基于振动成型AC-25沥青混合料力学性能及细观分析

doi:10.13229/j.cnki.jdxbgxb20200235

Abstract

Abstract:

In order to study the influences of Vertical Vibration Test Method (VTM) and Marshall compaction on the mechanical properties and void distribution of asphalt mixture, AC-25 asphalt mixture samples were prepared by VTM and the Marshall method respectively. The influences of molding method, vibration time and compaction time on the volume parameters and mechanical properties of AC-25 asphalt mixture were studied through VV, VMA, VFA, Marshall stability, compressive strength, split strength and shear strength. The correlation between the volume and performance indexes obtained by two indoor molding methods and the actual pavement was analyzed. Finally, the influences of molding mode, vibration time and compaction time on the grading of molding samples were analyzed by CT scanning technology. The study shows that the AC-25 samples formed by VTM have better mechanical properties and higher correlation with the real road surface. Moreover, the pore structure and mechanical properties of core samples show exponential distribution. The constitutive relationship between the pore structure and mechanical properties of AC-25 asphalt mixture can be described in the form of exponential function.

Key words: asphalt mixture, vertical vibration test method(VTM）, Marshall method, AC-25, mechanical properties, pavement core sample, CT scanning technology

CLC Number:

U414

Hai-bin WEI,Xiang-yan WANG,Fu-yu WANG,Yong ZHANG. Mechanical properties and micro analysis of AC-25 asphalt mixture based on vibration forming[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(4): 1269-1276.

Figures/Tables 15

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试验项目	实测值	规定值
针入度（25 °C，5 s，100 g/0.1 mm）	82	80~100
针入度指数PI	-0.6	-1.5~+1.0
软化点/°C	47.0	≥44
延度（15 °C）/cm	>100	≥100
密度/（g·cm^-3）	1.005	-
老化后质量变化/%	-0.082	≤±0.8
残留针入度比（25 °C）/%	90	≥57
残留延度（10 °C）/cm	15	≥8
60 °C动力黏度/（Pa·s）	150.4	≥140

技术指标	各档集料/mm
技术指标	19~26.5	13.2~19	9.5~13.2	4.75~9.5	2.36~4.75
压碎值/%	12.6	12.6	12.6	12.6	12.6
洛杉矶磨耗值/%	16.0	16.0	16.0	16.0	16.0
表观相对密度	2.985	2.970	2.959	2.902	2.898
吸水率/%	0.47	0.64	0.84	1.36	1.46
黏附性	5级	5级	5级	5级	5级
坚固性/%	3.0	3.0	3.0	3.0	3.0
针片状颗粒含量/%	4.1	4.2	5.2	5.6	-
＜0.075颗粒含量/%	0.6	0.4	0.3	0.4	0.4
软石含量/%	0.3	0.3	0.3	0.3	0.3

实验项目	实测值	实验项目	实测值
表观密度/（g·cm^-3）	2.805	砂当量/%	75
坚固性/%	2	棱角性/s	32.7

筛孔尺寸/mm	通过率/%	筛孔尺寸/mm	通过率/%
31.500	100	2.360	26.4
26.500	97.9	1.180	20.2
19.000	76.8	0.600	16.8
16.000	68	0.300	11.5
13.200	58.3	0.150	8.9
9.500	46.6	0.075	6.4
4.750	35.4

试件类型	ρ/（g?cm^-3）	VV/%	VMA/%	VFA/%
V_X	2.587	2.7	11.9	77.1
V_M	2.533	4.8	14.0	65.6
V_V	2.583	3.0	12.1	74.9
V_M/V_X	0.979	1.768	1.176	0.851
V_V/V_X	0.998	1.114	1.017	0.971

Mechanical properties and micro analysis of AC-25 asphalt mixture based on vibration forming

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