排水沥青混合料技术要求的探讨

Discussion on Technical Requirements of Porous Asphalt Mixture

摘要:

讨论了现行多部排水（或透水）沥青混合料标准中关于高黏度改性沥青的黏度（真空毛细管法）、高黏度改性剂灰分含量技术要求、纤维材料的使用规定存在矛盾等问题，并分析了配合比设计中沥青用量计算公式错误的原因，推导出了正确的沥青用量和沥青膜有效厚度计算公式。分析表明：真空毛细管法不适用于评价高黏度改性沥青的黏度；现行标准中的沥青膜厚度要求值应降低；高黏度改性剂的灰分含量不宜作为评定指标。

Abstract:

The problems of viscosity (vacuum capillary method) of high-viscosity modified asphalt, technical requirements for ash content of high-viscosity modifiers and the use of fiber materials in the current standards of porous (or permeable) asphalt mixture are discussed. The reason of wrong calculation formula for asphalt content in mix ratio design is analyzed. The correct formula for calculating the amount of asphalt and the effective thickness of asphalt film is derived. The analysis shows that vacuum capillary method is not suitable for assessing the viscosity of high-viscosity modified asphalt. The required value of asphalt film thickness in current standards should be reduced. The ash content of high-viscosity modifier should not be used as an evaluation index.