多孔沥青混合料的动态模量及其预估模型

doi:10.13229/j.cnki.jdxbgxb20210062

摘要/Abstract

摘要：

针对连续密级配沥青混合料AC-13、沥青玛蹄脂碎石SMA-13以及6种多孔沥青混合料（PAC-16、PAC-13a、PAC-13b、PAC-13c、PAC-10和PAC-5）开展了不同荷载频率和温度下的动态模量试验。试验结果显示：沥青混合料的动态模量随着加载频率的增大而增大，随着温度的升高而减小，变化幅度均呈逐渐减小趋势；相比空隙率为20.3%的PAC-13b，SBS沥青AC-13和SMA-13混合料的动态模量分别平均增加了196.8%和125.1%；空隙率相近的情况下，多孔沥青混合料的动态模量随着公称最大粒径的增大略有增大；公称最大粒径相同时，空隙率减小了1%，多孔沥青混合料的动态模量平均增加了约15.8%。基于时-温度等效原理，构建了移位因子与温度的关系表达式，利用Sigmoidal模型推导计算了混合料动态模量的主曲线；综合考虑了加载频率、试验温度、沥青黏度、混合料体积特性及集料级配等多个因素的影响，建立了适用于不同级配沥青混合料动态模量的预估模型，预测值与实测结果具有较高吻合度，说明该模型能够应用于沥青路面的结构设计和分析。

关键词: 土木工程, 多孔沥青混合料, 动态模量, 时-温等效, 主曲线, 预估模型

Abstract:

The dynamic modulus of dense gradation asphalt mixture AC-13， stone mastic asphalt SMA-13 and six kinds of porous asphalt concrete （PAC-16， PAC-13a， PAC-13b， PAC-13c， PAC-10 and PAC-5） were tested at different temperatures and different loading frequencies. The dynamic modulus of asphalt mixture are respectively increased with the loading frequency increasing and decreased with temperature increasing， and the changing amplitudes are both gradually reduced. Compared with PAC-13b with 20.3% void content， the average values of 196.8% and 125.1% increase in dynamic modulus for SBS asphalt AC-13 and SMA-13，respectively. For the porous asphalt mixtures with closely void content， a slightly reduction of dynamic modulus is observed for porous asphalt mixture with the increase of nominal maximum particle size. When the mixtures have same the nominal maximum particle size， the dynamic modulus of porous asphalt mixture is increased about 15.8% with the reduction of void content 1%. According to the time-temperature superposition principle， the expression of the shift factor is established to describe the effect of temperature， and the master curves of different asphalt mixtures are modeled， calculated and plotted by Sigmoidal function. Various factors， such as loading frequency， testing temperature， asphalt binder viscosity， volumetric properties of asphalt mixture and aggregate gradation， are considered to develop the predictive dynamic modulus equation for different asphalt mixture. The results show that the predicted values are in good agreement with the measured results， indicating that the predicted dynamic modulus model can be applied in structure design and analysis of asphalt pavement.

Key words: civil engineering, porous asphalt concrete, dynamic modulus, temperature-time dependent, master curve, prediction model

中图分类号:

U414

何兆益,李金凤,周文,官志桃. 多孔沥青混合料的动态模量及其预估模型[J]. 吉林大学学报(工学版), 2022, 52(6): 1375-1385.

Zhao-yi HE,Jin-feng LI,Wen ZHOU,Zhi-tao GUAN. Dynamic modulus of porous asphalt concrete and its prediction model[J]. Journal of Jilin University(Engineering and Technology Edition), 2022, 52(6): 1375-1385.

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级配类型	δ	α	β	γ	b	R²
70#沥青AC-13	1.804	2.853	-0.3547	-0.5321	0.3128	0.9980
SBS沥青AC-13	2.108	2.519	-0.2656	-0.5203	0.3034	0.9993
SMA-13	2.076	2.487	-0.1469	-0.5128	0.2936	0.9993
PAC-16	1.230	3.142	-0.3875	-0.4724	0.3260	0.9995
PAC-13a	1.299	3.197	-0.4899	-0.4093	0.3223	0.9994
PAC-13b	1.165	3.161	-0.4101	-0.4860	0.2916	0.9996
PAC-13c	1.075	3.083	-0.4273	-0.5056	0.2897	0.9998
PAC-10	1.157	3.019	-0.4005	-0.4705	0.3141	0.9992
PAC-5	1.156	3.085	-0.4384	-0.4453	0.3071	0.9994