CHEMOMECHANICAL PROPERTIES OF FRC BASED ON NON-TRADITIONAL FIBERS

摘要

The fibers play very important role particularly during curing process of concrete, as they suppress local cracking and warping in the composite. Very important fact follows from plenty of experimental studies: since fibers have different stiffness from concrete itself, interfacial mechanical properties have to be solved when requiring knowledge about the bearing capacity of the structure. From this it follows that the values of parameters for contact conditions are very important. Simultaneously, the chemical, numerical, and mechanical results have to be compared at different stages of curing process of concrete. This will be carried out for one of non-traditional materials of fibers, which appears to be very cheap and need recycling. We are going to treat modified waste PET bottle (polyethylene terepthalate) fibers in this paper, which should substitute local reinforcement in plasters of old buildings. Mechanical properties are calculated from convergence procedure involving numerical and chemical (mechanical) tests. Chemical properties of interfacial zones of concrete and fibers are studied by the Raman spectroscopy. Couple of exam- pies will demonstrate the ability of the approach above mentioned.