|Table of Contents|

Diffusion and blending degree between virgin and aged asphalts in warm recycling of foamed asphalt(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年5期
Page:
30-40
Research Field:
道路工程
Publishing date:

Info

Title:
Diffusion and blending degree between virgin and aged asphalts in warm recycling of foamed asphalt
Author(s):
XU Jin-zhi1;  ZHUANG Yan2;  ZHANG Bin-jun3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Gansu HATG Road Industry Co., Ltd., Lanzhou 730070, Gansu, China; 3. Engineering Design and Research Institute CCCC Second Highway Engineering Bureau Co., Ltd., Xi'an 710065, Shaanxi, China)
Keywords:
road engineering;  warm recycling of foamed asphalt;  diffusion and blending degree between virgin and aged asphalts;  rutting resistance factor;  fatigue life;  surface microscopic adhesion;  molecular weight distribution
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2025.05.003
Abstract:
To investigate the diffusion and blending degree between virgin and aged asphalts in warm recycling of foamed asphalt, a vertical layered distribution model was developed to carry out the simulation study. The foamed warm reclaimed asphalt in different layers formed after various times of diffusion and blending between foamed asphalt and aged asphalts, was separated and obtained by layered annular container. Dynamic shear rheology(DSR)test, linear amplitude scanning(LAS)test, atomic force microscopy(AFM)test, and gel permeation chromatography(GPC)test were applied respectively to analyze the macroscopic and microscopic technical properties of different foamed warm reclaimed asphalts, and the results were also compared with those of reclaimed asphalt formed with hot asphalt and rejuvenator. The results show that, from the interface of the two kinds of asphalts towards to the aged asphalt, the rutting resistance factor of foamed warm reclaimed asphalt in different layers and the content of large sized molecules gradually increase, while the fatigue life, surface microscopic adhesion force and the content of medium and small sized molecules gradually decrease, indicating the diffusion and blending degree of foamed asphalt in aged asphalt decreases with the increasing depth. The diffusion and blending degree between foamed asphalt and aged asphalt gradually raises with the extension of interaction time and the diffusion and blending between the two phases continue slowly under ambient conditions. Compared with foamed asphalt and hot asphalt, rejuvenator has a relatively better penetration and diffusion capacity in aged asphalt. The diffusion and blending degree between foamed asphalt and aged asphalt in warm recycling is similar to that between hot virgin asphalt and aged asphalt in hot recycling. No obvious discrepancy has been found about the reclaimed effect on aged asphalt with the two recycling methods.4 tabs, 11 figs, 29 refs.

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Last Update: 2025-09-30