scholarly journals Development of the Asphalt Multi-Integrated Roller Field and Experimental Studies

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Abd El Halim Omar Abd El Halim ◽  
Amir Omar Abd El Halim ◽  
Moustafa Awadalla ◽  
Mohamed Adel Hassanin
Keyword(s):  
Research Work ◽  
Experimental Studies ◽  
Geographic Location ◽  
Field Trials ◽  
Asphalt Pavements ◽  
Flat Plates ◽  
New Developments ◽  
Long Term Performance ◽  
Term Performance

Asphalt pavements have been compacted using steel drum rollers for a century. However, the problems that are observed today on these pavements are universal with no solution in sight. Intensive research work has been invested to identify the mechanisms that cause these problems. A recent development was the introduction of SuperPave mix design, GP asphalt cements, and the use of reinforcing elements ranging from polymer to steel bars. Yet it seems that none of these solutions have succeeded in eliminating any of the old problems. The pavements suffer from serious distresses regardless of the geographic location of the pavements and its design, materials, traffic loads, and climate condition. This paper presents a new approach to deal with the problems facing the asphalt pavements. While the research efforts to date concentrated on materials-related solutions, this paper identifies conventional compaction equipment as the cause of many problems observed on the pavements. The paper provides the development of the new Asphalt Multi-Integrated Roller, AMIR, and discusses new developments leading to a number of commercial field trials on several Ontario highways. The paper concludes that current compactors must be replaced with soft flat plates in order to achieve the required specifications for long term performance.

Bank-SME Relationships

2013 ◽  
pp. 191-213
Author(s):  
Myria Ioannou ◽  
Simona Mihai-Yiannaki
Keyword(s):  
Negative Impact ◽  
Relationship Management ◽  
Ethnographic Research ◽  
Communication Mode ◽  
Technological Environment ◽  
New Developments ◽  
Research Platform ◽  
Long Term Performance ◽  
Term Performance

The chapter synthesizes extant interdisciplinary literature, by putting together a combination of relationship management theories as well as banking, economics, and finance theories, and blends this with findings from an ethnographic research platform to discuss the critical variables in the development of Bank-SME relationships. In addition, the chapter considers the effect of the recent economic crisis on the Bank-SME relationship. It can be seen that few banks looked inside their relationship with their SME customers as a means of redressing the crisis’ effect and this has detrimental effects on their long-term performance. As a consequence, the chapter proposes recommendations so as to reduce the crisis negative impact. Moreover, it highlights that the new developments in the technological environment, i.e. social media, can be used to strengthen the Bank-SME relationship’s success and is especially pertinent in such times of financial duress as it can enhance the communication mode of the dyad.

Evaluation of the long-term performance and life cycle costs of GTR asphalt pavements

2016 ◽  
Vol 114 ◽  
pp. 261-268 ◽  
Author(s):  
Munir D. Nazzal ◽  
Md. Tanvir Iqbal ◽  
Sang Soo Kim ◽  
Ala R. Abbas ◽  
Moses Akentuna ◽  
...  
Keyword(s):  
Life Cycle ◽  
Asphalt Pavements ◽  
Life Cycle Costs ◽  
Long Term Performance ◽  
Term Performance

Long-term Performance of Fiber Grid Reinforced Asphalt Pavements Overlaid on Old Concrete Pavements

2017 ◽  
Vol 19 (3) ◽  
pp. 31-43
Author(s):  
Ju Myeong Lee ◽  
Seung Beom Baek ◽  
Kang Hoon Lee ◽  
Jo Soon Kim ◽  
Jin Hoon Jeong
Keyword(s):  
Asphalt Pavements ◽  
Concrete Pavements ◽  
Long Term Performance ◽  
Term Performance

Remaining Uncertainties in Predicting Long-Term Performance of Nuclear Waste Glass From Experiments

1993 ◽  
Vol 333 ◽  
Author(s):  
B. Grambow ◽  
Kernforschungszentrum Karlsruhe
Keyword(s):  
Current Knowledge ◽  
Research Work ◽  
Waste Glass ◽  
Dissolution Mechanism ◽  
Glass Dissolution ◽  
Radionuclide Release ◽  
Long Term Performance ◽  
Term Performance ◽  
Term Maintenance

ABSTRACTThe current knowledge on the glass dissolution mechanism and the representation of glass dissolution concepts within overall repository performance assessment models are briefly summarized and uncertainties related to mechanism, radionuclide chemistry and parameters are discussed. Understanding of the major glass dissolution processes has been significantly increased in recent years. Long-term glass stability is related to the long-term maintenance of silica saturated conditions. The behavior of individual radionuclides in the presence of a dissolving glass has not been sufficiently and results do not yet allow meaningful predictions. Conservative long-term predictions of glass matrix dissolution as upper limit for radionuclide release can be made with sufficient confidence, however these estimations generally result in a situation were the barrier function of the glass is masked by the efficiency of the geologic barrier. Realistic long-term predictions may show that the borosilicate waste glass contributes to overall repository safety to a much larger extent than indicated by overconservatism. Today realistic predictions remain highly uncertain and much more research work is necessary. In particular the long-term rate under silica saturated conditions needs to be understood and the behavior of individual radionuclides in the presence of a dissolving glass deserves more systematic investigations.

Adsorption of actinides within speleothems

2016 ◽  
Vol 80 (5) ◽  
pp. 765-780 ◽  
Author(s):  
P. Sengupta ◽  
J. Sanwal ◽  
N. L. Dudwadkar ◽  
S. C. Tripathi ◽  
P. M. Gandhi
Keyword(s):  
Valence State ◽  
Experimental Studies ◽  
Distribution Coefficients ◽  
Nuclear Wastes ◽  
Lesser Himalayas ◽  
Safety Assessments ◽  
High Level ◽  
Long Term Performance ◽  
Term Performance

AbstractStalagmites and stalactites, as observed within natural caves, may develop inside geological repositories during constructional and post-operational periods. It is therefore important to understand actinide sorption within such materials. Towards this, experimental studies were carried out with 233U, 238Np (VI), 238Np (IV), 239Pu and 241Am radiotracers using natural speleothem samples collected from the Dharamjali cave of the Kumaon Lesser Himalayas, India. Petrological/mineralogical studies showed that natural speleothems have three general domains: (1) columnar calcite; (2) microcrystalline calcite; and (3) botryoidal aragonite – each with ferruginous materials. Results showed that all domains of speleothems can take up >99% actinides, irrespective of valence state and pH (1–6 range) of the solution. However, distribution coefficients were found to be at a maximum in aragonite for most of the actinides. Such data are very important for long-term performance and safety assessments of the deep geological repositories planned for the disposal of high-level nuclear wastes.

A Long-Term Performance Evaluation of an Experimental Concrete Overlay

2018 ◽  
Vol 2672 (40) ◽  
pp. 275-281
Author(s):  
James Greene ◽  
Ohhoon Kwon ◽  
Abdenour Nazef ◽  
Bouzid Choubane
Keyword(s):  
Asphalt Pavements ◽  
Experimental Program ◽  
Department Of Transportation ◽  
Joint Spacing ◽  
Concrete Overlays ◽  
Pavement Roughness ◽  
Florida Department ◽  
Long Term Performance ◽  
Term Performance

Flexible pavements are often rehabilitated by milling distressed asphalt and placing new asphalt at a thickness that accounts for expected traffic growth and pavement life. However, there are many reported benefits to concrete overlays as a method to rehabilitate and preserve distressed asphalt pavements. In 1988, the Florida Department of Transportation designed and constructed an unbonded concrete overlay on US-1 between Daytona Beach and Titusville. The 1.9-mile concrete overlay was part of a larger 8-mile milling and resurfacing of a deteriorated asphalt pavement. The concrete overlay test sections were divided into three groups based on design thicknesses of 6, 7, and 8 inches. Each of these groups included subsections with three joint spacing levels and two dowel bar configurations consisting of standard 12-inch spacing and wheel path only. The overlay sections are still in service with no major rehabilitation effort. The primary distress is pavement roughness found in sections with wheel path dowels only. The section with the most cracked slabs had joint spacings of 20 ft, which is no longer recommended. This paper documents the experimental program and presents the analysis and findings.

LONG-TERM PERFORMANCE OF ASPHALT PAVEMENTS AT BIBI NEW TEST ROAD

2006 ◽  
Vol 62 (3) ◽  
pp. 519-530
Author(s):  
Kimio MARUYAMA ◽  
Jun TAKO ◽  
Atsushi KASAHARA
Keyword(s):  
Asphalt Pavements ◽  
Test Road ◽  
Long Term Performance ◽  
Term Performance

Cold Recycling of Waste Asphalt Pavement in Cold Region

2011 ◽  
Vol 183-185 ◽  
pp. 319-322
Author(s):  
Yong Li Xu ◽  
Pei Feng Cheng ◽  
Guo Feng Liu ◽  
Ming Chen Lei
Keyword(s):  
Low Temperature ◽  
Bending Test ◽  
Asphalt Pavements ◽  
Recycled Asphalt ◽  
Split Test ◽  
Cold Recycling ◽  
Long Term Performance ◽  
Emulsified Asphalt ◽  
Term Performance

The characteristics of the mixture of recycled asphalt pavements with emulsified asphalt and cement, as the pavement material, was investigated in this research. Kantabro Loss test was used to evaluate initial performance of the recycling mixture and to propose appropriate parameter. Rutting test, split test and low-temperature bending test were carried out to evaluate the long-term performance. The performance of the mixture at low temperature was one of the most important factors to be considered to ensure its application in cold areas. The results showed that the performance of the mixture was effect by old mixes milled. The proposed application conditions of the recycled mixture were also discussed in this paper.

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