Abstract
Abstract This study evaluated the modification effects of adding ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMGMA) in the presence of polyphosphoric acid (PPA) to an asphalt binder graded as 50/70 (0.1mm) in the Brazilian penetration grade specification (AC 50/70). The EMGMA terpolymer has been presented as a new alternative to modify asphalt binders properties, as scientific literature is scarce on its usage in this context and also on the role of PPA when used in combination with reactive polymers. The characteristics of the modified binder were analyzed by standard and rheological testing, including Multiple Stress Creep Recovery test (MSCR) and Fourier Transform Infrared Spectroscopy (FTIR) analysis. The MSCR test showed that the modified binder presented lower values of non-recoverable compliances (Jnr) and a higher percent recovery, when compared to the conventional binder. This behavior indicates that addition of EMGMA and PPA in asphalt binders could enhance the resistance to rutting of asphalt mixtures. The statistical evaluation showed that EMGMA had greater influence on the studied properties of Jnr (0.1kPa), MSCR recovery, softening point and elastic recovery at 25°C and that the PPA had also significant influence on these properties. FTIR analysis showed that chemical reactions occurred between the asphalt binder and EMGMA, forming a three-dimensional polymeric network, which promotes improved characteristics.
Highlights
Modified asphalt binders have been increasingly used The terpolymers reacts with the asphaltenes and develops in paving applications as an interesting alternative to deal a chemical bond network between micelles improving the with shortcoming of the petroleum asphalt cement (PAC). rheological properties of the asphalt binder
This study evaluated the modification effects of adding ethylene-methyl acrylate-glycidyl methacrylate terpolymer (EMGMA) in the presence of polyphosphoric acid (PPA) to an asphalt binder graded as 50/70 (0.1mm) in the Brazilian penetration grade specification (AC 50/70)
Considering that scientific literature on the use of EMGMA terpolymer as asphalt binder modifier is scarce and the PPA function is not clear when used in combination with reactive polymers, this paper presents a laboratorial study of the thermal and rheological behavior for an asphalt binder modified with EMGMA in the presence of PPA in order to understand the polymer and PPA action and the components interactions
Summary
Modified asphalt binders have been increasingly used The terpolymers reacts with the asphaltenes and develops in paving applications as an interesting alternative to deal a chemical bond network between micelles improving the with shortcoming of the petroleum asphalt cement (PAC). rheological properties of the asphalt binder. The same some deficiencies and enhancing asphalt concrete properties reaction may happen through an amino group, and once such as resistance to rutting and cracking and reducing the the epoxy ring is open, crosslinking between the polymer damage due to fatigue and thermal susceptibility[1]. According to standard tests of penetration, softening of asphalts binders Their reactivity is due to the presence of point, rotational viscosity and aging, the modified asphalt functional groups that are able to interact with the carboxyl binder with EBGMA became more consistent and with less groups of the asphaltenes. It was reported that the addition of 1% EBGMA between 800-3500 g/mol, and each micelle has a large terpolymer improved the rheological properties of the binder, number of available carboxyl groups, as shown in Figure 1. providing greater resistance to rutting[5]
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