复合载荷下沥青路面高密实摊铺特性

贾洁; 朱建国; 刘洪海; 万一品

doi:10.19818/j.cnki.1671-1637.2023.06.006

复合载荷下沥青路面高密实摊铺特性

doi: 10.19818/j.cnki.1671-1637.2023.06.006

长安大学道路施工技术与装备教育部重点实验室，陕西西安 710064

基金项目:

国家自然科学基金项目 51908057

陕西省自然科学基础研究计划项目 2022JQ-572

详细信息

作者简介:
贾洁(1990-)，女，陕西韩城人，长安大学讲师，工学博士，从事高密实摊铺与智能压实技术研究

通讯作者:
万一品(1988-)，男，河南邓州人，长安大学副教授，工学博士

中图分类号: U416.2
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出版历程
- 收稿日期: 2023-05-22
- 刊出日期: 2023-12-25

High-compactness paving characteristics of asphalt pavement under combined load

Key Laboratory of Road Construction Technology and Equipment of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Natural Science Foundation of China 51908057

Natural Science Basic Research Project of Shaanxi Province 2022JQ-572

More Information

Author Bio:
JIA Jie(1990-), female, assistant professor, PhD, jiajie@chd.edu.cn

WAN Yi-pin(1988-), male, associate professor, PhD, wyipin@chd.edu.cn

摘要

摘要: 为提高沥青路面的初始密实度，获得摊铺机熨平板作业后铺层混合料的高密实特性，考虑振捣机构和振动机构共同作用的影响，针对熨平板动力学特性及其对铺层混合料的压实作用，建立了熨平板压实系统动力学模型；基于不同振捣频率和振动频率下的熨平板位移变化，剖析了铺层混合料密实度与熨平板动态响应的关系；采用正交试验方法进行了仿真设计，以熨平板动态响应的平均位移峰值为密实度评价指标，分析了振捣机构和振动机构共同作用下混合料的密实效果；进行了熨平板对混合料的高密实摊铺效果试验，验证了只有振捣机构作用时的路面密实度和加入振动机构作用后路面密实度增量随振捣频率的变化，并对密实度增量和只有振捣机构作用时的路面密实度进行了相关性分析。研究结果表明：振捣频率和振动频率差值增大时，振捣作用对熨平板位移峰值的影响不显著，振动压实可补偿振捣压实较弱位置的密实度，但存在压实极限；振捣频率为10~18 Hz，且振动频率匹配在30~40 Hz范围内时，振捣与振动的复合压实达到最佳状态，可提高混合料的密实度，并可避免高密实摊铺作业时熨平板对混合料的过压实；振动频率分别匹配在高密实频率范围以内和以外时，混合料密实度增量相差2%~6%。
- 路面工程 /
- 沥青路面 /
- 高密实摊铺 /
- 复合载荷 /
- 位移峰值 /
- 振动压实
Abstract: To improve the initial compactness of the asphalt pavement and obtain the high-compactness characteristics of the paving mixture after the screed of paver operation, the effect of the combined load generated by the tamper and vibrator was considered. In view of the screed's dynamics characteristics and its compaction effect on the paving mixture, the dynamics model of the screed compaction system was established. Based on the displacement changes in the screed under different frequencies of tamper and vibrator, the relationship between the compactness of the paving mixture and the dynamic response of the screed was analyzed. The simulation design was carried out by the orthogonal test method. Taking the average displacement peak of the dynamic response of screed as the evaluation index of compactness, the compaction effect of the mixture under the combined load generated by the tamper and vibrator was analyzed. A test was carried out to observe the high-compactness paving effect of the screed on the mixture. The compactness of the pavement under the action of only the tamper and the variations in the paving compactness increment with the tamper frequency after the addition of the vibrator was verified, and the correlation between the compactness increment and the paving compactness under only the tamper load was analyzed. Research results show that when the difference between the vibrator frequency and the tamper frequency increases, the impact of the tamper load on the displacement peak of the screed is not significant. The vibration compaction can compensate for the compactness of the weak compaction position of the tamper, but there is a compaction limit. When the tamper frequency is 10-18 Hz, and the corresponding vibrator frequency is 30-40 Hz, the combined compaction of tamper and vibrator achieves the best state, which can improve the compactness of the mixture and avoid the overcompaction of the mixture by the screed during the high-compactness paving operation. When the vibrator frequency is within or exceeds the high-compactness frequency range, the compactness increment of the mixture varies by 2%-6%.
- pavement engineering /
- asphalt pavement /
- high-compactness paving /
- combined load /
- displacement peak /
- vibration compaction

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图 1 摊铺机压实机构动力学模型

Figure 1. Dynamics model of paver compaction mechanism

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图 2 AC-16沥青混合料合成级配

Figure 2. Synthetic gradation of AC-16 asphalt mixture

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图 3 振捣频率变化时熨平板位移曲线

Figure 3. Curves of screed displacement when tamper frequency changes

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图 4 振动频率变化时熨平板位移曲线

Figure 4. Curves of screed displacement when vibrator frequency changes

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图 5 压实机构频率与熨平板位移峰值的关系

Figure 5. Relationships between compaction mechanism frequencies and displacement peak of screed

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图 6 压实机构频率与熨平板平均位移峰值的关系

Figure 6. Relationship between compaction mechanism frequency and average displacement peak of screed

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图 7 路面结构

Figure 7. Pavement structure

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图 8 振动压实特性试验流程

Figure 8. Test process of vibration compaction characteristics

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图 9 现场试验摊铺过程

Figure 9. Field test paving process

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图 10 无核密度仪标定

Figure 10. Calibration of non-nuclear density gauge

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图 11 密实度与振捣频率拟合曲线

Figure 11. Fitting curves between compactness and tamper frequency

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图 12 不同振动频率时密实度增量与振捣频率拟合曲线

Figure 12. Fitting curves between compactness increment and tamper frequency at different vibrator frequencies

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图 13 高密实频率范围内密实度计算结果

Figure 13. Calculation results of compactness within high-compactness frequency range

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表 1 沥青性能试验结果

Table 1. Asphalt performance test results

试验项目		技术指标	实测值
针入度(25 ℃，100 g，5 s)/(0.1 mm)		60~80	67
针入度指数		≥-0.40	1.65
延度(5 ℃，5 cm·min^-1)/cm		≥30	49
软化点/℃		≥55	73
闪点/℃		≥230	281
旋转薄膜烘箱试验(Rolling Thin Film Oven Test, RTFOT) 后残留物	质量变化/%	[-1.0, 1.0]	-0.4
	残留针入度比(25 ℃)/%	≥60.0	68.6
	残留延度(5 ℃)/cm	≥20	26

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表 2 熨平板模型计算参数

Table 2. Calculation parameters of screed model

参数	m/kg	m_d/kg	M/kg	K/(N·m^-1)	C/(N·s·m^-1)
数值	500	500	8 000	2.51×10⁷	8.2×10⁴

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表 3 不同频率组合下的设计方案

Table 3. Design schemes under different frequency combinations

方案编号	1	2	3	4	5	6	7	8
振动频率/Hz	24	30	36	40	24	30	36	40
振捣频率/Hz	10	10	10	10	15	15	15	15

方案编号	9	10	11	12	13	14	15	16
振动频率/Hz	24	30	36	40	24	30	36	40
振捣频率/Hz	18	18	18	18	23	23	23	23

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表 4 平均位移峰值分析结果

Table 4. Analysis results of average displacement peak

水平	振动频率/ Hz	平均位移峰值/ mm	振捣频率/ Hz	平均位移峰值/ mm
1	24	0.292	10	0.268
2	30	0.362	15	0.340
3	36	0.337	18	0.355
4	40	0.333	23	0.362

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表 5 试验方案

Table 5. Test schemes %

振捣频率百分比	振动频率百分比
0	10	20	30	40	50	60
10	10	20	30	40	50	60
20	10	20	30	40	50	60
30	10	20	30	40	50	60	65
40	10	20	30	40	50	60
50	10	20	30	40	50	60	65
60	10	20	30	40	50	60

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表 6 密实度增量与振捣作用下路面密实度的相关性分析结果

Table 6. Correlation analysis results of compactness increment and pavement compactness under action of tamper

振动频率百分比/%	不同振捣频率百分比(%)下的密实度增量/%						相关系数
振动频率百分比/%	10	20	30	40	50	60	相关系数
10	3.49	3.81	7.14	8.14	9.12	6.47	-0.742
20	3.31	6.86	7.26	11.18	9.97	6.49	-0.679
30	6.04	6.52	9.05	8.57	10.86	10.84	-0.462
40	6.72	7.01	8.89	9.65	10.92	9.20	-0.688
50	5.59	6.79	10.21	10.94	13.48	10.58	-0.643
60	5.40	6.06	9.74	11.51	12.40	9.46	-0.724

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