Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (5): 1381-1389.doi: 10.13229/j.cnki.jdxbgxb.20210850

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Preparation and evaluation of RET/rubber composite modified asphalt and asphalt mixture

Sui-ning ZHENG(),Rui HE(),Tian-yu LU,Zi-yi XU,Hua-xin CHEN   

  1. School of Materials Science and Engineering，Chang'an University，Xi'an 710064，China
  • Received:2021-08-31 Online:2023-05-01 Published:2023-05-25
  • Contact: Rui HE E-mail:zhengsuining@163.com;heruia@163.com

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Abstract:

To determine the optimal ratio of reactive elastomer terpolymer（RET） and rubber modified asphalt， the quantitative relationship between asphalt performance and the content of RET， rubber and oil was comprehensively investigated based on Design-Expert. The modification mechanism of composite modified asphalt was investigated by Dynamic Shear Rheometer， Infrared Spectrometer and fluorescence microscope and the road performance and fatigue performance of composite modified asphalt were verified and evaluated. The results show that the relationship between asphalt performance and the content of RET and rubber is not linearly， the optimum content of RET， rubber powder and oil is respectively 1.69%， 16.52% and 1.83% of the asphalt. The RET/rubber powder composite system can react with asphalt to generate new absorption peaks， which weakens the boundary between the modifier and asphalt. Thus， the compatibility of rubber powder and asphalt and the low temperature performance of RET modified asphalt were improved， which can significantly improve the road performance of asphalt mixture.

Key words: road engineering, modified asphalt, reactive elastomeric terpolymer, rubber powder, component optimization, modified mechanism

CLC Number: 

  • U414

Table 1

Technical performance of matrix asphalt"

试验项目试验结果规定值
针入度/（25 ℃，0.1 mm）6660~80
软化点/℃50≥46
延度/（15 ℃，cm）>100≥100

Table 2

Test schemes of modified asphalt"

序号沥青/%RET/%胶粉/%油分/%
F11001.0101.5
F21001.0152.5
F31001.0203.5
F41001.5103.5
F51001.5151.5
F61001.5202.5
F71002.0102.5
F81002.0153.5
F91002.0201.5
JZ100---
JF100-203.5
RE1002--

Table 3

Test results of basic performance of modified asphalt"

序号针入度/（25 ℃，0.1 mm）软化点/℃延度/（5 ℃，cm）135 ℃粘度/（Pa·s）存储稳定性/℃
F15764.512.32.3511.7
F25166.015.42.7741.9
F34769.516.22.9272.2
F45573.011.22.4701.0
F55075.515.42.6071.9
F64774.517.63.0152.3
F75276.510.62.6720.8
F84778.015.72.7941.3
F94381.516.03.1542.4
JZ6650.08.30.528-
JF4558.517.72.8477.3
RE6165.07.82.1870.5

Table 4

Test desgin optimization and performance verification"

试验沥青/%RET/%胶粉/%油分/%针入度/（25 ℃，0.1 mm）软化点/℃延度/（5 ℃，cm）135 ℃粘度/（Pa·s）存储稳定性/℃
预测值1001.6916.521.834875.017.32.8091.78
试验值1001.6916.521.834975.517.22.7821.6

Fig.1

Change of G*/sinδ with temperature"

Fig.2

Change of δ with temperature"

Fig.3

Test results of fluorescence microscopy"

Fig.4

Test results of FI-TR"

Table 5

Gradation of AC-13 asphalt mixtures"

级配组成通过率/%
16 mm13.2 mm9.5 mm4.75 mm2.36 mm1.18 mm0.6 mm0.3 mm0.15 mm0.075 mm
级配上限100100856950392820168
级配下限100906939241310844
级配中值10095.278.454.638.827.219.614.410.06.5

Fig.5

Test results of road performance"

Fig.6

Fatigue results of asphalt mixtures"

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