基于黏弹性理论的多聚磷酸改性沥青低温性能

发布时间：2018-03-15 00:16

  本文选题：多聚磷酸改性沥青　切入点：黏弹性　出处：《复合材料学报》2017年02期 　论文类型：期刊论文

【摘要】：基于黏弹性理论,对不同质量分数(0.5wt%,1.0wt%,1.5wt%,2.0wt%)的多聚磷酸改性沥青及基质沥青进行低温弯曲流变试验(BBR),结合Burgers模型对低温弯曲梁流变试验得到的蠕变数据进行非线性拟合,利用Burgers模型的四个参数(E_1、η_1、E_2、η_2分别是Maxwell和Kelvin模型中弹性模量和黏性系数)确定出低温性能指标,对多聚磷酸改性沥青低温性能进行分析。结果表明:多聚磷酸的添加使沥青中的黏性和弹性都得到了一定的改善,沥青中松弛时间减少,储存能减少,耗散能增加,应力松弛能力得到提高。在相同温度下,多聚磷酸改性沥青延缓了沥青进入蠕变稳定期的时间,但随着温度的降低,达到蠕变稳定期的时间缩短。多聚磷酸改性剂的添加可以提高沥青低温性能,且随质量分数的增加,低温改善效果更好;但随着温度的降低,多聚磷酸对沥青的低温改善程度减小,且不同质量分数对其影响的差异也减小,在-24℃以上适合使用多聚磷酸改性,而在-24℃以下掺入多聚磷酸改性沥青意义不大。
[Abstract]:Based on the viscoelastic theory, the low temperature bending rheological tests of polyphosphoric acid modified asphalt and matrix asphalt with different mass fraction of 0.5 wt and 1.0 wtand 1.5wt and 2.0wtrespectively were carried out. The creep data obtained from the rheological tests of low temperature bending beams were fitted with Burgers model. Using the four parameters of the Burgers model, E _ s _ 1, 畏 _ _ _. The low temperature properties of polyphosphoric acid modified asphalt were analyzed. The results showed that the viscosity and elasticity of asphalt were improved with the addition of polyphosphoric acid, the relaxation time in asphalt decreased, the storage energy decreased, and the dissipation energy increased. The stress relaxation ability was improved. At the same temperature, the polyphosphate modified asphalt delayed the time of entering the creep stability period, but with the decrease of temperature, The addition of polyphosphate modifier can improve the low temperature performance of asphalt, and with the increase of mass fraction, the effect of low temperature improvement is better, but with the decrease of temperature, The degree of improvement of polyphosphoric acid on asphalt at low temperature is reduced, and the influence of different mass fraction on it is also reduced. It is suitable to use polyphosphoric acid above -24 鈩，

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