Is Superpave better than Marshall?
The literature review revealed that Superpave mix design provides better performance than Marshall method, especially for roads exposed to heavy traffic loadings and climatic changes. Therefore, adopting the Superpave design procedure in Sudan might help in enhancing the performance of the asphalt surface roads.
What is the Superpave method?
The Superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well. The compaction devices from the Hveem and Marshall procedures have been replaced by a gyratory compactor and the compaction effort in mix design is tied to expected traffic.
What is Marshall mix design?
The Marshall Mix Design method was originally developed by Bruce Marshall of the Mississippi Highway Department in 1939. The main idea of the Marshall Mix Design method involves the selection of the asphalt binder content with a suitable density which satisfies minimum stability and range of flow values.
What is mix design of asphalt?
Mix design is a process to manipulate three variables: (1) aggregate, (2) asphalt binder content and (3) the ratio of aggregate to asphalt binder with the objective of obtaining an HMA that is deformation resistant, fatigue resistant, low temperature crack resistant, durable, moisture damage resistant, skid resistant …
What is Superpave asphaltic concrete?
SUPERPAVE ASPHALT CONCRETE END PRODUCT SPECIFICATION (EPS) 1.0 DESCRIPTION. This item consists of supplying crushed aggregates, blending materials, anti-stripping agent, asphalt binder, production, loading, hauling, placing and compaction of hot mix asphalt concrete, including asphalt concrete patching.
When was Superpave created?
1992
After five years of intensive research and testing, SHRP introduced the Superpave system in 1992.
What is Superpave 19?
Superpave 19.0 Binder course mix for Traffic Category A, B, C, D, and E roads. Superpave 19.0 is similar to the traditional HL 4, HL 8, and (HS) HL 8 mixes according to OPSS 1150. Superpave 25.0 Large stone binder course mixes for use when thicker binder course lifts are required.
Which are the two major features in the Marshall mix design?
All mix design methods use density and voids to determine basic HMA physical characteristics. Two different measures of densities are typically taken: Bulk specific gravity (Gmb). Theoretical maximum specific gravity (TMD, Gmm).
How is Marshall mix design calculated?
The Marshall mix design method consists of 6 basic steps: Aggregate selection. Asphalt binder selection. Sample preparation (including compaction)…Density and Voids Analysis.
| Nominal Maximum Particle Size | Minimum VMA (percent) | |
|---|---|---|
| 12.5 | 0.5 inch | 15 |
| 9.5 | 0.375 inch | 16 |
| 4.75 | No. 4 sieve | 18 |
| 2.36 | No. 8 sieve | 21 |
What is Superpave binder?
A New Approach to Asphalt Mix Design Rather than a specific process or procedure, Superpave is a performance-based specification for asphalt binder and volumetric mixture design. Mix design system and analysis tests for performance prediction models.
Is Superpave an HMA?
Superpave consists of (1) an asphalt binder specification, (2) an HMA mix design method and (3) HMA tests and performance prediction models. Each one of these components is referred to by the term “Superpave”.
What is the difference between Superpave and Marshall mix?
Superpave stands for Superior Performing Asphalt Pavements. Differences between the Superpave and the Marshall mix design methods are mainly in the selection procedure of the materials, the compaction method, specimen dimensions, void analysis approach and specifications. Click to see full answer.
How is Superpave used in mix design process?
The Superpave system ties asphalt binder and aggregate selection into the mix design process, and consider traffic and climate as well. The compaction devices from the Hveem and Marshall procedures have been replaced by a gyratory compactor and the compaction effort in mix design is tied to expected traffic.
What do you need to know about Marshall mix design?
The Marshall method seeks to select the asphalt content at a desired density that satisfies minimum stability and range of flow values. Typically, the Marshall Mix Design method consists of three basic steps. Aggregate Selection: Different agencies/owners specify different methods of aggregate acceptance.
Which is the best asphalt mix design method?
One of the principal results from the Strategic Highway Research Program (SHRP) was the Superpave (Superior Performing Asphalt Pavements) mix design method. The Superpave mix design method was designed to replace the Hveem and Marshall methods.