The asphalt industry is moving toward a smarter future. Recycled asphalt pavement, or RAP, has been a cornerstone of the North American asphalt industry for decades. However, high RAP mixes resulted in premature cracking. Today, by combining balanced mix design, lab performance testing and the latest technologies, we can revisit the use of this vital resource in many markets of North America.
REARM HR combines two products to achieve the desired HIGH RAP percentage mix design. The first product is a highly engineered bio-oil to modify the virgin binder of the RAP mix. The second product is a treated para-aramid polymer fiber that reinforces the combined virgin and RAP binder to improve the rutting and cracking performance. The key to these performance improvements relies on the unique strengths of each product.
By varying the dosage of each product, 50% RAP usage can be obtained with improved performance.
An engineered Bio-oil, typically 1 to 5% of total binder content, is used to modify the virgin binder’s PG, which compensates for the added aged RAP binder. Surface Tech utilizes best-company-product examples of its bio-oil compliment. Initially, Surface Tech has partnered with Georgia-Pacific Chemicals, as an example, to marry their Tuff Trek 4007 with its para-aramid technology to satisfy the REARM specification. The current downloadable brochure is specific to GP’s partnership.
AQU-XP Polymer Fiber™ is used to reinforce the resulting combined binder with 10 to 20 million individual high strength 38mm aramid fibers, depending on dosage.
By varying the dosage of each product, 50% RAP usage can be obtained without sacrificing performance of the lower RAP design mix. In fact, improved performance can be achieved if desired.
At the Plant
Plant-introduced technologies are a SMART choice for asphalt producers.
The engineered Bio-oil and AQU-XP Polymer Fiber™ are introduced at the plant during production. This puts the control with the plant and allows for the HIGH RAP mixes to be started and stopped as necessary to accommodate other manufacturing needs. The Engineered Bio-oil is available in totes, tanker or rail cars and is in-line added to the virgin binder during production. AQU-XP Polymer Fiber™ is added to either the RAP Collar of a drum plant or the weigh hopper of a batch plant. Equipment for dosing both materials is available to purchase or rent with the purchase of the REARM HR technology from Surface Tech and/or their Distribution Partners.
The road to sustainability just got smoother. Surface Tech's REARM HR combines technologies to reshape the way we think about high-reclaimed asphalt pavement (high-RAP) mixes in road construction.
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