pavement performance prediction models are the best tool for determination of this time. In this paper, pavement performance prediction models will be introduced and compared with each other. Their exact comparison is discussed, by investigation models prediction accuracy, efficiency, calibration criteria and database and features needed.
Road
مرکز تحقیقات راه، مسکن و شهرسازی
1735-062X
25
v.
93
no.
2017
13
21
https://road.bhrc.ac.ir/article_55200_9fbf14aa952cc702006424aea11f81e1.pdf
Field Study of the Relationship between Water Absorption of Limestone Aggregates and Asphalt Stripping Damage
Gh.R.
Tadayonfar
Assistant Professor , Department of Civil Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran
author
A.A.
Sadeghi
Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran.
author
H.
Valehi
M.Sc., Student, Department of Civil Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran.
author
text
article
2017
per
The durability of asphalt pavements against environmental and traffic factors are closely related to the type of consumed materials. Also, adhesion of bitumen to aggregates is also very effective in the quality and durability of the implemented pavement which is related to the characteristics of aggregates such as type, specific gravity and water absorption. If this adhesion is not sufficiently enough, the stripping damage occurs in the manner that causes other failures. In this research, the stripping phenomena two years after operation is compared on the two road pavements implemented with limestone aggregates with different specific gravity and water absorption rates, while the other conditions are similar. The results show that the higher water absorption and lower specific gravity of aggregates increase the stripped aggregates and reduce the durability of asphalt mixture. Due to the huge cost of constructing roads, costs of maintenance and operation should be considered in addition to the cost of materials.
Road
مرکز تحقیقات راه، مسکن و شهرسازی
1735-062X
25
v.
93
no.
2017
23
30
https://road.bhrc.ac.ir/article_55201_b4042d7a0996d291b6a15cb33f692352.pdf
Proposing Enhanced Strategy for Transmitting and Routing In Content-Based Vehicular Ad Hoc Networks Based On Geographical Map
A.
Shadnia
M.Sc. Student, Department of Computer Eng., Kashan Beranch,Islamic Azad University, Kashan, Iran
author
M.
Romoozi
Assistant Professor, Department of Computer Eng., Kashan Beranch,Islamic Azad University, Kashan, Iran
author
text
article
2017
per
Automobile networks are now enjoyed by many researchers. The key challenge in this grid is the highly dynamic topology of this network, which is an obstacle to establishing reliable paths for content transfer. The Content-Based Content Network based on the Release / Share Reference Architecture can be a model for the highly dynamic structure of these networks. Because this model manages the addressing and tracking of paths by highly animated nodes. Information-Driven Network An innovative model suitable for a dynamic wireless environment described by dynamic topology. To solve traffic congestion in the car network, the increased demand for access to information can be exploited by these networks. The key challenge in this structure is to select the optimal path, to send and prevent the duplicate content from a ninety, which will increase the latency of your options. In this paper, the hierarchical analysis decision making structure is used to select the optimum NIS and avoid sending duplicate content to a node. The results of the network overhead reduction method were 3.2 percent, the 4.7 percent bytes of content was transferred, the total network coverage time was reduced by 2.8 percent, and the downtime delay was reduced to 1.3 percent.
Road
مرکز تحقیقات راه، مسکن و شهرسازی
1735-062X
25
v.
93
no.
2017
31
47
https://road.bhrc.ac.ir/article_55202_0358c83cbbf861be92b8c6b1835c7585.pdf
Locating the Distribution of Temporary Facilities for Emergencies, Taking Into Account the Penalty Fee
P.
Mohhamadi Vahed
M.Sc. Student, Department of Industrial Engineering Islamic Azad University, Bonab Branch, Bonab, Iran
author
M.
Yousefi nejad Attari
Assistant Professor, Department of Industrial Engineering Islamic Azad University, Bonab Branch, Bonab, Iran
author
E.
Neishabouri Jami
Professor, Department of Industrial Engineering, Islamic Azad University, Bonab Branch, Bonab, Iran
author
text
article
2017
per
Locating plays a major role in today's human life and in industrial projects, commerce, including health and relief. The role of location in the emergency and relief forces is very important. This article is intended to increase the speed of service, locate equipment, reduce shipping costs, schedule and manage the use of Limited resources and capacities. Therefore, the main goal of this research is to minimize the cost of delay, to increase the speed of service by defining a fine penalty function. Data and information such as transportation costs, city distances and other information are collected and reviewed in GAM software for exponential and linear penalty functions and the results and differences between the solutions in both cases are linear and exponential fines Together. The results showed that the mathematical model, which has a penalty function, offers more reasonable and verifiable answers than the linear method, and has more efforts to meet emergency demands than the linear method.
Road
مرکز تحقیقات راه، مسکن و شهرسازی
1735-062X
25
v.
93
no.
2017
49
65
https://road.bhrc.ac.ir/article_55203_d8f28247b1fe7c1002f9f0b90b86ff15.pdf
Estimating Perishable Goods Demand Function in Roads with Panel Data
H.
Ganji Zahrei
Member of Faculty, Financial and Economic Institute, Ministry of Road and Urban Development, Tehran, Iran
author
text
article
2017
per
Perishable goods are a kind of cargo that its transportation conditions are very important. This importance is Because of food hygiene and because of waste reduction. One of prerequisite for planning a cold chain transportation of perishable cargo is demand estimation. For this Propose, this paper is studying behavior of transportation of perishable goods in roads by estimating demand model. The model which is estimated for each of the provinces use panel data. The results show that for every one person increase in province's population perishable cargo transportation demand increases by 78.5 ton-kilometer, for every one million Rial increase in province's real GDP perishable cargo transportation demand increases by 18.49 ton-kilometer, for every one ton increase in province's milk production perishable cargo transportation demand increases by 91738.8 ton-kilometer, for every one thousand ton increase in province's meat production perishable cargo transportation demand decreases by 604516.5 ton-kilometer, for every one thousand ton increase in province's poultry production perishable cargo transportation demand decreases by 81006.3 ton-kilometer and finally for every one Rial increase in ton kilometer transportation real fare perishable cargo transportation demand decreases by 309386.3 ton-kilometer.
Road
مرکز تحقیقات راه، مسکن و شهرسازی
1735-062X
25
v.
93
no.
2017
67
74
https://road.bhrc.ac.ir/article_55204_9eb82ec12eeced7590da9d54ca16c4de.pdf