Analysis of creep under compression on impact noise insulation of cementitious plates with EVA waste

Abstract Impact noise in multi-floor buildings is reduced with the execution of a floating floor, which has a resilient material between the subfloor and the slab. In this study, the evaluation of the influence of compression of this material on the acoustic performance of the system was sought. Two resilient materials were compared, one being produced in the laboratory (cementitious plates with EVA - PEVA1,8 waste), and the other commercially (blanket recycled from PET waste - MantaPET). The measurements aiming to relate the dynamic stiffness of the materials and the acoustic performance were up to three years. Additionally, estimates were made for ten years, based on theoretical models and creep compression tests. While PEVA1,8 decreased its dynamic stiffness (20.0 MN/m³ to 17.7 MN/m³) over time, MantaPET increased (2.0 MN/m³ to 3.5 MN/m³), but both maintained intermediate performance (according to NBR 15575-3:2013) to impact noise, presenting L’ nT,w equal to 60 dB and 56 dB in a test floor, respectively. Estimates for ten years indicated less deformation for PEVA1,8 (3.42%), compared to MantaPET (20.15%) and confirmed the trend of changes in the dynamic stiffness, without compromising the acoustic performance of these materials.