摘要
为研究沥青路面在车辆荷载作用下的层间黏结特性,采用自主研发的能施加水平推力的切-拉拔装置进行层间黏结试验。通过正交试验,测试了不同温度、水平推力和黏层油用量等条件下沥青混合料复合试件的层间黏结强度,分析了各因素对黏结强度的影响规律,并通过敏感性分析确定了各因素的影响程度;采用多元非线性回归方法和SPSS统计软件,分析了层间黏结强度与温度、水平推力和黏层油用量的关系,构建了低温、常温、高温3种温度下沥青路面在切-拉拔力综合作用下的层间黏结模型,并验证了该模型的可行性。研究结果表明:水平推力削弱了层间黏结整体性能,层间黏结强度降低,当黏层油用量为0.8kg/m2时,水平推力由0 MPa增至0.2 MPa,其黏结强度降至原有的1/3;随着水平推力的增加,层间黏结强度随黏层油用量的增加呈先增后减趋势,但影响程度逐渐减弱,最大黏结强度所对应的合理黏层油用量为0.8~1.0kg/m2;随着温度的升高,层间黏结强度迅速降低,温度越高,水平推力对层间黏结强度的影响幅度越大,当温度为50℃、水平推力为0.2MPa时,层间黏结强度降为0MPa;不同温度区间层间黏结强度下降趋势不同,低温最快、常温变缓、高温最慢;各因素对层间黏结强度影响大小的顺序为温度、水平推力、黏层油用量。
To research the interface bond characteristics of asphalt pavement under traffic loading, this paper carried out the test to estimate bonding strength between asphalt layers via direct tension test （DTT） which can apply horizontal shear load. By the orthogonal test, this paper not only tested the interface bonding strength of asphalt mixture composite specimen under different temperature, shear load and tack coat application rate, but also analyzed the influence law of each factor on the bonding strength, and the influence degree of each factor was determined bysensitivity analysis. What＇s more, the multiple nonlinear regression method and SPSS statistical software were used to analyze the relationship between interface bonding strength and temperature, shear load and tack coat application rate. And the prediction models describing interface bonding strength under the combined effect of tension and shear stress at three different temperature levels including low temperature, middle temperature and high temperature were proposed and their feasibility was demonstrated. The results show that the interface bonding strength reduces once the shear load be applied, and the bonding strength decreases to 1/3 of the original value when the tack coat application rate is 0.8 kg/m2 and the horizontal shear load increases from 0 MPa to 0.2 MPa. With the increase of shear load, the interface bonding strength increases and then decreases with the increase of tack coat dosage, but the degree of influence is gradually weakened. The bonding strength reaches the maximum value when the tack coat dosage is within the range of 0.8 to 1.0 kg/m2. Moreover, the interface bonding strength decreases sharply with the increase of temperature, and the higher the temperature, the greater the effect of horizontal shear load on the inter{ace bonding strength. Once the temperature reaches 50 ℃ and the shear load is 0.2 MPa, the interface bonding strength decreases to the value of 0 MPa. The decreasing tendency of the interlayer bonding str
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第3期16-23,共8页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(51378438)
中央高校基本科研业务费专项资金项目(SWJTU12ZT05)
关键词
道路工程
沥青路面
拉拔试验
层间界面
黏结强度
水平推力
road engineering
asphalt pavement
direct tension test （DTT）
interface
bondingstrength
horizontal loading
