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

Issue:

2026年01期

Page:

55-65

Research Field:

道路工程

Publishing date:

Info

Title:

Research on fatigue characteristics of reclaimed asphalt mastic based on modified VECD model

Author(s):

LIN Mei¹;  LEI Yu-tao¹; 2;  LIU Han-qing¹;  WANG Qiao-dan^3*;  LIU Wei-rong³

(1. School of Civil and Hydraulic Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2. Gansu Road and Bridge Shanjian Technology Co., Ltd., Lanzhou 730300, Gansu, China; 3. Gansu HATG Graphene Science and Technology Development Co., Ltd., Lanzhou 730311, Gansu, China)

Keywords:

pavement engineering;  reclaimed asphalt mastic;  modified VECD model;  fatigue damage;  fatigue life

PACS:

U414

DOI:

10.19721/j.cnki.1671-8879.2026.01.004

Abstract:

Six types of asphalt mastics with different filler-binder ratios were prepared by limestone, KL90 and extracted and regenerated asphalt from waste asphalt mixture. Based on linear amplitude sweep(LAS)tests, the fatigue performance of base asphalt and reclaimed asphalt mastics with different mineral powder types and filler-binder ratios was tested. With the help of viscoelastic continuous damage(VECD)theory, the maximum strain coefficient was introduced to modify the VECD model, and two failure determination methods, namely stress peak and initial modulus reduction of 35%, were used to comparatively analyze the fatigue failure and predict the life of base asphalt and reclaimed asphalt mastic. The research results indicate that the modified VECD model and simplified approach can effectively reduce the differences in fatigue life results caused by guessing the initial values of the model coefficients and the variability of parallel specimens. Under the same condition, the base asphalt mastic shows faster failure than the reclaimed asphalt mastic and exhibits irregular stress-strain change at loading strains of 17%-30%. This is due to the loss of viscoelastic characteristics of asphalt mastic caused by high strain condition. Compared to low filler-binder ratio specimens, high filler-binder ratio specimens have weaker ability to withstand high strain load. The increase in the filler-binder ratio increases the fatigue damage rate of asphalt mastic and shorten its fatigue life. This is because under high filler-binder ratio, the rigidity of asphalt mastic enhances and the asphalt film becomes thinner, exacerbating the stress concentration. The fatigue life of reclaimed asphalt mastic with the optimal dosage of rejuvenator can fully restore. It is recommended to use the stress peak failure points to analyze the fatigue performance of reclaimed asphalt mastic to avoid errors caused by excessive specimen variation coefficients and improve the reliability of the calculated fatigue life results. The calculated fatigue resistance of thick asphalt pavement structures is superior to that of thin pavement structures when the maximum strain is taken as 2.5% and 5.0%.8 tabs, 7 figs, 32 refs.

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Common functions

Last Update: 2026-02-20