纤维沥青混凝土的粘弹性分析

郭乃胜; 赵颖华

纤维沥青混凝土的粘弹性分析

大连海事大学道路与桥梁工程研究所, 辽宁大连 116026

基金项目:

辽宁省自然科学基金项目 20042112

大连市科技计划基金项目 2004B3SFl80

详细信息

作者简介:
郭乃胜(1978-), 男, 辽宁鞍山人, 大连海事大学讲师, 工学博士, 从事路面破坏分析与寿命评价研究

中图分类号: U414
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- 被引次数: 0
出版历程
- 收稿日期: 2007-04-12
- 刊出日期: 2007-10-25

Viscoelastic performance analysis of fiber reinforced asphalt concrete

Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian 116026, Liaoning, China

More Information

Author Bio:
Guo Nai-sheng(1978-), male, EngD, lecturer, +86—411—81707622, gnsdy@163.com

摘要

摘要: 为了研究纤维沥青混凝土的粘弹性能, 制作5种20个聚酯纤维沥青混凝土圆柱试件, 在MTS810材料试验机上进行单轴静压蠕变试验, 试验温度为45℃。根据粘弹性力学理论, 采用“四单元五参数”模型(修正的Bugers模型)模拟纤维沥青混凝土的粘弹性能, 其参数值由试验数据的数值拟合获得, 提出了计入纤维掺量的“四单元五参数”粘弹性本构模型。应用该模型模拟了试验的加载过程, 分析了纤维掺量对沥青混凝土粘弹性的影响。结果表明: 不同纤维掺量下沥青混凝土的蠕变变形增量不同, 但变化规律与普通沥青混凝土是一致的; 粘弹性模型计算的纤维最佳平均用量为0.18%, 试验结果为0.20%, 两者基本接近, 因此, 本研究提出的粘弹性模型可作为理论研究和材料设计的参考。
- 路面工程 /
- 纤维沥青混凝土 /
- 纤维掺量 /
- 蠕变试验 /
- 粘弹性
Abstract: In order to investigate the viscoelastic performance of fiber reinforced asphalt concrete, five kinds of cylinder samples were produced, and four samples for each cylinder sample were tested on MTS810 by using uniaxial static compression creep test at 45 ℃.The viscoelastic performance was simulated by using four-unit five-parameter model, its parameters were obtained from the data of the test, and a four-unit five-parameter viscoelastic constitutive model with fiber content was set up.The loading process of the test was simulated by using the new model, and the influence of fiber content on the performance was analyzed.Analysis result shows that the creep response of fiber reinforced asphalt concrete is similar to that of conventional asphalt concrete except the difference of creep deformation, the computation optimal average value of fiber content is 0.18%, its test optimal value is 0.20%, the difference between the values is less, so the new model may be applied in the reference of theory research and material design.
- pavement engineering /
- fiber reinforced asphalt concrete /
- fiber content /
- creep test /
- viscoelastic performance

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图 1 蠕变曲线

Figure 1. Creep curves

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图 2 蠕变结果对比

Figure 2. Comparison of creep results

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图 3 不同加载时间下应变率曲线

Figure 3. Strain rate curves with different loading times

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图 4 不同应力水平下应变率曲线

Figure 4. Strain rate curves with different loading stresses

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表 1 模型参数

Table 1. Model parameters

纤维掺量/%	模型参数					相关系数
纤维掺量/%	E₁/MPa	E₂/MPa	η₂/(GPa·s)	A/10⁵ MPa	B/10^-4 MPa	相关系数
0	180.56	55.79	4.29	1.28	6.3	0.991
0.15	189.01	65.45	4.34	0.98	9.4	0.992
0.20	210.03	63.28	3.85	1.14	11.1	0.984
0.25	193.95	48.27	2.75	0.97	9.6	0.989
0.30	129.75	42.87	2.23	1.03	8.1	0.986

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表 2 $\dot{ε}_{1} (t, \bar{c})$ 的最小值及其对应的 $\bar{c}$ 值

Table 2. Minimum $o f \dot{ε}_{1} (t, \bar{c})$ and corresponding $\bar{c}$

计算结果	时间/s
计算结果	1000	1200	1800	2700	3600
$\dot{ε}_{1} (t, \bar{c}) / 10^{- 7}$	3.573	2.909	1.574	0.622	0.246
$\bar{c}$	0.175	0.173	0.163	0.181	0.177

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