Uso de nanotecnología para el incremento de la resistencia a la humedad en mezclas asfálticas fabricadas para la ciudad de Bogotá D.C.

Abstract

The critical point of the damage suffered by the pavement is its susceptibility to the effects it experiences due to damage caused by water. Said damage mechanism, coupled with the constant growth of the vehicle fleet, helps to reduce the durability of pavement structures. To increase the resistance to moisture damage of asphalt mixtures, multiple studies have been carried out around the world. In general, the state of knowledge reports the use of different additives for this purpose. Within these additives, those manufactured at the nanometric scale offer a wide opportunity for use since they are generally used in low dosages, are highly manageable and easy to store. The main objective of this work was to comparatively evaluate the resistance to moisture damage of an asphalt mixture MD-19 with conventional asphalt CA-14, with respect to an asphalt mixture MD-19 with asphalt cement CA-14 (IDU specifications, 2018). incorporating the INASOL® HB 1218 additive with nanotechnological characteristics in three dosages (0.05%, 0.10%, 0.15% with respect to the weight of the asphalt). To evaluate the resistance to moisture damage and the performance of the control mixtures and those modified with the additive, the tests were carried out, Marshall (INV. E-748), indirect traction to measure the TSR parameter (Tensile Strength Ratio, INV. E -725), adherence in tray (INV. E-740), Riedel Weber (INV. E-744), effect of boiled water (INV. E-757) and Cántabro (INV. E-760). The asphalt mixture to which the INASOL® HB1218 additive was added obtained a significant improvement, compared to a conventional asphalt mixture. This was due to the fact that the asphalt with the additive, when mixed with the aggregates, creates a highly adherent hydrophobic film, avoiding the infiltration of water that can deteriorate the asphalt mixture, obtaining a high resistance to moisture damage. This based on the results obtained by the adhesion tests in tray, indirect traction (TSR), Riedel-Weber and Cántabro, in these results it was possible to appreciate a significant increase endorsed by an ANOVA statistical analysis carried out on the results obtained.