Asphalt, Paving & Construction
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Durawhisper®

Lafarge Asphalt is committed to being the leading developer and supplier in North America of innovative asphalt products designed to optimize quality, performance, durability, and sustainability.

 

Durawhisper® hot mix asphalt uses crumb rubber to modify the asphalt cement binder to provide a thin asphalt overlay specifically designed to reduce noise.

 

Product Overview

 

Durawhisper consists of a 10mm nominal size, dense-graded asphalt mixture designed with 2 to 4 percent air voids. The aggregate particle shape and the design of the stone skeleton provide excellent rutting resistance and vehicular traffic noise-reducing characteristics. Crumb rubber, which is added to the asphalt mix, is beneficial for improved durability and long-term performance, particularly when subject to heavy slow-moving traffic.

 

The combination of the crumb rubber additive and the use of a polymer-modified binder provide increased resistance to reflective cracking initiated when paving overlays to existing concrete slabs.

 

Its traffic noise-reducing properties make Durawhisper ideal for surfacing in and around subdivisions and general residential areas.

 

Technical Benefits of Durawhisper

 

  • Reduces tire noise
  • Provides improved resistance to surface-initiated cracking and improved resistance to fatigue and reflection cracking
  • Improves rutting resistance
  • Results in reduced life-cycle costing and lower pavement maintenance costs

 

Product Performance

 

Tire-rubber crumb asphalt can be added in two ways (both requiring additional, specialized equipment):

 

1. Wet process: The asphalt rubber binder contains 15 to 20 percent tire-rubber crumbs from processed tires. The asphalt binder and tire-rubber crumbs are mixed together at elevated temperatures to achieve a homogenous binder.

 

 

2. Dry process: 1 to 2 percent tire-rubber crumbs are mixed in as a dry aggregate.

 

Durawhisper has been subjected to a rigorous performance testing regime, providing the following performance results:

 

  • Maximum laboratory wheel-rut depth of 5 millimeters after 8,000 cycles at standard PGAC high temperatures, AASHTO TP 63;
  • Minimum fatigue resistance to failure of 230,000 cycles at 480 μm and 18 degrees C (AASHTO T 321)
  • Reduced tire noise by 8 dB (1.0 millimeter offset X 1.0 millimeter height roadside measurement).

Residential subdivision paved with Durawhisper

Durawhisper paving for overlaying concrete pavements

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Durapave®

Lafarge Asphalt is committed to being North America's leading developer and supplier of innovative Asphalt products designed to optimize quality, performance, durability, and sustainability. Each of the products in our Durapave® series offers unique performance characteristics designed to address a range of needs such as moisture damage, high axle loading and sound attenuation. At the heart of all of our Asphalt products is research, testing  and development, ensuring the highest end performance is delivered.

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