高模量沥青混合料及高模量剂技术要求探讨

Discussion on Technical Requirements of High Modulus Asphalt Mixture and High Modulus Additive

摘要:

高模量剂常用于改善沥青混合料的模量、抗车辙和抗疲劳性能，不同标准关于抗高模量剂以及高模量沥青混合料的技术要求存在差异或矛盾。比较了不同标准的高模量剂的密度、熔体质量流动速率、灰分技术要求，也比较了不同标准的高模量沥青混合料的动态模量、动稳定度、疲劳寿命技术要求，同时对高模量剂的密度和灰分含量进行了试验。在标准修订时，对于高模量剂的密度应规定试验温度，灰分含量和熔体质量流动速率技术要求应作调整。高模量沥青混合料的动态模量技术要求应包含20 ℃、10 Hz的规定值，动稳定度技术要求应包含60 ℃的规定值，疲劳寿命技术要求应包含20 ℃、10 Hz的规定值。这些规定值可作为沥青路面设计的设计参数。

Abstract:

High modulus additive is commonly used to improve the modulus, anti-rutting and anti-fatigue performances of asphalt mixture. There are differences or contractions in the technical requirements for high modulus additives and high modulus asphalt mixture among different standards. The technical requirements for density, melt mass flow rate and ash content of high modulus additives of different standards are compared. The technical requirements for dynamic modulus, dynamic stability and fatigue life of high modulus asphalt mixtures of different standards are also compared. Meanwhile, tests are conducted on the density and ash content of the high modulus additives. When the standard is revised, the testing temperature for density of the high modulus additive should be specified, and the technical requirements for ash content and melt mass flow rate should be adjusted. The technical requirements of dynamic modulus for high modulus asphalt mixtures should include the specified values at 20 ℃ and 10 Hz, the technical requirements of dynamic stability should include the specified values at 60 ℃, and the technical requirements of fatigue life should include the specified values at 20 ℃ and 10 Hz. These specified values can be used as design parameters for the design of asphalt pavement.