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UHPC-沥青面层黏层动态剪切性能
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Dynamic Shear Performances of Adhesive Layer between UHPC and Asphalt Surface
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    为探究超高性能轻型组合桥面 UHPC-沥青面层黏层材料动态力学性能,采用伺 服液压系统 UTM-30 对 UHPC-SMA 界面施加动态剪切荷载,通过 5 ℃、15 ℃、25 ℃、35 ℃、45 ℃、60 ℃六种温度和0.1 Hz、0.5 Hz、1 Hz、5 Hz、10 Hz、25 Hz六种加载频率下动态剪切试验,获 得热熔型改性环氧树脂 202、高黏高弹改性沥青 PG100两种典型黏层材料的动态剪切模量和 相位角的变化规律;基于时间-温度等效原理和Sigmoidal函数,采用最小二乘法拟合得到动态 模量主曲线和相位角主曲线. 试验研究表明:动态模量随着温度的升高而减小,随着频率的增 加而变大;而相位角却随着温度的升高而变大,随着频率的增加而减小;黏层材料具有黏弹性 材料动力响应特征. 在相同温度、相同频率下,树脂202的动态模量明显大于沥青PG100,其相 位角明显小于沥青 PG100,且随着温度的升高这种现象更明显;60 ℃时,树脂 202动态模量仍 大于 1.13 MPa,而沥青 PG100 仅为 0.15 MPa 左右;树脂 202 比沥青 PG100 具备更好的抗剪性 能. UHPC-沥青面层黏层最不利工况为高温与低频,与25 ℃、25 Hz(相当于120 km/h)相比,60 ℃、5 Hz(相当于 30 km/h)条件下,树脂 202、沥青 PG100 的动态剪切模量分别下降 34.9%、 88.8 %. 树脂 202、沥青 PG100动态模量主曲线拟合优度 R2 分别为 0.993、0.996,相位角主曲线 拟合优度R2 分别为0.978、0.989,回归方程的拟合度优良. 通过动态性能主曲线,不仅可以获得 高频率和长时间下的材料特征,同时也可以预测黏层材料的寿命和长期使用性能.

    Abstract:

    In order to explore the dynamic mechanical properties of the adhesive layer between UHPC and as? phalt surface for ultra-high performance lightweight composite bridge deck,the servo-hydraulic system UTM-30 was used for dynamic shear loading on the UHPC- SMA interface. On the conditions of temperature 5 ℃,15 ℃,25 ℃,35 ℃ ,45 ℃,60 ℃ and frequency 0.1 Hz,0.5 Hz,1 Hz,5 Hz,10 Hz,25 Hz,dynamic shear tests were car? ried out. The variation laws of dynamic shear modulus and phase angle were obtained for two typical adhesive materi? als,i. e. hot-melt modified epoxy 202 and high adhesion elastomer modified asphalt PG100. Based on the timetemperature equivalence principle and Sigmoidal function,the master curve of dynamic modulus and phase angle were obtained by using the least square method. The experimental results show that the dynamic modulus decreases with the increase of temperature,and increases with the increase of frequency. The phase angle increases with the in? crease of temperature,and decreases with the increase of frequency. The adhesive materials are of viscoelastic char? acteristics in dynamic response. At the same temperature and frequency,the dynamic modulus of resin 202 is signifi? cantly higher than that of asphalt PG100,its phase angle is significantly lower than that of asphalt PG100,and this phenomenon became more obvious with the increase in temperature. At 60 ℃,the dynamic modulus of resin 202 is still greater than 1.13 MPa,while the PG100 is only about 0.15 MPa. Resin 202 has better shear resistance than as? phalt PG100. The most unfavorable working conditions of the adhesive layer between UHPC and asphalt surface are high temperature and low frequency. Compared with 25 ℃ and 25 Hz(about 120 km/h),the dynamic shear modulus of resin 202 and asphalt PG100 is decreased by 34.9%,and 88.8 % respectively at 60 ℃ and 5 Hz(about 30 km/h). For the master curve of dynamic modulus,the goodness of fit R2 of resin 202 and PG100 are 0.993 and 0.996 respec? tively. For the master curve of phase angle,the goodness of fit R2 were 0.978 and 0.989 respectively. The regression equations have a good fitting degree. The master curves can not only find out the material characteristics at high fre? quency and for a long time,but also predict the life and long-term service performances of the adhesive layer material.

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李嘉 ,黄聪 ,陈思远 ,高俊甫 . UHPC-沥青面层黏层动态剪切性能[J].湖南大学学报:自然科学版,2022,49(5):82~91

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  • 在线发布日期: 2022-06-06
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