摘要
为了研究温度、频率、玄武岩纤维掺量对大空隙沥青混合料动态模量和相位角的影响,采用单轴压缩动态模量实验研究玄武岩纤维掺量分别为0%、0.1%、0.3%的大空隙沥青混合料在5种温度及6种频率下的动态模量值及相位角。结果表明,大空隙沥青混合料的动态模量值随温度升高而降低,随荷载频率增加而增加。大空隙沥青混合料相位角在每个频率下都随温度的增加先增大后减小。在高温条件下,随着荷载频率的增加,相位角也随之变大;温度低于35℃时,随着荷载频率的增加,相位角随之减小。相比未掺加玄武岩纤维的大空隙沥青混合料,纤维掺量为0.1%、0.3%时,在低温(-10℃)下,其动态模量值更小,相位角更大,具有更好的低温抗裂性能;在高温(50℃)时,动态模量值更大,相位角更小,具有更好的高温稳定性。特别是纤维掺量为0.3%时,低温抗裂性和高温稳定性更好。结合时温等效原理,通过Origin软件,采用西格摩得模型对实验结果进行非线性拟合,拟合结果表明掺加0.3%玄武岩纤维可以更好地提高大空隙沥青混合料的高温稳定性和低温抗裂性,为路面结构设计提供有价值的参考依据。
In order to study the effect of temperature,frequency and basalt fiber content on the dynamic modulus and phase angle of large-void asphalt mixture,the uniaxial compression dynamic modulus experiment was used to test the dynamic modulus and phase angle of the large-void asphalt mixture of basalt fiber content of 0%,0.1%and 0.3%at five different temperatures and six different frequencies respectively.The results show that the dynamic modulus of asphalt mixture decreases with the increasing of temperature and increases with the increasing of the load frequency.The phase angle of the large-void asphalt mixture increases first and then decreases with the increasing of temperature at each frequency.At high temperatures,the phase angle increases with the increasing of frequency,when the temperature is below 35℃,the phase angle becomes smaller with the increasing of the loading frequency.Compared with the large-void asphalt mixture without basalt fiber,when the fiber content are 0.1%and 0.3%,the dynamic modulus value is smaller and the phase angle is larger at low temperature(-10℃),it has better low temperature crack resistance.The dynamic modulus value is larger and the phase angle is smaller at high temperature(50℃),it has better high temperature stability.Especially when the fiber content is 0.3%,the low temperature crack resistance and high temperature stability are better.In combination with the time-temperature equivalence principle,Origin software and sigmod model are used for nonlinear fitting of experimental results,the fitting results show that the addition of 0.3%basalt fiber can improve the high temperature stability and low temperature crack resistance of the large-void asphalt mixture,providing valuable reference for pavement structure design.
作者
赵小崇
高淑玲
何世钦
ZHAO Xiaochong;GAO Shuling;HE Shiqin(School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;School of Civil Engineering, North China University of Technology, Beijing 100144, China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第4期1331-1342,共12页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51108151)。
