Promotora Mediterránea-2, S. A. (PROMSA) is a company part of the Cementos Molins group that sells construction materials such as concrete, aggregate and mortar. The company is also dedicated to the recycling of materials and the recovery of waste aimed to produce refused derived fuel (RDF). During the distribution of the materials to the different customers, concrete goes back to the PROMSA manufacturing plant. The returned concrete can be of 1 or 2 m3 (interesting volumes from 2 m3). This is considered waste together with the concrete exceeding from the production of fresh concrete. The co