In Spain the rate of youth unemployment has exponentially increased in the past few years, and it has turned into a structural problem. When the fourth quarter of 2014 ended, the destruction of employment, which begun along with the economic and financial crisis in 2008, has specially affected...

With the development of societies there is a growing demand for raw materials for the construction industry, among which the crushed materials existing in the various categories, as set down the specifications of the services of competent bodies. In the long term and as a result of overuse such...