高温和重载对DCLR改性沥青混合料抗变形能力的影响

季节; 陈磊; 索智; 许鹰; 韩彦龙

doi:10.19818/j.cnki.1671-1637.2019.01.001

高温和重载对DCLR改性沥青混合料抗变形能力的影响

doi: 10.19818/j.cnki.1671-1637.2019.01.001

季节^{1, 2,},
陈磊¹,
索智^{1, 2},
许鹰^{1, 2},
韩彦龙³

1.
北京建筑大学土木与交通工程学院，北京 100044
2.
北京未来城市设计高精尖创新中心，北京 100044
3.
长安大学公路学院，陕西西安 710064

基金项目:

国家自然科学基金项目 51478028

国家自然科学基金项目 51778038

北京市教育委员会市属高校创新能力提升计划项目 PXM2015-014210-000003

长江学者和创新团队发展计划项目 IRT_17R06

详细信息

作者简介:
季节(1972-), 女, 河南信阳人, 北京建筑大学教授, 工学博士, 从事道路材料研究

中图分类号: U416
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- 被引次数: 0
出版历程
- 收稿日期: 2018-08-25
- 刊出日期: 2019-02-25

Effect of high temperature and heavy load on deformation resistance of DCLR modified asphalt mixture

JI Jie^{1, 2
,},
CHEN Lei¹,
SUO Zhi^{1, 2},
XU Ying^{1, 2},
HAN Yan-long³

1.
School of Civil Engineering and Transportation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2.
Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
3.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

More Information

Author Bio:
JI Jie(1972-), female, professor, PhD, jijie@bucea.edu.cn

摘要

摘要: 为了评价煤直接液化残渣(DCLR) 和复合DCLR改性沥青混合料在高温和重载下的抗变形能力, 对级配为AC-20的2种沥青混合料进行多温度(50℃、60℃、70℃)、多荷载(0.7、0.8、0.9、1.0 MPa) 条件下的三轴重复荷载试验, 并对试验数据进行非线性拟合, 提出了能够在高温和重载条件下评价2种沥青混合料抗变形能力的指标, 并利用方差分析法研究了温度和荷载对沥青混合料抗变形能力的显著性影响。研究结果表明: 2种沥青混合料的永久变形随温度和荷载的增大而增大, 流动数、非线性拟合指数分别与温度和荷载呈负相关与正相关, 说明流动数和非线性拟合指数均能反映沥青混合料的抗变形能力, 但2种沥青混合料的流动数的三维曲面在温度为65℃~70℃和荷载为1.0 MPa处有交叉, 说明流动数在高温和重载条件下不能有效区分DCLR和复合DCLR改性沥青混合料的抗变形能力; 在0.05显著性水平下, 2种沥青混合料的抗变形能力对温度的敏感性均高于荷载, 因此, 温度为影响2种沥青混合料抗变形能力的主要因素, 荷载为次要因素; 温度和荷载的非线性拟合指数、流动数分别在0.013和0.113显著性水平下对2种沥青混合料的抗变形能力有显著性影响, 因此, 在试验温度和荷载范围内非线性拟合指数比流动数更适合作为评价DCLR与复合DCLR改性沥青混合料抗变形能力的指标。
- 路面工程 /
- DCLR改性沥青混合料 /
- 复合DCLR改性沥青混合料 /
- 抗变形能力 /
- 三轴重复荷载试验 /
- 方差分析 /
- 高温 /
- 重载
Abstract: To evaluate the deformation resistance of coal direct liquefaction residue (DCLR) modified asphalt mixture and compound DCLR modified asphalt mixture under high temperature and heavy load, the tri-axial repeated load test was carried out on two asphalt mixtures with the gradation of AC-20 under multi-temperatures (50 ℃, 60 ℃, 70 ℃) and multi-loads (0.7, 0.8, 0.9, 1.0 MPa) conditions, and the test data were nonlinearly fitted. An index for evaluating the deformation resistances of the two asphalt mixtures under high temperature and heavy load was proposed, and the variance analysis method was used to investigate the significant influences of temperature and load on the deformation resistance of asphalt mixture. Research result shows that the permanent deformations of two asphalt mixtures increase as temperature and load increase. The flow number and nonlinear fitting index have negative and positive correlation with temperature and load, respectively, indicating that both nonlinear fitting index and flow number can reflect the deformation resistance of asphalt mixture. However, the flow number three-dimensional surfaces of the two asphalt mixtures have intersects when temperature varies from 65 ℃ to 70 ℃ and load is 1.0 MPa, demonstrating that flow number cannot effectively distinguish the deformation resistances of DCLR modified asphalt mixture and compound DCLR modified asphalt mixture under high temperature and heavy load. The sensitivity of two asphalt mixtures to temperature is higher than to load at a significant level of 0.05. Therefore, temperature is the main factor that affects the deformation resistances of the two asphalt mixtures, and load is the secondary factor. The nonlinear fitting index and flow number of temperature and load have significant influences on the deformation resistances of two asphalt mixtures when the significant levels are 0.013 and 0.113, respectively, reporting that the nonlinear fitting index is more suitable than the flow number for evaluating the deformation resistances of DCLR modified asphalt mixture and compound DCLR modified asphalt mixture within test temperature and load conditions.
- pavement engineering /
- DCLR modified asphalt mixture /
- compound DCLR modified asphalt mixture /
- deformation resistance /
- tri-axial repeated load test /
- variance analysis /
- high temperature /
- heavy load

HTML全文

图 1 DCLR改性沥青混合料实测永久变形和拟合曲线

Figure 1. Measured permanent deformations and fitting curves of DCLR modified asphalt mixture

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图 2 复合DCLR改性沥青混合料实测永久变形和拟合曲线

Figure 2. Measured permanent deformations and fitting curves of compound DCLR modified asphalt mixture

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图 3 不同温度下2种沥青混合料的非线性拟合参数A随荷载的变化

Figure 3. Changes of nonlinear fitting parameter A of two asphalt mixtures with load under different temperatures

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图 4 不同温度下2种沥青混合料的非线性拟合指数B随荷载的变化

Figure 4. Changes of nonlinear fitting index B of two asphalt mixtures with load under different temperatures

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图 5 不同温度下2种沥青混合料的流动数F_N随荷载的变化

Figure 5. Changes of flow number F_N of two asphalt mixtures with load under different temperatures

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图 6 两种沥青混合料的B、F_N与温度和荷载的三维曲面

Figure 6. Three-dimensional surfaces of B, F_N of two asphalt mixtures with temperature and load

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图 7 不同荷载下2种沥青混合料的非线性拟合指数B随温度的变化

Figure 7. Changes of nonlinear fitting index B of two asphalt mixtures with temperature under different loads

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表 1 三种沥青的物理性能

Table 1. Physical properties of three asphalts

指标		SK-90沥青	DCLR改性沥青	复合DCLR改性沥青
25 ℃针入度/0.1 mm		81.1	35.1	33.4
软化点/℃		51.0	59.2	77.5
10 ℃延度/cm		51.8	5.7	12.2
旋转薄膜烘箱老化后残留物	质量变化/%	0.1	0.2	-0.1
	针入度比/%	64.1	69.3	79.5
	10 ℃残留延度/cm	8.1	4.2	9.7

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表 2 两种沥青混合料的B的方差分析结果

Table 2. Variance analysis Results of B of two asphalt mixtures

混合料类型	因素	平方和	均方根	F值	P值
DCLR改性沥青混合料	温度/℃	0.005	0.003	69.824	0.000
DCLR改性沥青混合料	荷载/MPa	0.003	0.001	22.009	0.001
复合DCLR改性沥青混合料	温度/℃	0.008	0.004	120.177	0.000
复合DCLR改性沥青混合料	荷载/MPa	0.001	0.000	8.893	0.013

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表 3 两种沥青混合料的F_N的方差分析结果

Table 3. Tab. 3 Variance analysis results of F_Nof two asphalt mixtures

混合料类型	因素	平方和	均方根	F值	P值
DCLR改性沥青混合料	温度/℃	29 975 400	14 987 700	179.777	0.000
DCLR改性沥青混合料	荷载/MPa	433 464	216 732	3.198	0.113
复合DCLR改性沥青混合料	温度/℃	2 661 350	887 117	10.641	0.008
复合DCLR改性沥青混合料	荷载/MPa	1 727 740	575 912	8.498	0.014

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