Mechanistic approach to predict service life of flexible pavements subjected to heavy traffic loads

Bitumen is widely used in road construction. Due to heavy traffic loads and environmental factors, bitumen properties will change during service life. Bitumen will age due to diffusion of oxygen and UV radiation. Repeated loading will result in decreasing strength because of fatigue. In this paper, one layer clay powder was used to modify base bitumen with different mass contents. Then the influences of ultraviolet radiation (UV) aging on the dynamic fatigue properties of the layered clay powder were evaluated by Dynamic Shear Rheomoter (DSR) and Universal Testing Machine (UTM). The ageing evaluation shows that the ageing resistance of bitumen is improved and this improvement is more notable in bitumen fatigue than mixture.

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Efficient Intrusion Detection for High-Speed Networks

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.263-266.2915 ◽

2012 ◽

Vol 263-266 ◽

pp. 2915-2919

Author(s):

Gao Long Ma ◽

Wen Tang

Keyword(s):

Intrusion Detection ◽

Error Detection ◽

Intrusion Detection System ◽

High Speed ◽

Detection System ◽

Heavy Traffic ◽

High Speed Networks ◽

Network Intrusion ◽

Traffic Loads ◽

Rule Sets

With the great increasing of high-speed networks,the traditional network intrusion detection system(NIDS) has a serious problem with handling heavy traffic loads in real-time ,which may result in packets loss and error detection . In this paper we will introduce the efficient load balancing scheme into NIDS and improve rule sets of the detection engine so as to make NIDS more suitable to high-speed networks environment.

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HEAVY TRAFFIC APPROXIMATIONS FOR A SYSTEM OF INFINITE SERVERS WITH LOAD BALANCING

Probability in the Engineering and Informational Sciences ◽

10.1017/s0269964899133011 ◽

1999 ◽

Vol 13 (3) ◽

pp. 251-273 ◽

Cited By ~ 10

Author(s):

Philip J. Fleming ◽

Burton Simon

Keyword(s):

State Space ◽

Heavy Traffic ◽

Joint Probability ◽

Mass Function ◽

Accurate Estimate ◽

The State ◽

Probability Mass Function ◽

Traffic Loads ◽

Wide Range ◽

Heavy Traffic Approximations

We consider an exponential queueing system with multiple stations, each of which has an infinite number of servers and a dedicated arrival stream of jobs. In addition, there is an arrival stream of jobs that choose a station based on the state of the system. In this paper we describe two heavy traffic approximations for the stationary joint probability mass function of the number of busy servers at each station. One of the approximations involves state-space collapse and is accurate for large traffic loads. The state-space in the second approximation does not collapse. It provides an accurate estimate of the stationary behavior of the system over a wide range of traffic loads.

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BAHAN TAMBAH SERAT ECENG GONDOK PADA LASTON TIPE XI TERHADAP INDEKS MARSHALL TEST MENGGUNAKAN KERIKIL MANTUP

UKaRsT ◽

10.30737/ukarst.v2i2.269 ◽

2018 ◽

Vol 2 (2) ◽

pp. 8

Author(s):

Sugeng Dwi Hartantyo ◽

Rasiyo Hepiyanto

Keyword(s):

Asphalt Concrete ◽

Water Hyacinth ◽

Heavy Traffic ◽

Asphalt Mixture ◽

Cellulose Fiber ◽

Fine Aggregate ◽

Traffic Loads ◽

Marshall Test ◽

Technical Specifications

Laston is a mixture of coarse aggregate, fine aggregate, and filler with a binder under the temperature of 145-155oC with the composition being studied and regulated by technical specifications. Laston is also known as AC (Asphalt Concrete).Laston itself is commonly used in Indonesia with continuous gradations used for heavy traffic loads. To get the addictive material is not easy and the material is expensive. Therefore, it is necessary to find alternatives to the cellulose fiber. Water hyacinth is a water weed that once grow and develop, it has high cellulose fiber content, which is about 60%.For that, done a research to add a hot asphalt mixture material that aims to improve the quality of mixed result. The selected material is natural water hyacinth. The method used is trial and error with reference of SNI 03-1737-1989. Variations used are 3%, 5%, and 7% of the asphalt weight, asphalt level used Is 5.61%.The result of this study is Marshall evaluation where the greatest score obtained for stability is 1325 kg, Flow is 3.73 mm, Quotient Marshall is 401.02 kg/mm, VMA is 66.30%, VFWA is 19.25%, and VIM score is 54.35 %. With this result, the asphalt mixture can not be used because the results of VMA, VFWA, and VIM have not been suitable on specification of SNI 03-1737-1989. Keywords: Laston, Asphalt Concrete, Water Hyacinth, SNI 03-1737-1989.

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Mechanical Connectors to Enhance the Interfacial Debonding of Concrete Overlays

Applied Sciences ◽

10.3390/app10113876 ◽

2020 ◽

Vol 10 (11) ◽

pp. 3876

Author(s):

Rubén-Daniel López-Carreño ◽

Sergio Carrascón ◽

Antonio Aguado ◽

Pablo Pujadas

Keyword(s):

Heavy Traffic ◽

Interfacial Debonding ◽

Structural Performance ◽

Concrete Overlays ◽

Traffic Loads ◽

Strength Capacity ◽

Innovative Solution ◽

Real Scale

Concrete bonded whitetoppings and overlays usually fail due to a loss of bond between the layers as a consequence of direct actions (traffic loads) or indirect actions (temperature differences or shrinkage in the layers). These actions generate stresses in the interface that may exceed the strength capacity of the union between layers. This paper proposed an innovative solution for this problem that consisted of placing mechanical connectors in the overlay interfaces to provide them with post-cracking strength and maintaining the monolithic response of the pavement. Three experimental programs on real-scale pavements with two types of mechanical connectors were studied under heavy traffic in terms of structural performance. Findings reveal that this technique might be an excellent solution to the problem of interfacial debonding.

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