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为了讨论高模量剂对沥青及不同类型沥青混合料性能的改善作用,该文通过试验研究了高模量剂掺量对沥青粘温性能和高温性能,以及对AC-13和SMA-13两种混合料高温稳定性、低温抗裂性和水稳定性等路用性能的影响。结果表明:增大高模量剂掺量使沥青粘度和G*/sinδ大幅提高,当掺量大于6%时G*/sinδ提高不明显;加入高模量剂大幅提高了两种沥青混合料的高温稳定性,将两种沥青混合料的DS和G*/sinδ之间进行线性回归,其中AC-13的回归斜率值大于SMA-13,说明高模量剂对AC-13高温稳定性的改善效果大于SMA-13;在一定范围内增大高模量剂掺量能提高两种混合料的低温抗裂性和水稳定性,其中当掺量为4%和6%时,AC-13的低温抗裂性和水稳定性分别达到最佳值,而当掺量为6%时,SMA-13的低温抗裂性和水稳定性同时到达最佳值,当掺量相同时AC-13的低温抗裂性优于SMA-13。综合考虑,AC-13的最佳高模量剂掺量为4%,而SMA-13的最佳高模量剂掺量为6%。
In order to discuss the improvement effect of high modulus agent on the performance of asphalt and different types of asphalt mixtures, this paper studied the effects of high modulus agent on viscosity-temperature and high-temperature performance of asphalt, The mixture of high temperature stability, low temperature crack resistance and water stability and other road performance. The results show that when the content of high modulus agent is increased, the viscosity and G * / sin δ of asphalt are greatly increased, while the increase of G * / sinδ is not obvious when the dosage is greater than 6%. The addition of high modulus agent greatly improves the asphalt mixture , The linear regression between DS and G * / sinδ of the two asphalt mixtures was obtained. The regression slope of AC-13 was greater than that of SMA-13, indicating that the high modulus agent had a good linear relationship with the high temperature stability of AC-13 The improvement effect is greater than that of SMA-13. Increasing the content of high modulus agent within a certain range can improve the low temperature crack resistance and water stability of the two mixtures. When the content is 4% and 6%, AC-13 , Respectively. When the content is 6%, the low temperature crack resistance and water stability of SMA-13 reach the optimum value at the same time. When the content of AC-13 is the same, The low temperature crack resistance is better than SMA-13. Taken together, AC-13 has the best high-modulus dosage of 4%, while SMA-13 has the best high-modulus dosage of 6%.