Valorization of residual granular materials

The recovery of residual granular materials during road repair work


Every year in Quebec, road repair projects generate significant quantities of residual granular materials. These residual granular materials are mainly crushed stone, concrete and residual bituminous coating.

The Guide d’application du RVMR (2023) defines what crushed stone, concrete and residual bituminous coating consist of. The definitions of residual concrete and bituminous coating are intuitive, however, that of crushed stone is less so. Residual crushed stone generated during demolition work on civil engineering works is defined as a natural granular material having undergone screening and/or crushing during its manufacture, and which is present in a distinct horizon.

Valorization of residual granular materials

The valorization of residual granular materials is firstly governed by the Regulation respecting the regulatory scheme applying to activities on the basis of their environmental impact. This defines the conditions under which the recovery of residual materials is exempt from ministerial authorization. The Regulation respecting the reclamation of residual materials then defines the standards to be respected (nature, composition and levels of contaminants for example) in this latter situation and the possibilities of recovery following a categorization of residual granular materials.

The advantages of recovering residual granular materials

The main advantage of valorizing residual granular materials is cost reduction. For example, it is common to find C10 to C50 petroleum hydrocarbon contents between 700 and 3500 ppm in the foundation of a road following an environmental characterization. Such a content may be due to previous spraying of dust suppressants. In the past, residual crushed stone was more often than not used as soil, and such a C10 to C50 HP content meant that it could only be used on the site of origin (soil in range B-C of the du Guide – Soil Protection and Contaminated Sites Rehabilitation of the MELCCFP). Other avenues of recovery existed (technical landfill, visual, noise or security screens for example), but had several limitations (volumes that could be recovered and real opportunities for recovery, for example). A residual crushed stone that has a content between 700 and 3500 ppm in HP C10 to C50 can be a category 3 of the RVMR (if the other required parameters also categorize it) and it can be valorized off-site in numerous ways, including foundation material, sub-foundation or road embankment.

Landfill: Other alternatives

The alternative to recovery is landfilling and the cost per ton can reach up to $200/ton. This high cost and the quantities of residual granular materials generated on site can ultimately represent a significant sum which could otherwise have been invested in more “interesting” aspects of the renovation project.

Avizo, partner of choice

Avizo is capable of characterizing the residual granular materials in view of the valorization according to the RVMR, before or during your project. A characterization of residual granular materials can be carried out alone or integrated into the environmental site assessment process, phases I and II as required in the context of certain projects requiring ministerial authorization, since the Guide de caractérisation des terrains du MELCCFP considers aggregates as one of the mediums that must be evaluated during the process.


Shaun Gelati


Let's talk about your project

Get a quote

Trust our Highly Qualified Team of Engineering Consultants.

Contact us now to benefit from our expertise in providing personalized and sustainable solutions for your water management concerns.

Request a Quote

Phone: 1-800-563-2005

Email: [email protected]

25 Mozart Avenue E, Suite 201
Montreal H2S 1B1
4495, Boulevard Wilfrid Hamel, Québec, local 240
Québec G1P 2J7
1994 Michelin Street
Laval H7L 5C2
1125 Cherbourg Street
Sherbrooke J1K 0A8
330 Cormier Street
Drummondville J2C 7L9
150 Saint-Jacques Street
Granby J2G 8V6

Contact our experts

Complete this form so that our experts will contact you and offer assistance tailored to your situation.

Demande de soumission
Desired services
Sols, réhabilitation et valorisation
Natural Environments and Watercourses
Urban water
Gauging and Calibration of Measurement Equipment
Urban infrastructure and transport
Permits and Authorization

Flowmeter identification

Applicable regulations
Is it possible to vary the flow rate manually?
Is the measuring system located in an enclosed space?
Is it possible to provide us with a person who will help our technician during the job in a confined space?

Maximum file size: 2.1MB

This form is intended to collect the information necessary for us to provide you with a quality service, by giving you the information you request from us. To find out more, consult our privacy policy and protection of personal information page.