水泥碎石混合料是各级公路,特别是高等级公路的基层混合科,设计时多采用水泥稳定碎石做为路面结构的上基层。它起着承上启下的重要作用,它的早期强度,尤其是后期强度以及抗裂性能的好坏,将直接影响公路的耐久性,即公路的使用寿命。水泥碎石具有早期强度高、板体性好、抗水性和耐冻性等优点,但后期强度缓慢,易产生收缩裂缝。为了提高延缓水泥碎石的后期强度,克服收缩裂缝的缺点,我们在河南焦郑高速公路基层施工中掺入粉煤灰,通过室内试验,选择最佳配合比,获得了较好的效果。粉煤灰是一种硅质的或硅铝质材料,它是火力发电厂的 Cement crushed stone mixture is the grassroots mixing section of highway at all levels, especially on high-grade highways. In design, cement stabilized macadam is used as the upper layer of pavement structure. It plays an important role in bearing on and off, its early strength, especially the late strength and cracking performance will directly affect the durability of the road, that is, the service life of the highway. Cement gravel has the advantages of high early strength, good board body, water resistance and frost resistance, but the late strength is slow, easy to produce shrinkage cracks. In order to improve the late strength of cement gravel and overcome the shortcomings of shrinkage cracks, we mix fly ash into the construction of the grassroots level of Jiaozheng Expressway in Henan Province. Through indoor tests, we select the best compounding ratio to obtain better results. Fly ash is a siliceous or siliceous material, which is a thermal power plant