连续级配的级配碎石材料试验研究

Experimental Research of Continuous Grading Macadam Materials

传统概念认为,n=0 4～0 5的连续级配具有最大的密实度。本文对连续级配的级配碎石细集料和级配碎石混合料进行系统的室内试验研究,并相应地对试件进行击实成型与振动成型的比较研究,论证了当前现场碾压设备由清一色的光轮压路机发展为以振动压路机为主以后,以最大密实度为理论基础制定规范级配的最佳n值,并非固定为0 4～0 5。而一系列的测定数据表明:级配碎石基层材料的路用性能可以提高,它是材料与压实工艺相互作用的结果。

Traditionally it is considered that continuous grading mixture has the maximam compactness.This paper presents a systematic indoor experiments to study continuous grading macadam materials,including fine materials and mixture materials,combined with comparison betwen heavy compaction samples and vibration compaction samples.The experiments show that the best value n to constitute standard grading based on the theory of maximum compactness is not fixed over 0.4～0.5 when rolling equipments have developed from flat wheel roller to the vibration roller.A serial of experimental data show that the road performance of grading macadam base materials can be improved,it is the result of the combination of the improvement of the materials and the compact.