关键词: 沥青混合料, 低温抗裂性, 应变能密度临界值, 老化, 粒化聚合物

Abstract:

The low-temperature crack resistance of asphalt mixture was evaluated using the low-temperature bending test,  and the effect of aging, modified with granulated polymer and asphalt-aggregate ratio on the bending test at low temperature were respectively studied with indicators including failure strain, tensile strength, flexural-tensile modulus and strain energy density critical value. The results showed that the crack resistance of SBS modified asphalt and soft pitch is better than that of any other asphalt. The conclusion of evaluating the low temperature crack resistance by using critical value of strain energy density is consentaneous with the fact and  the defect of the high temperature stability of soft pitch may be overcome by mixing granulated polymer when using the advantage of its low temperature crack resistance.
 

Key words: asphalt mixture, low temperature crack resistance, strain energy density critical value, aging, granulated polymer