Reclaimed Asphalt Pavement (RAP) and asphalt rejuvenators like ReLIXER® are transforming how the paving industry approaches sustainable, cost-effective road construction. Yet, despite decades of research and real-world use, misconceptions about RAP use remain.
Here's a straightforward look at 10 common myths about asphalt rejuvenation and the truths asphalt contractors and mix design engineers need to know.
Asphalt Rejuvenators: 10 Myths About Using RAP for Roadways
Myth 1: Additives are too expensive
Many believe incorporating rejuvenators adds unnecessary cost. In reality, effective rejuvenating agents like ReLIXER can reduce overall mix costs by restoring aged bitumen in RAP and reducing the need for virgin asphalt and fresh aggregates. Investing in quality additives often pays for itself in material savings and longer pavement life.
Myth 2: Additives don't work with RAP
Some contractors think asphalt additives are only effective in virgin mixes. The truth is that modern asphalt rejuvenators are specifically engineered for high-RAP content. ReLIXER, for instance, restores the functional properties of the aged bitumen in RAP, improving crack resistance and durability even in mixes with RAP content far above traditional 20% limits.
Myth 3: RAP content must be capped around 20%
Effective asphalt rejuvenators can allow RAP percentages of 40%, 50%, or even 100% without compromising performance. By effectively rejuvenating the aged binder, agents like ReLIXER make it possible to safely and efficiently push RAP content beyond outdated limits.
Myth 4: Additives complicate plant operations
Concerns about adding another material to the mix plant are common. In practice, user-friendly additives are designed for easy handling and low dosages. ReLIXER is non-hazardous, works with a range of bitumen and RAP types, and can be integrated seamlessly into existing operations without disrupting production.
Myth 5: Rejuvenators are harmful to the environment
Modern rejuvenators can be considered sustainable depending on their material content. ReLIXER is made from bio-based oils, contains no volatile organic compounds (VOCs), and has a lower greenhouse gas footprint compared to traditional treatments. Sripath also makes its Environmental Product Declarations (EPDs) available publicly on its website.
Myth 6: Rejuvenators only offer short-term benefits
Some assume rejuvenators simply soften old asphalt temporarily. In fact, an ideal rejuvenating agent restores the functional properties of aged bitumen to improve crack resistance and overall durability for the long term. When applied correctly, the benefits can translate into extended pavement life and reduced maintenance.
Myth 7: RAP mixes perform worse than virgin asphalt
Historically, high-RAP mixes were thought to be brittle or prone to cracking. With balanced mix designs and rejuvenators like ReLIXER, RAP mixes can achieve excellent roadway performance. Properly treated, recycled asphalt can match or even exceed the durability and functional performance of virgin asphalt pavements.
Myth 8: Additives are complicated to dose correctly
Some mix design engineers worry about precise dosing. Modern rejuvenators can be highly effective at low dosages, making them easy to measure and incorporate consistently. This can help ensure more predictable, high-quality results in every batch.
Myth 9: Rejuvenation slows down paving projects
Adding rejuvenators does not necessarily extend production timelines. When designed for plant use, products like ReLIXER are simple to handle and mix. They can allow contractors to maintain project schedules while using higher RAP content for cost and environmental savings.
Myth 10: Recycling asphalt is only for green initiatives
While sustainability is a key driver, RAP and asphalt rejuvenation can also make economic sense. Using high-RAP mixes with a reliable rejuvenator reduces the need for virgin bitumen and aggregates, lowering costs while delivering superior roadway performance.
Embracing the Future of High-RAP Paving
Dispelling myths about RAP and asphalt rejuvenation is essential for today's paving operations. Effective rejuvenators like ReLIXER can unlock the potential of RAP, reduce costs, simplify plant operations, and deliver durable, high-performing pavements. With balanced mix design and a quality rejuvenator, high-RAP asphalt is positioned to be the future of sustainable, cost-effective paving.
For more information about asphalt rejuvenation and ReLIXER, contact info@sripath.com
