Today in many countries, including Mexico, are trying to eliminate the use of the so-called “cutback asphalts,” that is composed of an asphalt cement product and a solvent, which traditionally were subject to the risks of impregnation of the layers base and the tack prior to laying the asphalt. Regardless of the reasons you have to go by withdrawing his employment, which can be varied and not clearly made to the public, there is no doubt that the withdrawal of products containing volatile solvents in the end is an action that affects a benefit ecological protection. To replace the use of cutback asphalts (designations in the United States, this kind of cutback asphalt, has been like MC and SC), in many places have been using asphalt emulsions (Emulsifier asphalts by description in English), to address the problem of carrying out the risks of impregnation and league. However, this procedure has not worked well in most cases. Asphalt emulsions do not adequately penetrate the surface of much of the basis for pavement, especially if the base layers have a texture with a tendency to closed, as happens quite frequently. Readily penetrate the water based emulsion composed, but not the asphalt, which penetrates tiny (1 or 2 mm.), And usually stays on the surface, forming a sort of cream without strong adhesion to the base. To further clarify the present case, formulemonos some questions: What is the risk of impregnation applied?.
Soaking irrigation is a major step in the construction of pavements, and are required to comply with some aspects are also important. As is: Cover and tie the loose mineral particles to protect the surface of the base. Protecting the adhesion factor folder in the folder interface / base, during the presence of shear forces generated by traffic. Tighten or strengthen the surface of the base layer. Waterproof the surface of the base layer. Clog the capillaries empty surface layer base. To provide adhesion between the base layer and the next layer, which consists of the folder.
What applies tack? Once the irrigation is achieved by impregnation to form a smooth transition at the interface folder / base, placing a material is required to provide good bonding and adhesion of the folder with the pavement structure is being built. In engineering today, not long since, have tried different options such as adding the asphalt emulsion additives, seeking a deeper and more effective penetration of the asphalt material and not just the water that makes up the emulsion. Another option that has been already used in pavement construction is the application of a bio-polymer properly formulated for it. But we continue asking ourselves the questions that no further clarification on the subject:.