沥青混合料油膜厚度计算方法

侯芸; 魏道新; 田波; 刘永祥

沥青混合料油膜厚度计算方法

1.
中国公路工程咨询集团有限公司, 北京 100097
2.
长安大学公路学院, 陕西西安 710064
3.
交通部公路科学研究院, 北京 100088
4.
内蒙古自治区交通厅, 内蒙古呼和浩特 011500

基金项目:

国家西部交通建设科技项目 200631800082

详细信息

作者简介:
侯芸(1975-), 男, 内蒙古呼和浩特人, 中国公路工程咨询集团有限公司高级工程师, 工学博士, 从事路面材料研究

中图分类号: U414.1
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- PDF下载量: 1257
- 被引次数: 0
出版历程
- 收稿日期: 2006-12-09
- 刊出日期: 2007-08-25

Calculation method of asphalt film thickness in mixture

1.
China Highway Engineering Consulting Co.Ltd., Beijing 100097, China
2.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
3.
Research Institute of Highway of Ministry of Communications, Beijing 100088, China
4.
Department of Communications of Inner Mongolia, Hohhot 011500, Inner Mongolia, China

More Information

Author Bio:
Hou Yun (1975-), male, EngD, senior engineer, +86-10-64852943, cwhhy@263.net

摘要

摘要: 为了精确计算沥青混合料油膜厚度, 考虑了矿粉粒度、沥青混合料压实程度和沥青比例的影响, 采用HORIBA-300型激光散射粒度分布分析仪对矿粉的粒度进行测量, 分析了矿粉粒度的尺寸范围, 提出了沥青隔离膜的概念, 建立了沥青油膜厚度计算模型。采用旋转压实仪成型沥青混凝土试件, 对比分析了沥青油膜的计算值与实际测量值。分析结果表明: 采用新的油膜公式反算的沥青用量范围为4.55%~4.85%, 采用传统方法反算的沥青用量范围为4.20%~5.20%, 而试验最佳沥青用量为4.70%, 显然新方法精度高。
- 路面工程 /
- 沥青混合料 /
- 油膜厚度 /
- 最佳沥青用量 /
- 矿粉粒度分布
Abstract: In order to accurately compute the asphalt film thickness of asphalt mixture, the particle-size of mineral, the compaction degree of asphalt mixture and asphalt ratio were considered, the particle-size of mineral was measured by using HORIBA-300 instrument, the particle-size distribution of mineral was analyzed, the concept of asphalt separation film was introduced, and a computation model of asphalt film thickness was put forward.The sample of asphalt mixture was molded by using rotary compaction instrument, and the computation values and measure values of asphalt film thickness were compared. Comparison result shows that the asphalt content range of asphalt mixture is from 4.55% to 4.85% with the new method, the range is from 4.20% to 5.20% with conventional method, measured optimal content is 4.70%, obviously, the computation precision of the proposed method is higher.
- pavement engineering /
- asphalt mixture /
- asphalt film thickness /
- optimum asphalt content /
- particle-size distribution of mineral

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图 1 油膜厚度传统计算模型

Figure 1. Traditional calculation model of asphalt film thickness

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图 2 新的油膜厚度计算模型

Figure 2. New calculation model of asphalt film thickness

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图 3 不同矿粉和消石灰的粒度分布

Figure 3. Particle-size distributions of different minerals and slaked lime

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图 4 油膜厚度对比

Figure 4. Comparison of asphalt film thicknesses

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图 5 油膜厚度与V的关系

Figure 5. Relationship between asphalt film thickness and V

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表 1 表面积因子对比

Table 1. Comparison of surface area factors

筛孔级数	筛孔尺寸D_i/mm	计算的表面积因子	规范的表面积因子
0	9.500	0.405	0.410
1	4.750	0.408	0.410
2	2.360	0.817	0.820
3	1.180	1.594	1.640
4	0.600	3.012	2.870
5	0.300	6.060	6.140
6	0.150	12.295	12.290
7	0.075	32.787	32.770
8	0.030

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表 2 设计级配

Table 2. Design gradation

筛孔尺寸/mm	19.000	16.000	13.200	9.500	4.750	2.360	1.180	0.600	0.300	0.150	0.075
通过率/%	100.0	98.8	88.6	72.0	48.7	32.3	22.9	17.6	12.8	8.6	5.4

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表 3 不同沥青用量下混合料的特性及油膜厚度

Table 3. Asphalt film thicknesses and properties of asphalt mixtures under different asphalt contents

混合料特性	沥青用量P_b/%
混合料特性	4.20	4.70	5.20	5.70
理论最大相对密度	2.619	2.598	2.578	2.557
沥青相对密度	1.030	1.030	1.030	1.030
毛体积相对密度	2.474	2.496	2.516	2.531
集料的毛体积相对密度	2.769	2.769	2.769	2.769
吸收沥青用量/%	0.53	0.53	0.53	0.53
矿料间隙率/%	14.4	14.1	13.9	13.8
传统油膜厚度/μm	6.94	7.93	8.93	9.94
推荐油膜厚度/μm	4.94	7.89	12.93	24.92
油膜厚度和沥青用量的回归方程	传统算法	T=1.996 9P_b-1.450 6
油膜厚度和沥青用量的回归方程	推荐算法	t=6.48P_b³-87.188 P_b²+396.51P_b-602.49

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