Influence of modification process parameters on the properties of crumb rubber/EVA modified asphalt

Abstract

Crumb rubber (CR) and ethylene vinyl acetate copolymer (EVA) were adopted as asphalt modifiers. Routine tests, softening point, penetration, and ductility were used to evaluate the basic properties of crumb rubber and ethylene vinyl acetate copolymers (CR/EVA) modified asphalt. The segregation experiment measured the storage stability. Modern test methods such as fluorescence microscopic photography technology was used to study stability of polymer modified asphalt. Infrared spectrum experiment was used to analyze the composition differences of the upper part and lower part of CR/EVA modified asphalt. Matlab software was employed to fit out the formulae of ductility, penetration, and softening point difference of modified asphalt and shearing temperature, shearing time and shearing rate separately. Compared with base asphalt, the properties of CR/EVA modified asphalt have been greatly improved. The formulae which were fitted out by Matlab software showed that the shearing time was the foremost factor affecting the properties of CR/EVA modified asphalt, followed by shearing temperature, and the last was shearing rate. The conclusions which were fitted by orthogonal experiment were basically consistent with the results of formulae which were fitted out by Matlab software.

Investigation of the Effect of Crumb Rubber Powder and Warm Additives on Moisture Resistance of SMA Mixtures

“…Fang et al by investigating the effect of crumb rubber/ethylene vinyl acetate copolymer on asphalt mixture properties indicated that the softening point difference was almost less than 2.5 degrees. Moreover, the compatibility of modifiers and asphalt improved to a certain extent, and the degree of segregation became small and the storage became steady [52], which is in accordance with the results of this research. However, some studies have not conducted this test, and in order to decrease segregation, Table 9: e properties of cellulose fibers used.…”

Synthesis and evaluation of high‐temperature properties of butylated graphene oxide composite incorporated SBS (C4H9‐GO/SBS)‐modified asphalt

“…As represented in Table that after the segregation test, the difference in softening point of each group of modified asphalt considerably changed. The difference in softening point of GNPs modified asphalt was 3.5 °C suggesting prone nature of GNPs and in turn the resulting modified asphalt to segregated agglomeration . On the contrary, the difference in softening point of C 4 H 9 ‐GO‐modified asphalt (0.3 °C) was lower than that of SBS‐modified version indicating higher resistance to segregation of the former than the latter.…”

Asphalt Incorporation with Ethylene Vinyl Acetate (EVA) Copolymer and Natural Rubber (NR) Thermoplastic Vulcanizates (TPVs): Effects of TPV Gel Content on Physical and Rheological Properties

“…Each TPV sample obtained from a previous section was cut into small pieces (≤2 mm) and gradually mixed with asphalt at 5 wt% using a high-speed shear mixer (L5M model, Silverson, Massachusetts, USA) at 150 °C with a rotor speed of 6000 rpm for 2 h and 3000 rpm for 2 h in order to remove air bubbles from asphalt. The protocol was adapted from Fang et al [ 35 ]. The suitable condition to mix EVA and crumb rubber (CR) with asphalt were a mixing temperature of 140 °C, mixing time of 1.5 h, and rotor speed of 3750 rpm.…”