DURAWHISPER

Reducing Road Noise with Recycled Rubber

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

Durawhisper™ consists of a 10 mm 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.

Cracking-Resistant

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

A Residential Solution

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

Product Performance

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

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.
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 millimetres after 8,000 cycles at standard PGAC high temperatures, AASHTO TP 63
Minimum fatigue resistance to failure of 230,000 cycles at 480 μmand 18 degrees C (AASHTO T 321)
Reduced tire noise by 8 dB (1.0 millimetre offset X 1.0 millimetre height roadside measurement).

Download

Product Data Sheet Durawhisper
(pdf, 1.37 MB)

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 Availability

British Columbia
Alberta
Manitoba: Depends on Project
Saskatchewan: Depends on Project
Ontario
Québec
Nova Scotia