https://arpi.unipi.it/bitstream/11568/798598/2/polacco%20798598.pdf

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

The use of polymer-modified binders in asphalt mixtures has become more widespread due to their reduced thermal susceptibility and improved rutting and fatigue resistance. Nevertheless, their high cost limits their application, thus making the use of reclaimed polymers (RP) an interesting alternative for both reducing price and extending the service life of pavements. This paper; therefore, presents a comparative review of the recycled polymers most commonly studied as bitumen modifiers: polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), ethyl vinyl acetate (EVA), and ground tire rubber (GTR), in order to facilitate their selection and extend the use of the bitumen. The differences in terms of melting point, mixing conditions, and maximum quantity of added polymer are analyzed. Moreover, their effect on the mechanical behavior of the asphalt binders and their stability with and without the use of additives is presented. According to the literature revision, the performance of the new binder is more influenced by the kind of polymer that was incorporated and the mixing conditions than by the base bitumen that was chosen, although rheological evaluation is needed to fully understand the modification mechanisms of the modified binder. In general terms, plastomers have a stronger effect in terms of increasing the stiffness of the bitumen in comparison with crumb rubber (elastomers), thus providing an improved rutting resistance. The joint use of polyethylene (plastomer) and crumb rubber (elastomer) can be an interesting option for its recycling potential and mechanical performance, although further study is needed to achieve stable bitumen across the entire range of temperatures; additives, such as maleic anhydride (MA), are commonly employed to improve the stability of the binder and enhance its characteristics, but their use could limit the economic benefits of using recycled materials.

Reclaimed Polymers as Asphalt Binder Modifiers for More Sustainable Roads: A Review

Repurposing waste plastics into cleaner asphalt pavement materials: A critical literature review

The use of polyurethane for asphalt pavement engineering applications: A state-of-the-art review

Modification mechanism of asphalt binder with waste tire rubber and recycled polyethylene

Study on the classical and rheological properties of castor oil-polyurethane pre polymer (C-PU) modified asphalt☆

Effect of linear low density-polyethylene grafted with maleic anhydride (LLDPE-g-MAH) on properties of high density-polyethylene/styrene–butadiene–styrene (HDPE/SBS) modified asphalt

The invention provides a modified biological asphalt material, a biological asphalt mixture, a preparation method thereof and applications. The modified biological asphalt material is prepared by a mixture of a biological asphalt compound, a modifying agent, a compatilizer and a stabilizing agent. The preparation method is simple and easy to practice, the pollution is low in a production process, and raw materials are simple and easy to obtain. The obtained modified biological asphalt material can be directly used as road asphalt for mixture production. The biological asphalt mixture and the preparation method thereof are provided, and the obtained biological asphalt mixture can be used for paving roads.

Modified biological asphalt material, biological asphalt mixture, preparation method thereof and applications

The invention relates to activated waste rubber powder and a preparation method thereof. The activated waste rubber powder is prepared from a mixture containing waste rubber powder, a softener and/or a rubber activating agent. The invention also relates to a waste rubber powder modified asphalt and a preparation method thereof. The waste rubber powder modified asphalt is prepared from a mixture containing base asphalt and the activated waste rubber powder. The activated waste rubber powder and the base asphalt have favorable compatibility, and the modified asphalt containing the activated waste rubber powder can have favorable storage stability, high temperature property and ageing-resistant performance and lower cost. In addition, the preparation methods of the activated waste rubber powder and the modified asphalt are simple in process and convenient to operate.

Activated waste rubber powder and preparation method thereof as well as modified asphalt and preparation method thereof

High-viscosity modified asphalt (T-HVA) specifically used for drainage/permeable asphalt pavement was prepared by composite modification of matrix asphalt using a thermoplastic elastomer (TPE) and SBS particles. The performance of the high-viscosity modified asphalt (T-HVA) was characterized by conventional tests, and compared with the performance of 70# asphalt, SBS modified asphalt and engineering high-viscosity asphalt. The results show that all the indicators of the modified asphalt are better than that of the matrix asphalt, and the dynamic viscosity of the T-HVA is greater than one million Pa.s, which is much higher than that of the engineering high-viscosity asphalt and SBS modified asphalt. The segregation test shows that the compatibility and stability of T-HVA asphalt are better than others. Cohesion test shows that the cohesion of the modified asphalt is obviously better than that of the matrix asphalt at different temperatures, and the higher the temperature, the better the cohesion, and the cohesion of the T-HVA before and after aging is relatively stable. The result of the peeling rate measured by ultraviolet spectrophotometry shows that: the peeling rate of the T-HVA is the smallest, i.e., the adhesion is the best, and is consistent with the dynamic viscosity, i.e., the greater the dynamic viscosity, the better the adhesion. Based on the comprehensive analysis of various indicators. The results of Performance Grade (PG) grading test show that T-HVA has good high and low temperature performance. The modified materials with good dispersion in asphalt and the TPE particles as high elastic interlocking units are uniformly distributed in the network structure; The T-HVA has relatively strong aggregate adhesion and cohesiveness, exhibits good high temperature stability and low temperature flexibility, and is suitable for drainage/permeable asphalt pavement.

Haiyan Zhang

Papers

Study on the classical and rheological properties of castor oil-polyurethane pre polymer (C-PU) modified asphalt☆

Effect of linear low density-polyethylene grafted with maleic anhydride (LLDPE-g-MAH) on properties of high density-polyethylene/styrene–butadiene–styrene (HDPE/SBS) modified asphalt

Modified biological asphalt material, biological asphalt mixture, preparation method thereof and applications

Activated waste rubber powder and preparation method thereof as well as modified asphalt and preparation method thereof

Study on cohesion and adhesion of high-viscosity modified asphalt