Comparative research on Superpave Gyratory Compaction method and Marshall Compaction method in the mix design of AC-16

2011 ◽  
Author(s):  
Yongchun Cheng ◽  
Haipeng Bi ◽  
Yafeng Gong ◽  
Yubo Jiao ◽  
Xiaochao Yang
Keyword(s):  
Comparative Research ◽  
Mix Design ◽  
Gyratory Compaction ◽  
Compaction Method

scholarly journals Laboratory Mix Design of Asphalt Mixture Containing Reclaimed Material

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Davide Lo Presti ◽  
Rawid Khan ◽  
Norhidayah Abdul Hassan ◽  
Gordon Airey ◽  
Andrew Collop
Keyword(s):  
Asphalt Mixture ◽  
Mix Design ◽  
Reclaimed Asphalt ◽  
X Ray ◽  
Concrete Mixtures ◽  
Homogeneous Test ◽  
Stone Mastic Asphalt ◽  
Gyratory Compaction ◽  
X Ray Computed ◽  
Compaction Method

This paper presents a study on the production of asphalt test specimens in the laboratory containing reclaimed asphalt. The mixtures considered were stone mastic asphalt concrete mixtures containing up to 30% of reclaimed asphalt. Specimens were compacted to the reference density obtained from the Marshall mix design. Gyration compaction method was used for preparing specimens for the experimental programme, while coring and cutting methods and X-ray computed tomography (CT) were used to investigate the change in properties within the specimens and to validate the selected methodology. The study concluded that gyratory compaction is suitable to produce homogeneous test specimens also for mixtures containing high amount of reclaimed asphalt. Nevertheless, preliminary trials for each material are mandatory, as well as final coring and trimming of the specimens due to side effects.

Use of Superpave Technology for Design and Construction of Rubberized Asphalt Mixtures

1997 ◽  
Vol 1583 (1) ◽  
pp. 71-81 ◽  
Author(s):  
H. Barry Takallou ◽  
Hussain U. Bahia ◽  
Dario Perdomo ◽  
Robert Schwartz
Keyword(s):  
Fatigue Behavior ◽  
Permanent Deformation ◽  
Performance Testing ◽  
Fatigue Cracking ◽  
Asphalt Mixtures ◽  
Mix Design ◽  
Asphalt Rubber ◽  
Constant Height ◽  
Overlay Design ◽  
Gyratory Compaction

The effect of different mixing times and mixing temperatures on the performance of asphalt-rubber binder was evaluated. Four different types of asphalt-rubber binders and neat asphalt were characterized using the Strategic Highway Research Program (SHRP) binder method tests. Subsequently, mix designs were carried out using both the SHRP Levels I and II mix design procedures, as well as the traditional Marshall mix design scheme. Additionally, performance testing was carried out on the mixtures using the Superpave repetitive simple shear test at constant height (RSST-CH) to evaluate the resistance to permanent deformation (rutting) of the rubberized asphalt mixtures. Also, six rectangular beams were subjected to repeated bending in the fatigue tester at different microstrain levels to establish rubberized asphalt mixtures’ resistance to fatigue cracking under repeated loadings. The results indicate that the Superpave mix design produced asphalt-rubber contents that are significantly higher than values used successfully in the field. Marshall-used gyratory compaction could not produce the same densification trends. Superpave mixture analysis testing (Level II) was used successfully for rubberized asphalt mixtures. Results clearly indicated that the mixture selected exhibited acceptable rutting and fatigue behavior for typical new construction and for overlay design. Few problems were encountered in running the Superpave models. The results of the RSST-CH indicate that rubber-modified asphalt concrete meets the criteria for a maximum rut depth of 0.5 in.; and more consistent results were measured for fatigue performance analysis using the repeated four-point bending beam testing (Superpave optional torture testing). The cycles to failure were approximately 26,000 at 600 microstrain.

Strategic Highway Research Program gyratory compaction for predicting air voids of Saskatchewan SPS-9A asphalt mixes after 10 years of performance in the field

2012 ◽  
Vol 39 (8) ◽  
pp. 897-905 ◽  
Author(s):  
Aziz Salifu ◽  
Curtis Berthelot ◽  
Ania Anthony ◽  
Brent Marjerison
Keyword(s):  
Asphalt Concrete ◽  
Material Properties ◽  
Hot Mix Asphalt ◽  
Permanent Deformation ◽  
Test Site ◽  
Asphalt Mixes ◽  
Air Voids ◽  
Need To Evaluate ◽  
Gyratory Compaction ◽  
Compaction Method

Many Saskatchewan provincial highways exhibit permanent deformation that is mostly attributed to reduction in air voids in hot mix asphalt concrete surfacing. The Saskatchewan Ministry of Highways and Infrastructure (MHI) currently use the Marshall compaction method for hot mix asphalt concrete (HMAC) design and placement quality control and quality assurance. It has been found that the Marshall compaction method does not accurately predict field air voids. Therefore, MHI identified the need to evaluate the SuperpaveTM gyratory compaction method to predict field air voids of typical Saskatchewan asphalt mixes. This paper presents a summary of laboratory and field volumetric as well as rapid triaxial mechanistic material properties of typical Saskatchewan asphalt mixes. This research considered seven asphalt mixes from the Radisson Specific Pavement Study (SPS)-9A test site comprising two conventional Saskatchewan Marshall Type 71 mixes, five SuperpaveTM mixes, and a SuperpaveTM recycled mix. This research determined that Marshall compaction and the gyratory compaction at 1.25° gyration angle underestimate the collapse of field air voids. This research also showed that the gyratory compaction method at 2.00° angle of gyration more accurately predicted field air voids of the asphalt mixes constructed as part of test site.

Effect of Aggregate Degradation on Specimens Compacted by Superpave Gyratory Compactor

1997 ◽  
Vol 1590 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Ronald Collins ◽  
Donald Watson ◽  
Andrew Johnson ◽  
Yiping (Peter) Wu
Keyword(s):  
Los Angeles ◽  
Volumetric Properties ◽  
Los Angeles Abrasion ◽  
Superpave Gyratory Compactor ◽  
Asphalt Mix ◽  
Field Compaction ◽  
Gyratory Compaction ◽  
Vibratory Compaction ◽  
Level I ◽  
Compaction Method

Aggregate degradation during gyratory compaction may cause changes in the original gradation of the aggregate, and it may also affect volumetric requirements for Superpave Level I mix design. The effect of aggregate degradation on the design gradation and final volumetric properties of the asphalt mix compacted by the Superpave gyratory and Astec vibratory compactors was evaluated. Because vibratory compaction is an alternative compaction method that simulates field compaction, a vibratory compactor developed by Astec Industries, Inc., was used for comparison with the Superpave gyratory compactor. Aggregates with high and low Los Angeles abrasion losses were used to evaluate the effect of aggregate toughness or abrasion resistance on gradation change and volumetric properties. The changes in the amount of material passing the 0.075-mm sieve due to aggregate degradation during compaction were not significant enough to prevent specimens from meeting dust proportion requirements, regardless of whether low-or high-abrasion loss aggregates were used. A mix containing high-abrasion aggregate was less likely to meet restricted zone requirements than a mix using low-abrasion aggregate after degradation resulting from compaction.

scholarly journals Influence of the Compaction Method in the Volumetric Design of Cold Recycled Mixtures with Emulsion

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1309
Author(s):  
Guillermo Flores ◽  
Juan Gallego ◽  
Lucía Miranda ◽  
José Ramón Marcobal
Keyword(s):  
Mechanical Properties ◽  
Water Content ◽  
Bulk Density ◽  
Asphalt Mixtures ◽  
Combined Effect ◽  
Recycled Asphalt ◽  
New Approach ◽  
Two Factors ◽  
Gyratory Compaction ◽  
Compaction Method

Compaction of cold asphalt mixtures is a subject that has not been thoroughly studied, and, for this reason, requires new efforts from researchers to have a better understanding. Unlike hot mixtures, cold mixtures and mainly recycled mixtures require specific considerations for compaction. There is a lack of consensus about the methodology to select the optimum premix water and emulsion contents. In the absence of specific regulations, the use of soil tests or hot mixtures procedures is common. For these reasons, this investigation’s main goal was to evaluate two compaction methods used to design cold recycled mixtures with emulsion: the modified Proctor procedure and the gyratory compaction. It was concluded that both methods could be useful to study compactability since consistent results were obtained by applying the maximum bulk density criterion. However, the higher bulk densities achieved, the smaller specimens used, and the suitability of the gyratory specimens to be later tested for mechanical properties make them preferable to the modified Proctor samples. A new approach has been proposed using iso-density lines on dual-axis premix water content-emulsion content graphs that facilitates the study of the influence on compactability of these two factors combined. These contributions can alleviate the laboratory works during the design of cold recycled asphalt mixtures and contribute to a more in-depth knowledge of the combined effect of premix water and emulsion contents on the compactability of cold recycled mixtures with emulsion.

From meditation to action – a research agenda for studying informal global rule-making: remarks on ‘Cosmopolitanism, publicity, and the emergence of a “global administrative law”’

2020 ◽  
pp. 1-7
Author(s):  
Oliver Westerwinter
Keyword(s):  
Global Governance ◽  
Comparative Research ◽  
Research Agenda ◽  
Institutional Design ◽  
Administrative Law ◽  
Democratic Legitimacy ◽  
Institutional Architecture ◽  
Global Law ◽  
Rule Making ◽  
Law Making

Abstract Friedrich Kratochwil engages critically with the emergence of a global administrative law and its consequences for the democratic legitimacy of global governance. While he makes important contributions to our understanding of global governance, he does not sufficiently discuss the differences in the institutional design of new forms of global law-making and their consequences for the effectiveness and legitimacy of global governance. I elaborate on these limitations and outline a comparative research agenda on the emergence, design, and effectiveness of the diverse arrangements that constitute the complex institutional architecture of contemporary global governance.

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