沥青混合料用抗车辙剂技术要求分析

Discussion on Technical Requirements of Anti-rutting Additive for Asphalt Mixture

摘要:

抗车辙剂常用于改善沥青混合料动稳定度，但不同标准的抗车辙剂试验检测项目及技术要求存在差异或矛盾。比较了不同标准的抗车辙剂技术要求，包括：密度、熔体质量流动速率、灰分、吸水率、熔点。一些标准未注明抗车辙剂的试验条件或试验方法。标准应注明抗车辙剂密度试验的试验温度和试验方法（浸渍法、液体比重瓶或滴定法），吸水率试验的浸泡温度；熔体质量流动速率技术要求应作调整；当灰分含量试验的煅烧温度按新的试验方法采用620 ℃时，技术要求应作调整。采用NH?HCO?或（NH?）?CO?对抗车辙剂煅烧后的残渣进行处理，可准确得到抗车辙剂中的无机成分。

Abstract:

Anti-rutting additive is commonly used to improve the dynamic stability of asphalt mixture. There are differences or contractions in testing items and technical requirements for anti-rutting additives among different standards. The technical requirements for anti-rutting additive in different standards are compared, including density, melt mass-flow rate (MFR), ash content, water absorption and melting point. Several standards lack a clear indication of testing conditions or methods for anti-rutting additive. Its testing temperature and method (that is immersion method, liquid pyknometer method or titration method) for density, and soaking temperature for water absorption should be clearly indicated in these standards. The technical requirement for melt mass-flow rate (MFR) should be adjusted. If the calcination temperature for ash content is 620 ℃ according to the new testing method, its technical requirement should be adjusted. The inorganic components in the anti-rutting additive can be accurately obtained by treating the residue after calcination with NH₄HCO₃ or (NH₄)₂CO₃.