Bitumen chemical modification by a thermoplastic polymer

Abstract

Oil road bitumen was modified by a copolymer of ethylene with vinyl acetate (EVA) and 3-glycidyloxypropyltrimethoxysilane (epoxysilane). These modifiers were simultaneously introduced into the BND 90/130 oil bitumen at a temperature of 165 °C. The components were mixed up during two hours with further isothermal holding at the same temperature during the required period. Epoxysilane crosslinks bitumen with EVA making it possible to obtain an immiscible bitumen polymer binder. The optimal content of EVA is 12 mph, epoxysilane -3 mph with a mixing time of 4 hours. The optimal bitumen polymer binder is characterized by the following properties: softening point of 66 °C, penetration at 25 °C = 50, penetration index of 2.15, brittleness temperature of -22 ° C. Separation is significantly reduced. NMR spectroscopy has revealed that the introduction of the binding agent to the bitumen-polymer binder does not create low-mobile structures. It allows forecasting the high binder stability during storage and transportation.

The Effect of the Microstructure and Viscosity of Modified Bitumen on the Strength of Asphalt Concrete

“…In parallel with this process, another component of AG-4I-polyisobutylene, spreading between bitumen microassociates, forms an intermolecular polymer network inside the bulk phase of the dispersed system. The development of homoassociation processes in the concentration range of 1.0-2.0 g/dm 3 AG-4I (Figure 2, curve 1) is confirmed by the results of viscometric analysis: specific viscosity increases from 0.02 to 0.74, i.e., almost 37 times, which corresponds to the results obtained in works [14,34].…”

Uso de etileno vinil acetato (EVA) en mezcla asfáltica: Una revisión literaria

“…El copolímero semicristalino EVA, es un plastómero que se utiliza con mucha frecuencia en pavimentos, y que provoca cambios en el estado físico, químico y propiedades morfológicas del aglutinante asfáltico (Mansourian, Goahri, y Khosrowshahi, 2019). Es capaz de formar una red resistente a la deformación dentro del betún mejorando así la elasticidad, propiedades de cohesión y adherencia (Ayupov, Khakimullin, y Kazakulov, 2020). EVA consta de 5% a 50% en peso de VA, los grupos de acetato en la cadena de etileno disminuyen la cristalinidad del copolímero cuyas propiedades son controladas por la cantidad de VA en la estructura (Alatas y Yilmaz, 2017).…”

Determination of the softening temperature of bitumen with different modifiers

“…is a sharp drop in ambient temperature within a short period of time and severe weather conditions. At the same time, the service life of the pavement is affected by the quality of the bitumen used, which is one of the important components of the road surface in almost all categories of roads around the world [4][5].…”