基于灰色关联度的矿料对沥青混合料力学性能的影响分析

doi:10.13229/j.cnki.jdxbgxb20200350

摘要/Abstract

摘要：

为分析矿料含量对沥青混合料力学性能的影响，利用旋转压实方法制备了4种级配沥青混合料，并通过劈裂试验、压缩试验以及蠕变试验研究了4种级配沥青混合料的低温抗开裂能力、常温抗拉/压破坏能力以及蠕变性能。随后，利用卷积积分和Laplace变换推导了4种沥青混合料的松弛模量随加载时间的变化趋势，并结合Burgers模型和二阶广义Maxwell模型对蠕变和松弛特性进行了拟合分析。最后，根据灰色关联度算法计算了矿料含量与沥青混合料力学性能的关联度，分析了矿料含量对混合料力学性能的影响。结果表明：沥青混合料的低温抗开裂、常温抗拉/压性能主要与0.15~0.3 mm和1.18~2.36 mm两档矿料的含量具有较高的相关度；而常温抗蠕变能力主要受0.6~1.18 mm和2.36~4.75 mm两档矿料的影响；温度升高后，抗蠕变能力受矿料含量变化的影响程度增加；松弛强度受细集料含量影响较大，而松弛时间主要受较大粒径矿料含量的影响。

关键词: 道路工程, 沥青混合料, 级配, 灰色关联度, 力学性能, 蠕变, 松弛

Abstract:

To analyze the influence of the content of aggregate on the mechanical properties of asphalt mixture， four grades of asphalt mixtures are prepared by Superpave gyratory compactor. The cracking resistance， compression resistance， and creep properties of the four asphalt mixtures are respectively studied by splitting tests， compression tests， and creep tests at different temperatures. Then， the variations of relaxation moduli of four grades of asphalt mixtures with the loading time are deduced by convolution integral and Laplace transform， and the creep and relaxation characteristics of four grades of asphalt mixtures are fitted and analyzed by Burgers model and second-order extensive Maxwell model. Finally， according to the grey correlation degree algorithm， the correlation degree between aggregate content and mechanical properties of asphalt mixtures is calculated， and the influence of aggregate content on the mechanical properties of asphalt mixtures is analyzed. The results show that the low-temperature cracking resistance， room temperature tensile and compressive properties of asphalt mixtures are highly related to the content of aggregate with 0.15~0.3 mm and 1.18~2.36 mm， while the creep resistance at room temperature is mainly affected by aggregate with 0.6~1.18 mm and 2.36~4.75 mm. As the temperature increases， the effect of aggregate content on the creep resistance increases. The relaxation strength is greatly affected by the fine aggregate， while the relaxation time is mainly affected by the larger aggregate.

Key words: road engineering, asphalt mixture, gradation, grey correlation degree, mechanical properties, creep, relaxation

中图分类号:

U414

程永春,李赫,李立顶,王海涛,白云硕,柴潮. 基于灰色关联度的矿料对沥青混合料力学性能的影响分析[J]. 吉林大学学报(工学版), 2021, 51(3): 925-935.

Yong-chun CHENG,He LI,Li-ding LI,Hai-tao WANG,Yun-shuo BAI,Chao CHAI. Analysis of mechanical properties of asphalt mixture affected by aggregate based on grey relational degree[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(3): 925-935.

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技术指标		单位	规范值	试验值
针入度(25 ℃、5 s、100 g)		0.1 mm	60~80	67.9
5 ℃延度(5 cm/min)		cm	≥20	26.8
软化点(环球法)		℃	≥65	76.4
25 ℃弹性恢复		%	≥85	90.3
薄膜烘箱老化	质量变化	%	≤±0.8	0.26
	残留针入度比(25 ℃)	%	≥60	81.5
	残留延度(5 ℃)	cm	≥10	14.4

模型参数	20 ℃蠕变				50 ℃蠕变
模型参数	AC	SUP	SMA	OGFC	AC	SUP	SMA	OGFC
E₁	94.708	7.567	6.566	4.091	1.540	2.251	0.808	0.444
E₂	5.962	4.524	2.295	1.433	2.585	3.955	1.475	0.569
η₁	24 958.4	21 216.2	13 287.3	7 590.1	16 803.6	34 420.1	11 127.0	42 53.6
η₂	731.9	425.6	154.3	158.1	239.0	358.7	113.9	27.9
R²	0.994 6	0.986 3	0.990 2	0.991 3	0.971 4	0.962 7	0.974 6	0.964 8

模型参数	20 ℃松弛				50 ℃松弛
模型参数	AC	SUP	SMA	OGFC	AC	SUP	SMA	OGFC
G₁	4.688	2.607	1.669	0.994	0.929	1.393	0.503	0.237
G₂	12.990	2.845	7.528	1.885	0.431	0.621	0.212	0.128
ρ₁	6550.2	9940.4	8247.5	8579.3	23276.4	32292.2	31212.3	27070.6
ρ₂	81.659	100.086	8.408	57.866	143.052	129.117	125.514	68.012
R²	0.992	0.949	0.888	0.928	0.973	0.971	0.967	0.956