Increase Profit with
Recycled Asphalt Shingles
Treating Asphalt Shingles with Advera® WMA
Recycled Asphalt Shingles (RAS)
In Asphalt Pavement
TABLE 1: The Cost Reduction of
Increasing RAS with Advera® WMA
Recycled Asphalt Shingles (“RAS”) is sourced from either
manufacturer’s waste or post-consumer tear-off shingles.
RAS is a source of profit in asphalt mix as it typically contains 20-30% asphalt binder. When added to asphalt mix
significant profit can be realized; estimated to be $1.25 per
ton of mix for every 1% increase of RAS in the mix.
However, with financial benefits can come potential
headaches. There are three common problems limiting the
use of RAS in asphalt pavements and also limiting the
opportunity to increase profits: 1) Clumps in the stockpile
and mix; 2) Inconsistent feed rate causing inconsistent mix
results; and 3) a stiffer, more difficult mix to handle and
compact for paving crews.
Advera® WMA can solve all of these problems allowing
increased profits.
stockpile reduces the time, cost, and additional equipment
needed to rework the RAS to a usable condition.
Advera® WMA pre-blended with RAS at as little as 1% by
weight can reduce clumps in the stockpile. A free-flowing
Often contractors will blend sand or reclaimed asphalt
pavement (“RAP”) with RAS to reduce stockpile issues.
But sand is needed at a higher percentage loading to control clumps, and this can cause issues with mix designs.
RAP can be used, but often there is a concern regarding
the consistency of the blend and the variability of the
asphalt binder content from the estimated 5% in the RAP to
20+% in shingles. Furthermore, blending RAS with sand or
RAP does not improve the workability of the mix for paving.
Untreated RAS after 3 months (manufacturer’s waste)
Treated RAS after 6 months (manufacturer’s waste)
Stock-Pile Flow Aid – Clumps can form due to moisture,
heat and/or weight of the shingles. Clumps that make their
way into the paver can cause dragging, poor pavement
smoothness, soft spots, and inconsistent densities.
Shingle Treatment with
More Consistent Feed Rate and Mix Quality –
When clumping is eliminated, the shingles are more evenly
distributed in the mix. Since RAS contains 20-30 % asphalt
binder, inconsistent feed rate can greatly change the asphalt
content of the mix, which can give inconsistent densities
and volumetrics. Advera® WMA promotes consistent RAS
feed rates into the mix plant and this leads to more consistent mix properties.
How To Treat RAS
RAS can be treated in a myriad of ways:
A dvera WMA
®
Workability and Compaction – Use of recycled shingles
can make a stiffer, more difficult to handle mix. RAS treated
with Advera® WMA has the added benefit of excellent mix
workability and compactability, even at higher RAS loadings.
No additional feed equipment is needed to introduce the
material into the plant - use existing RAS hoppers. Maximize
the recycle content in the mix, maintain workability, and
lower mix cost.
Lower Binder Cost – The value of the Asphalt Cement
(“AC”) in RAS is typically higher because there is more AC
in RAS than RAP. Even if the percent of replacement
binder in a mix design has been realized, AC cost savings
are realized by increasing the RAS content and decreasing
the RAP content in the mix.
Warm Mix Asphalt is Coming! – Can you still use RAS?
Yes! With Advera® WMA treated RAS workability and compaction can be obtained at hot or warm temperatures.
Auger Advera® WMA
into the grinder.
Advera® WMA treated RAS can be used alone or in combination with existing warm mix asphalt technologies.
Advera® WMA is available in bulk bags and bulk.
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Advera® WMA onto
any process belt.
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Increase Profit
Stockpile Aid
Workability Aid
Asphalt Binder Savings
Improve Mix Quality
Synergy with Existing Technologies
Visit www.adverawma.com for videos of Advera WMA
and Shingles.
Auger Advera®
WMA at the
Trommel Screen.
For more information, contact PQ Customer Service at 1-800-944-7411
Or in Canada at 416-255-7771
Although the information and suggestions in this brochure ("information") are believed to be correct, PQ Corporation makes no representations or warranties as to the completeness or accuracy of the information. The information is supplied
upon the following conditions: The persons receiving the information will determine its suitability for their purposes; PQ Corporation will not be responsible for damages of any nature whatsoever resulting from the use of, or reliance upon, the
information or the materials, devices or products to which the information refers; No information is to be construed as a recommendation to use any product, process, equipment or formulation in conflict with any patent; PQ Corporation makes
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Copyright © 2012 by PQ Corporation. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise,
without the prior permission of the publisher and copyright holder. WMA1011