用石灰粉煤灰稳定粒料和土做高速公路的基层与底基层,在我国使用越来越多。笔者结合济南绕城高速公路东线工程八合同段的经验教训,系统阐述二灰土的配合比设计中应注意的几个关键问题。在进行配合比设计前,必须对原材料进行检测,以满足设计要求。——石灰石灰中氧化钙和氧化镁的含量对二灰类材料的强度有明显影响,用于二灰土的石灰应符合Ⅲ级消石灰或Ⅲ级生石灰技术标准。有效钙含量在20%以上的等外石灰,通过试验,只要混合料的强度符合规范要求,也可以使用。值得注意的是,生石灰必须在使用前7天进行充分消解,否则,未充分消解的生石灰在成型的二灰土中容 With lime and fly ash to stabilize the particles and soil to do the grassroots and subsoil of the expressway, more and more used in our country. Based on the experience and lessons of the eighth contract section of the east line project of Jinan Ring Expressway, the author systematically expounds several key issues that should be paid attention to in the mix design of lime-flyash soil. In the mix before the design, the raw materials must be tested to meet the design requirements. - The content of calcium oxide and magnesium oxide in lime lime has a significant effect on the strength of lime-gray materials. The lime used in lime-lime soil should meet the technical standards of grade III or lime lime. Effective lime content of more than 20% of the lime, through the test, as long as the strength of the mixture meets the specifications, can also be used. It is noteworthy that quicklime must be fully digested seven days prior to use, otherwise, insufficiently digested lime in the lime content of the molding