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Dynamic modulus characteristics of modified coldrecycled mixture with asphalt emulsions(PDF)

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

Issue:
2020年6期
Page:
35-46
Research Field:
道路工程
Publishing date:

Info

Title:
Dynamic modulus characteristics of modified coldrecycled mixture with asphalt emulsions
Author(s):
WANG Decai1; 2;  CHANG Haolei2;  HAO Peiwen3;  CAI Yingchun2
（1. School of Civil Engineering and Communication, North China University of Water Resources andElectric Power, Zhengzhou 450045, Henan, China; 2. School of Water Conservancy and Environment,Zhengzhou University, Zhengzhou 450000, Henan, China; 3. Key Laboratory for Special Region HighwayEngineering of Ministry of Education, Changan University, Xian 710064, Shaanxi, China）
Keywords:
road engineering;  cold recycled of asphalt emulsion;  dynamic modulus;  modification mean;  grey entropy correlation
PACS:
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DOI:
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Abstract:
In order to comply with the new dynamic design method of asphalt pavement and further understand the dynamic modulus of modified cold recycled mixture with asphalt emulsions (CRME), uniaxial compression dynamic modulus test and rutting test were carried out about different CRME with rejuvenation agent (RA), basalt fiber (BF), Buton rock asphalt (BRA) and SBR latex modified. The principle of timetemperature equivalence was used to translate the dynamic modulus of the CRME at different temperatures to form principal curves, and the best admixture and the best content of the admixture were obtained through image comparison. Finally, the correlation between dynamic modulus and dynamic stability was analyzed base on grey entropy theory. The results show that the viscoelastic properties of the CRME are similar to those of ordinary hotmixed (unmodified) asphalt mixtures. The additive RA can significantly improve the viscoelastic properties of the CRME and reduce the amount of emulsified asphalt. But the amount of RA is not as much as possible, according to the dynamic modulus test, the optimum dosage of RA is 8%. Using sigmoidal function, the master curves of dynamic modulus of the seven different CRME are established, which show Sshaped flat curve characteristics. Under the same gradation and asphalt aggregate ratio, both BRA and SBR latex modification methods can improve the high temperature performance of CRME, while BF modification and RA modification with 4%, 8% and 12% respectively, it have negative effects on hightemperature performance of the CRME. Compared with unmodified CRME, the dynamic stability of SBR latex and BRA modified CRME increased by 18.6% and 5.5%. However, when CRME with BF or mixed with 4%, 8% and 12% of RA, the dynamic stability of the CRME decreased by 10.8%, 12%, 30.1% and 51.7%. The grey entropy correlation analysis shows that the correlation between dynamic modulus and dynamic stability of CRME is pretty good. The test results have a certain technical reference value for improving the dynamic modulus of CRME and its application in road maintenance design. 6 tabs, 11 figs, 28 refs.

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Last Update: 2020-12-17