|Table of Contents|

Aging performance of extracted oil activated waste rubber powder modified asphalt(PDF)

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

Issue:
2024年2期
Page:
22-33
Research Field:
道路工程
Publishing date:

Info

Title:
Aging performance of extracted oil activated waste rubber powder modified asphalt
Author(s):
KONG Pei-pei1;  FU Liu-xu2;  XU Gang1;  CHEN Xian-hua1;  ZHANG Jiu-yang3;  ZHANG Chao4
(1. School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China; 2. Sichuan Digital Transportation Technology Co. Ltd., Chengdu 610095, Sichuan, China; 3. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, Jiangsu, China; 4. Huzhou Huaxing Urban Construction Development Co. Ltd., Huzhou 313000, Zhejiang, China)
Keywords:
road engineering;  ARMA;  experimental research;  aging performance
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2024.02.003
Abstract:
To investigate the aging performance and aging mechanism of the extracted oil activated waste rubber powder modified asphalt(ARMA), the indoor accelerated aging tests were conducted to simulate both short-term aging and long-term aging of ARMA. And the dynamic shear rheometer, Fourier infrared spectroscopy, four component analysis, elemental analysis, and scanning electron microscope were adopted to investigate the aging performance and microstructure of ARMA under different aging conditions. The results show that with the deepening of the aging degree, the complex shear modulus, rutting factors and fatigue factors of ARMA gradually increase, but the phase angle gradually decreases. The changes of the complex shear modulus, phase angle and the corresponding aging index of ARMA are smaller than those of the waste rubber powder modified asphalt(RMA). The content of saturated fraction, aromatic fraction and resin in ARMA decrease with the aging intensity, while the content of asphaltene increases. The content of carbon and hydrogen in ARMA decrease with the aging intensity, but the content of oxygen and sulfur, as well as the aromatic carbon ratio and the ring structure condensation index show the opposite trend. The intensity of the carbonyl and sulfoxide peaks in the infrared spectra of ARMA increase with the deepening of the aging degree, and the corresponding carbonyl and sulfoxide aging indices increase. The intensity of CC peak in the infrared spectra of ARMA decrease with aging, and the corresponding butadiene aging index also decreases. The interfacial bonding ability between the activated waste rubber powder and base asphalt in ARMA on the microscopic morphology graph gradually weakens with aging, and the activated waste rubber powder gradually protrudes from base asphalt. The anti-aging mechanism of ARMA is that activation enhances the activity of waste rubber powder, which makes the waste rubber powder and the base asphalt form a stable colloidal structure, thus hindering the erosion of oxygen on the colloidal structure during the aging process, and realizing the improvement of anti-aging ability of activated waste rubber powder modified asphalt.5 tabs, 9 figs, 28 refs.

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Last Update: 2024-03-01