Recycling

As a major producer and consumer of construction materials, Colas has developed ways to recover and recycle waste produced in road construction as well as materials resulting from demolition or renovation from public works or other industries.

01 Recycling

Recycling

As a major producer and consumer of construction materials, Colas has developed ways to recover and recycle waste produced in road construction as well as materials resulting from demolition or renovation from public works or other industries:

  • recycling plants: it is estimated that the average annual per capita consumption of aggregates in the advanced countries has reached 7 tonnes (only per capita water consumption is higher), more than half of which is consumed in public works. These figures clearly show the recycling potential of the Group's business activities. Colas devotes considerable resources to this end, with a network of plants able to recover and treat all types of debris, construction materials and industrial waste to produce gravel and aggregates. In 2016, 8.5 million tonnes were recycled by Colas throughout the world, corresponding to 11% of the Group's total production from its quarries and gravel pits, equivalent to the output of 17 medium-sized quarries.
  • bituminous asphalt mixes: bitumen is derived from petroleum and is becoming a rather rare commodity as refineries tend to favor other types of products. For this reason, the recovery of bitumen from worn road pavement surfaces is particularly expedient. In 2016, Colas used an average of 15% recycled asphalt mixes in its worldwide asphalt mix production, thus recovering about 285,000 tonnes of bitumen, equivalent to the annual bitumen yield of a medium-sized refinery, and nearly 5 million tonnes of aggregates (see above).
  • on-site recycling: the on-site recycling of pavement is an especially interesting technique used to limit purchases of materials and reduce transport costs (and thus our carbon footprint). More than 3.4 million sq.m of pavement were recycled on site in 2016.

02 Recycling records

Recycling records

Recycling records

 RAP contentTechniqueUseYearSubsidiaryDetailsKey figures
100% Cold mix (Valorcol) Heavy-duty pavement 2006
2007
COLAS Suisse Switzerland 100 % RAP on project to rebuild National Road Maintenance center, 5,000 m² in Bursins (Switzerland) 5 000 m2
100% In-place cold recycling (Novacol) Secondary roads 2008 COLAS SO France 100 % RAP with in-place recycling on 30, 800 m² in a 9-cm layer  (Route RD 939) 30,800 m2 on a 9-cm thick layer
80 à 85% Cold mix (Valorcol surface dressing) Secondary roads 2004
2007
COLAS SO France 80 to 85 % RAP with sand; recycling of surface dressing in experimental project supported by the government 9 500 t
50% Hot mix Expressways 2006 SACER SE-COLAS CO France High modulus road base asphalt concrete binder course on an 8,3 km section of Highway A71 27 000 t
49% Hot mix Tous types 2005 BARRETT 49 % RAP on average out of 150,000 t of total annual production at the Romulus plant (Michigan)  150 000 t
45% Hot mix Expressways 2007 BARRETT 45 % RAP on average out of 130,000 t of total annual production at the Troy plant (Michigan)  130 000 t
30% Hot mix Expressways 2006 SACER SE France Wearing course on a 7-km section of Highway A49 in porous asphalt. The RAP and new asphalt concrete contained elastomers  10,800 t
28% Hot mix All types 2008 COLAS Belgium 28% of RAP on average out of 380,000 t of total annual production at the VGB plant 380 000 t
27% Hot mix All types 2008 BRANSCOME USA 27 % RAP on average out of 2,000,000 t of total annual production in the subsidiary  2 000 000t
25% Hot mix
(wearing course)
Expressways 2004 COLAS NP France Wearing course on a 32-km section on Highway A26 32 km
21% Hot mix All types 2008 COLAS Belgium 21 % RAP on average out of  1,000,000 t of total annual production in the subsidiary 1 000 000t
20% Warm mix (3E+R) Automobile Racing circuit 2008 SCREG IDFN and SCREG NP France 20 % RAP on average in base course and wearing course, a total of 14,000 t of asphalt concrete applied on the 3,5-km long automobile circuit in La Ferté Gaucher  14 000 t
16% Hot mix  All types 2008 SCREG SE France 16% RAP on average out of 70,000 t of total annual production at the Montmélian Enrobés plant 70 000 t