Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (1): 183-190.doi: 10.13229/j.cnki.jdxbgxb20180882

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Investigation on low-temperature rheology and adhesion properties of salt-doped asphalt mortars

Rui XIONG1,2(),Ning QIAO1,Ci CHU1,Fa YANG3,Bo-wen GUAN1,2,Yan-ping SHENG1,2,Dong-yu NIU1,2   

  1. 1. School of Materials Science and Engineering, Chang′an University, Xi′an 710061, China
    2. Engineering Research Center of Transportation Materials of Ministry of Education, Xi′an 710061, China
    3. Yunnan Communications Investment and Construction Group Co. , Ltd. , Kunming 650228, China
  • Received:2018-08-25 Online:2020-01-01 Published:2020-02-06

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Abstract:

In order to explore the influence of salts on the low-temperature rheological properties and adhesion properties of asphalt mortars, preparation method of asphalt mortars with salt particles replacing mineral powder by volume ratio 1:1 and the bending beam rheological test (BBR) were used to study the effects of different salt-doped asphalt mortars on the low-temperature rheological properties at 30 d and 120 d test age. The corresponding Burgers model was built to analyze the effect of salinity on low temperature viscoelasticity of asphalt. Through the contact angle test, the surface energy parameters of asphalt were obtained, and the adhesion characteristics of different asphalt mortar were evaluated. Scanning electron microscopy (SEM) and infrared spectroscopy (FTIR) were used to explore the microscopic mechanism of salt-doped asphalt mortars. The results showed that compared with control asphalt, the rheological property of salt-doped asphalt mortars at low temperature decreases with the increase of age. At the age of 120d, the contact angles of asphalt increase obviously, the surface energy of salt-doped asphalt mortars decreases and its adhesion property degrades. The dissolution and crystallization process of salt particle and its salt aging effect are the main inducing factors of performance deterioration of salt-doped asphalt mortars.

Key words: road engineering, salt, asphalt mortar, low temperature rheological characteristic, contact angle, adhesion characteristic, salt aging effect

CLC Number: 

  • U416.217

Table1

Technical properties of SK?90# asphalt"

指标 单位 技术要求 试验结果 试验方法
针入度 15 ℃, 100 g, 5 s 0.1 mm － 43 T0604
25 ℃, 100 g, 5 s 80~100 86
30 ℃, 100 g, 5 s － 160
软化点（R&B） ℃ ≥44 47 T0606
延度（15 ℃，5 cm/min） cm ≥100 >180 T0605
闪点 ℃ ≥260 304 T0611
溶解度 % ≥99.5 99.8 T0607
密度（15 ℃） g/cm3 － 1.030 T0603

RTFOT

(163 ℃,75 min)

 质量变化 % ±0.8 0.15 T0610
残留针入度比（25 ℃） % ≥57 60.5 T0604
残留延度（10 ℃） cm ≥8 9.8 T0605

Table 2

Technical properties of mineral filler"

项目 单位 技术要求 试验结果 试验方法
表观密度 t/m3 ≥2.50 2.730 T0352
含水量 % ≤1 0.429 T0103
粒度范围<0.6 mm % 100 100 T0351
<0.15 mm % 90~100 97.8 T0351
<0.075 mm % 75~100 95.1 T0351
亲水系数 － <1 0.313 T0353

Table 3

Surface free energy parameters of three fluids mJ/m2 "

液体类型 γ L γ L d γ L p γ L + γ L -
蒸馏水 72.8 21.8 51.0 25.5 25.5
甘油 63.4 37.0 26.4 3.92 57.4
乙二醇 48.3 29.3 19.0 1.92 47.0

Fig.1

Stiffness modulus S and creep rate m of asphalt mortarsat different temperatures"

Fig.2

Example of Burgers model fitting curve"

Table 4

Results of Burgers’s parameters of asphalt mortars at different temperatures"

测试温度（龄期） 胶浆类型 E 1 /MPa η 1/(MPa·s) E 2/MPa η 2/(MPa·s) λ/s τ/s
-6 ℃（30 d） Matrix 346.79 4 932.53 196.72 937.23 14.2 4.8
LMF 782.53 12 554.31 290.73 2 474.54 16.0 8.5
Na2SO4 730.59 12 834.00 275.46 2 418.66 17.6 8.8
NaCl 714.15 13 042.15 287.76 2 589.70 18.3 9.0
-6 ℃（120 d） LMF 912.99 17 624.22 342.42 3 097.03 19.3 9.0
Na2SO4 768.39 15 581.16 318.66 2 793.52 20.3 8.8
NaCl 834.14 16 737.97 332.88 3 088.20 20.1 9.3
-12 ℃（30 d） Matrix 527.98 16 707.08 262.37 2 729.59 31.6 10.4
LMF 1 550.60 49 238.56 1 037.81 8 772.50 31.8 8.5
Na2SO4 1 266.20 63 975.90 741.95 9 754.37 50.5 13.1
NaCl 1 300.75 59 138.70 801.74 9 313.78 45.5 11.6
-12 ℃（120 d） LMF 1 560.36 72 375.70 835.49 9 732.53 46.4 11.6
Na2SO4 1 253.03 48 445.35 775.89 8 272.98 38.7 10.7
NaCl 1 415.10 73 947.00 923.02 11 223.95 52.3 12.2
-18 ℃（30 d） Matrix 798.17 68 529.06 688.81 9 428.90 85.9 13.7
LMF 2 091.98 234 840.90 2 209.36 34 816.08 112.3 15.8
Na2SO4 1 767.52 206 386.83 1 954.40 29 102.74 116.8 14.9
NaCl 1 712.29 208 508.50 1 826.30 27 738.74 121.8 15.2
-18 ℃（120 d） LMF 2 075.84 268 028.20 2 359.68 35 919.30 129.1 15.2
Na2SO4 1 981.75 241 741.30 2 131.77 32 158.26 122.0 15.1
NaCl 2 307.47 316 521.10 2 684.66 43 237.83 137.2 16.1
-24 ℃（30 d） Matrix 1 237.68 253 376.30 1 890.61 35 478.86 204.7 18.8
LMF 2 775.28 748 004.60 5 281.96 100 295.60 269.5 19.0
Na2SO4 2 600.22 678 850.88 5 183.93 94 999.29 261.1 18.3
NaCl 2 739.30 702 196.10 5 317.11 95 446.77 256.3 18.0
-24 ℃（120 d） LMF 2 680.40 797 835.35 6 048.74 93 376.07 297.7 15.4
Na2SO4 2 473.14 569 291.42 4 193.03 83 594.54 230.2 19.9
NaCl 2 961.77 923 043.40 6 426.94 129 106.5 311.7 20.1

Table 5

Low temperature index m/S for asphalt mortars"

测试温度（龄期） 基质沥青 LMF沥青胶浆 Na2SO4沥青胶浆 NaCl沥青胶浆
-6℃（30 d）

0.005 80

—

 0.004 93 0.00513 0.00491
-6℃（120 d） 0.003 55 0.00425 0.00402
-12℃（30 d） 0.004 56 0.001 33 0.001 44 0.001 24
-12℃(120 d) — 0.001 06 0.001 12 0.001 02
-18℃(30 d) 0.001 18 0.000 36 0.000 40 0.000 40
-18℃(120 d) — 0.000 31 0.000 35 0.000 27
-24℃(30 d) 0.000 36 0.000 13 0.000 17 0.000 13
-24℃(120 d) — 0.000 11 0.000 14 0.000 10

Table 6

Contact angle between asphalt mortarsand liquids"

胶浆类型 蒸馏水 甘油 乙二醇
均值/（°） 变异系数/% 均值/（°） 变异系数/% 均值/（°） 变异系数/%
Matrix 112.85 1.46 103.84 0.29 81.97 1.46
LMF30 117.64 1.22 105.72 0.35 82.58 1.41
LMF120 119.37 1.53 106.99 0.36 90.97 0.94
Na2SO430 117.54 1.75 108.38 0.71 82.35 1.51
Na2SO4120 118.10 0.58 109.16 0.98 86.70 0.99
NaCl30 115.51 1.54 106.37 0.79 91.29 0.64
NaCl120 119.81 1.87 108.23 0.55 92.23 0.79

Fig.3

Surface free energy and its components of asphalt mortars"

Fig.4

"

Fig.5

SEM micrographs of matrix asphalt and asphalt mortars"

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