The components of a bitumen system are currently among the products that has to have a CE mark, a European standard assessing the qualities of the product. CE marked products show that they have been inspected and evaluated for their compliance with the terms of the related regulations of health, safety and environment.
According to the Construction Products Regulation (CPR) put into effect in 2007, bitumen and bituminous mixtures cannot be put on the market if they do not have a CE mark. All bitumen and bituminous mixtures are subjected to European Standards in Turkey. The Quality Management System started to issue "Factory Production Control Conformity Certificate" for CE marking in bitumen and bituminous mixtures with the authorization it received in 2008.
The bitumen manufacturer should perform initial tests as required by the related bitumen and bituminous mixtures standard. It is necessary to establish a production control system for the products that are examined by those initial tests.
The production control system and the production facility established by the manufacturer according to the standard are inspected by the inspection team of Quality Management System. If the nonconformities spotted during the inspection are resolved within the specified periods, a Factory Production Control Conformity Certificate is issued at the end of the evaluation by the Quality Management System Certification Committee. Besides being mandatory, Factory Production Control Conformity Certificate is one of the determining factors while making a choice among different manufacturers of bitumen and bituminous mixture.
The durability, service quality and the cost of BHM (Bituminous Hot Mixture) coated roads are determined to a large extent by the qualities of the bituminous binder used in the mixture. Structural deterioration seen in road surfaces occurs either in the bituminous binder used in the construction or on the contact surface.
The deterioration seen at high temperatures occurs as the bitumen that becomes viscous flows towards the gaps of the coating layers. Cracks that develop at medium temperatures as longitudinal lines or in the shape of a crocodile ridge and the cracks that develop at low temperatures as lateral lines occur when the hardened bitumen breaks within itself or from the contact surface. Peeling and stripping caused by water occur because the bitumen loses its stickiness on the contact surface of the aggregate.
These deteriorations occur due to the viscoelasticity of bituminous binders. They behave differently at different temperatures and under different loading conditions. While it behaves like a viscous liquid at high temperatures and under long-term heavy loading, it reacts as a hard, elastic solid at low temperatures.
Bituminous binders are specified by means of a classification system based on their penetration value. This value is determined by measuring the consistency of bitumen at 25 ° C. Deteriorations are mostly due to the extremely low and extremely high temperatures which the coating is exposed to.
Due to certain inadequacies of the classification systems, a new classification method, a performance-based SUPERPAVE (Superior Performing Asphalt Pavement) binder classification system has been developed in the United States within the framework of the Strategic Highway Research Program (SHRP). In this system, bitumen is classified with respect to its mechanical and rheological properties and its performance in all temperature conditions, including high, medium and low temperature. At the end of the process they are given a "Performance Grade", PG. The numbers following the PG symbol show the average highest and average lowest coating temperatures where the binder will perform effectively.
You will make a high- quality and reliable choice if you prefer E-MAK bitumen systems.
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