|Table of Contents|

Preparation and performance of high-viscosity modified asphalt for drainage asphalt pavement(PDF)

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

Issue:
2023年1期
Page:
1-9
Research Field:
道路工程
Publishing date:

Info

Title:
Preparation and performance of high-viscosity modified asphalt for drainage asphalt pavement
Author(s):
ZHANG Zeng-ping;  CHEN Li-qi;  HUANG Ting;  BAN Xiao-yi;  LIU Hao
(Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China)
Keywords:
road engineering;  high-viscosity modifier;  modification mechanism;  rheological properties;  high-viscosity modified asphalt
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2023.01.001
Abstract:
To prepare a high-viscosity modifier for drainage asphalt pavements and reduce the preparation cost, a new high-viscosity modifier(N-HVM)was obtained by blending styrene-butadiene-styrene block copolymer(SBS), terpene resin(TR), and a small amount of plasticizer using melt blending process, the new high-viscosity asphalt(N-HVA)was prepared, and the modification effect was studied. Traditional TPS-HVA and SINOTPS-HVA were selected as the control group for comparative analysis. Firstly, the effects of different N-HVM dosing on the general physical properties of asphalt were investigated by needle penetration, softening point, 5 ℃ ductility, 60 ℃ dynamic viscosity, 135 ℃ Brookfield viscosity, and elastic recovery tests, the optimal dosing range of N-HVM was clarified. Secondly, the viscous-flow characteristics of high-viscosity modified asphalt were analyzed by viscosity test, and the modification mechanism of high-viscosity modified asphalt was analyzed by means of Fourier transform infrared spectroscopy(FTIR)test and differential scanning calorimetry(DSC)test. Finally, the dynamic shear rheology(DSR)and bending beam rheology(BBR)tests were used, to evaluate the high and low-temperature rheological properties of high-viscosity modified asphalt. The results show that the optimum N-HVM dosage(mass fraction, the same below)range from 14% to 18.5%, and the conventional physical properties of the prepared high-viscosity modified asphalt meet the specification requirements. The cost of N-HVM is only 30.8% and 67.1% of commercially available high-viscosity modifiers TPS and SINOTPS, which can significantly reduce the cost of using high-viscosity modified asphalt. Both physical modifications and chemical reactions occur during the blending process of base asphalt with N-HVM. The viscous flow activation energy Eη of N-HVA is smaller than TPS-HVA and SINOTPS-HVA, which has better temperature stability and construction ease. Compared with TPS and SINOTPS, N-HVM has a more significant effect on the high and low-temperature performance improvement of asphalt, and the modified asphalt has excellent high-temperature rutting resistance and low-temperature flexibility.4 tabs, 10 figs, 22 refs.

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Last Update: 2023-01-30