Contact Us

If you have any questions, you can contact us. Required fields are marked *

vma in hot mix asphalt

The Effect of Voids in Mineral Aggregate (VMA) on Hot Mix ...

(VMA) during mix design and in the field will help establish adequate film thickness without excessive asphalt bleeding or flushing. Krugler, et al [1] described durability as one of the most important factors in the performance of hot-mix asphalt (HMA). Durability refers to the ability of an HMA pavement to resist changes

Learn More

VMA as a design parameter in hot-mix asphalt

the basis for selecting the asphalt binder content. VMA is defined as the sum of the volumes of the air voids and the unabsorbed binder in the compacted specimen. VFA is the percentage of VMA containing asphalt binder. It is widely accepted that these volumetric properties are useful in predicting hot-mix asphalt pavement performance. Ex-

Learn More

Volumetrics in Asphalt Mixtures

asphalt and a dry looking, low durability mix. Therefore, economizing in asphalt content by lowering VMA is actually counter-productive and detrimental to pavement quality. VMA (Voids in Mineral Aggregate ) = (Vol. of air + effective asphalt) (Bulk vol. of compacted mix) = (Va + Vb - Vba) / Vmb X 100% = (Va + Vbe ) / Vmb X 100%

Learn More

Minimum VMA in HMA Based on Gradation and Volumetric ...

The use of voids in the mineral aggregate (VMA) criteria for proper mix design of hot mix asphalt (HMA) mixtures is a time honored and fairly successful tool. Recent developments in the field of asphalt mix design have encouraged the use of mixtures with a coarse aggregate structure to resist the affect of heavy traffic loads.

Learn More

HMA Weight-Volume Terms and Relationships - Pavement ...

What is a low VMA mixture?

Learn More

VMA-One Key to Mixture Performance

Using VMA to evaluate and design asphalt concrete mixtures first gained popularity in the 1950’s, largely due to the efforts of Norman McLeod, a Canadian engineer and researcher who has made many other contributions to hot-mix asphalt technology.

Learn More

Volumetric Design for Hot-Mix Asphalt (HMA)

1.1 This standard for mix design evaluation uses aggregate and mixture properties to produce a hot-mix asphalt (HMA) job-mix formula. The mix design is based on the volumetric properties of the HMA in terms of the air voids (V ), voids in the mineral aggregate (VMA), and voids . a . filled with asphalt (VFA).

Learn More

PPT – Hot Mix Asphalt (HMA) Volumetric Properties PowerPoint ...

Title: Hot Mix Asphalt (HMA) Volumetric Properties 1 ... 4.6 VMA 18.2 Absorbed Asphalt Content 0.4 VFA 58.2 Max Theo Sp Grav 2.521 39 Questions - ?

Learn More

VOLUMETRIC ANALYSIS OF HMA MIXTURES

– Calculate the percent effective asphalt for the mixture – Calculate the percent voids in total mix for the mixture – Calculate the percent voids in mineral aggregate for the mixture – Calculate the percent voids filled with asphalt for the mixture – Calculate the dust to asphalt ratio

Learn More

Fix your mix | Asphalt magazine

And when you lower the asphalt content, the mix becomes more economical but also less durable. To understand proper VMA, we can go back to the 1990s during the development of Superpave. A critical component of Superpave mix design is the minimum VMA criteria for each different size mix. A 9.5 mm mix has a minimum VMA of 15.0 percent, a 12.5 mm ...

Learn More

Minimum VMA in HMA Based on Gradation and Volumetric Properties

The use of voids in the mineral aggregate (VMA) criteria for proper mix design of hot mix asphalt (HMA) mixtures is a time honored and fairly successful tool. Recent developments in the field of asphalt m~x design have encouraged the use of mixtures with a coarse aggregate structure to resist the affect of heavy traffic loads.

Learn More

Standard Test Method for Determining Field VMA based on the ...

1.1 This test method is intended to be used for a rapid field determination of voids in mineral aggregate (VMA) of hot mix asphalt (HMA). It provides equations for calculating the VMA based on the asphalt content of the mix and its maximum specific gravity (G mm).

Learn More

Evaluation of VMA and Film Thickness Requirements in Hot-Mix ...

Keywords: VMA, Film thickness, Hot mix asphalt, Asphalt concrete, Aggregate 1. Introduction The importance of volumetric analysis of hot asphaltic concrete mixtures has been studied by several researchers since 1950’s, and voids in mineral aggregates was one of the most important parameters in volumetric analysis,

Learn More

Effect of low VMA in hot mix asphalt on load-related cracking ...

Voids in mineral aggregate (VMA) is an important parameter in hot mix asphalt (HMA) mix design. It is believed that a minimum VMA requirement is necessary to ensure adequate binder content and durability for HMA. This paper investigates the effect of lower than typically acceptable VMA on the load-related cracking resistance of four dense ...

Learn More

611 - HOT MIX ASPHALT (HMA)-COMMERCIAL GRADE SECTION 611 HOT ...

mix may have a lower VMA and require a reduction in binder content.). On projects with less than 500 tons of commercial grade asphalt mixture, testing (QC/QA or cold-feed gradations) is at the Engineer’s discretion.

Learn More