沥青混合料劈裂强度影响因素数值模拟

doi:10.13229/j.cnki.jdxbgxb20180356

Abstract

Abstract:

This paper investigates the influence factors of the splitting strength of asphalt mixtures by means of numerical simulation. A micromechanical model for the splitting test of asphalt mixtures was established based on the three-dimensional (3D) Discrete Element Method (DEM) and the Cohesive Zone Model (CZM), and the splitting strength of asphalt mixtures with different aggregate gradations at different temperatures was simulated. Simulation results were verified by laboratory splitting tests. Results show that the splitting strength of asphalt mixtures can be simulated well using a micromechanical model based on CZM and 3D DEM. The aggregate gradation and temperature significantly affect the splitting strength of asphalt mixtures. At the same temperature, the splitting strength of asphalt mixtures increases with the nominal maximum aggregate size or when aggregate gradation becomes coarse. With the same nominal maximum aggregate size, the splitting strength of asphalt mixtures decreases with the increase in temperature.

Key words: road engineering, asphalt mixture, splitting strength, influence factor, cohesive zone model, discrete element method

CLC Number:

U414

Yong PENG,Hua GAO,Lei WAN,Gui-ying LIU. Numerical simulation of influence factors of splitting strength of asphalt mixtures[J].Journal of Jilin University(Engineering and Technology Edition), 2019, 49(5): 1521-1530.

Figures/Tables 7

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References 14

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级配	方孔筛/m
级配	31.5	26.5	19.0	16.0	13.2	9.5	4.75	2.36	1.18	0.6	0.3	0.15	0.075
AC13				100	95	70	48	36	24	18	12	8	4
AC16			100	97.5	82.5	68	52.5	41	29.5	22	16	11	6
AC20		100	97.5	82.5	71	62	48	37	27	21	15	10	6

工况		相体	材料参数
级配	温度/℃		抗拉强度/MPa	刚度/(GN·m^-1)		粘结强度/N
级配	温度/℃		抗拉强度/MPa	法向	切向	法向	切向
AC13	-10	集料	17.20	6.00	0.50	11.97	11.97
		胶浆	13.80	0.30	0.30	4.80	4.80
		接触	8.28	0.30	0.30	4.32	4.32
	20	集料	17.20	6.00	0.50	11.97	11.97
		胶浆	4.90	0.30	0.30	3.73	3.73
		接触	4.40	0.30	0.30	3.35	3.35
	35	集料	17.20	6.00	0.50	11.97	11.97
		胶浆	0.88	0.10	0.10	0.61	0.61
		接触	0.79	0.10	0.10	0.55	0.55
AC16	-10	集料	17.20	6.00	0.50	11.97	11.97
		胶浆	9.30	0.30	0.30	3.24	3.24
		接触	5.58	0.30	0.30	2.91	2.91
	20	集料	17.20	6.00	0.5.	11.97	11.97
		胶浆	4.41	0.30	0.30	2.96	2.96
		接触	3.96	0.30	0.30	2.67	2.67
	35	集料	17.20	6.00	0.50	11.97	11.97
		胶浆	1.65	0.10	0.10	0.41	0.41
		接触	1.48	0.10	0.10	0.37	0.37
AC20	-10	集料	17.20	6.00	0.50	11.97	11.97
		胶浆	9.99	0.30	0.30	3.48	3.48
		接触	4.49	0.30	0.30	3.14	3.14
	20	集料	17.20	6.00	0.50	11.97	11.97
		胶浆	4.70	0.30	0.30	3.38	3.38
		接触	4.23	0.30	0.30	3.04	3.04
	35	集料	17.20	6.00	0.50	11.97	11.97
		胶浆	1.50	0.10	0.10	0.34	0.34
		接触	1.35	0.10	0.10	0.31	0.31

温度/℃	级配	试件编号	旋转角度/（°）						平均值	总平均值
温度/℃	级配	试件编号	0	30	60	90	120	150	平均值	总平均值
-10	AC13	1#	3.12	3.25	3.17	3.27	3.22	3.22	3.21	3.35
	AC13	2#	3.33	3.45	3.59	3.51	3.59	3.48	3.49	3.35
	AC16	1#	3.35	3.51	3.49	3.46	3.59	3.51	3.49	3.42
	AC16	2#	3.25	3.29	3.47	3.43	3.34	3.31	3.35	3.42
	AC20	1#	3.16	3.68	3.83	3.80	3.57	3.78	3.64	3.63
	AC20	2#	3.56	3.57	3.82	3.56	3.77	3.40	3.61	3.63
20	AC13	1#	1.27	1.23	1.31	1.36	1.41	1.42	1.33	1.37
	AC13	2#	1.36	1.27	1.32	1.37	1.50	1.57	1.40	1.37
	AC16	1#	1.27	1.27	1.28	1.25	1.39	1.31	1.30	1.43
	AC16	2#	1.33	1.44	1.63	1.70	1.63	1.57	1.55	1.43
	AC20	1#	1.36	1.52	1.64	1.68	1.65	1.48	1.56	1.55
	AC20	2#	1.53	1.61	1.66	1.45	1.63	1.36	1.54	1.55
35	AC13	1#	0.58	0.57	0.61	0.63	0.62	0.66	0.61	0.59
	AC13	2#	0.50	0.59	0.59	0.61	0.60	0.63	0.58	0.59
	AC16	1#	0.55	0.58	0.59	0.60	0.69	0.65	0.61	0.64
	AC16	2#	0.62	0.65	0.70	0.71	0.69	0.67	0.67	0.64
	AC20	1#	0.77	0.78	0.90	0.94	0.93	0.83	0.86	0.83
	AC20	2#	0.80	0.77	0.88	0.78	0.81	0.73	0.80	0.83

温度/℃	级配	室内试验结果 /MPa				平均值/MPa	标准差/MPa	变异系数
温度/℃	级配	1#	2#	3#	4#	平均值/MPa	标准差/MPa	变异系数
-10	AC13	3.24	3.34	3.06	3.20	3.21	0.12	0.036
	AC16	3.46	3.32	3.6	3.47	3.46	0.11	0.033
	AC20	3.54	3.72	3.6	3.57	3.61	0.08	0.022
20	AC13	1.25	1.36	1.34	1.38	1.33	0.06	0.043
	AC16	1.37	1.45	1.33	1.41	1.39	0.05	0.037
	AC20	1.54	1.72	1.69	1.64	1.65	0.08	0.048
35	AC13	0.52	0.55	0.6	0.56	0.56	0.03	0.059
	AC16	0.63	-	0.62	0.63	0.63	0.006	0.010
	AC20	0.77	0.81	0.76	0.73	0.77	0.03	0.043

Numerical simulation of influence factors of splitting strength of asphalt mixtures

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