What is the hveem method?
What is the hveem method?
The Hveem method, like other mix design methods, creates several trial aggregate-asphalt binder blends, each with a different asphalt binder content. Then, by evaluating each trial blend’s performance, an optimum asphalt binder content can be selected.
What is a hveem test?
The Hveem Stabilometer is a triaxial testing device used to determine the stability of bituminous paving mixtures, soils and other plastic or semi-plastic materials. Test results are used to determine the maximum amount of bituminous binder which can be used without causing instability.
What is VMA in pavement?
Voids in the mineral aggregate (VMA) are the air-void spaces that exist between the aggregate particles in a compacted paving mixture, including spaces filled with asphalt. VMA represents the space that is available to accommodate the asphalt and the volume of air voids necessary in the mixture.
What is the difference between Marshall mix and Superpave?
Marshall mix design primarily address the determination of asphalt binder content, while Superpave addresses all element of mix design. The Marshall design/construction method requires in most cases compaction 95% or greater of the maximum lab value.
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 super pavement?
Superpave stands for Superior Performing Asphalt Pavements. The Superpave system includes a performance-based asphalt binder specification, a mix design analysis system, many new test procedures, and new equipment. It encompasses new material specifications, test methods, equipment, software, and mixture design method.
How do you calculate VMA?
VMA = 100 – (2.344 x 93.04) 2.652 = 100 – 82.23 = 17.77 Calculation using data from Table 1 and section 3.2. Where: P’b = asphalt, percent by dry weight of aggregate. Where: Pa = air voids in compacted mixture, percent of total volume.
What is the density of HMA?
approximately 145 pounds per cubic foot
The density of the compacted mix is its unit weight, or the weight of a specific volume of mix. For compacted HMA, this is approximately 145 pounds per cubic foot.
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 dust to binder ratio?
During design, mixtures that are above the maximum density line at the 2.36-mm (for 19-mm or smaller mixtures) or 4.75-mm (for 25-mm or larger mixtures) critical sieve should have a dust-to-binder ratio of no more than 1.4.
What is flow value of bitumen?
The flow values for the asphalt concrete with mineral filler range from 2.3 mm – 3.3 mm, while that with hydrated lime range from 2.4 – 3.4 mm. The optimum bitumen content for both mixtures was found to be 6.5%.
What is optimum binder content?
The optimum binder content (OBC) refers to the amount of asphalt binder that balances different desirable mixture properties for each combination of aggregate type, aggregate gradation, additive type, additive dosage and binder type.
What is the Hveem stabilometer?
The Hveem Stabilometer is a triaxial testing device used to determine the stability of bituminous paving mixtures, soils and other plastic or semi-plastic materials.
What is Hveem’s method of oil determination?
Based on his research, and that of others, Francis N. Hveem developed a method for determining the correct amount of oil based on aggregate surface area, which could be determined from gradation.
What is the Hveem method of mix design?
The Hveem method, like other mix design methods, creates several trial aggregate-asphalt binder blends, each with a different asphalt binder content. Then, by evaluating each trial blend’s performance, an optimum asphalt binder content can be selected.
What is the Hveem method of asphalt grinding?
The basic philosophy surrounding the Hveem method can be summarized in the following three points (Vallerga and Lovering, 1985 [1] ): HMA requires enough asphalt binder to coat each aggregate particle to an optimum film thickness (allowing for its absorption into the aggregate).
