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为了分析成型方法对开级配大粒径沥青碎石(OLSM)技术性能的影响,采用马歇尔试验、劈裂试验和贯入试验等方法,研究成型方法对OLSM空隙率、集料级配、力学强度和回弹模量的影响,以期推荐不同用途下合理的OLSM成型方法。研究结果表明:试件体积规格对OLSM技术性能影响显著,体积规格Φ152.4mm的试件比Φ101.6mm的较能真实地反映OLSM的压实特性和力学强度;试件成型方法对OLSM集料级配影响显著,轮碾法、马歇尔击实法和旋转压实法引起集料破碎不显著,静压法引起集料破碎显著;试件成型方法对OLSM技术性能影响显著,轮碾法、马歇尔击实法和旋转压实法成型试件的稳定度与路面芯样实际值基本一致,静压法成型试件的稳定度远小于路面实际值;轮碾法成型试件的力学强度与路面实际值基本一致,马歇尔击实法和旋转压实法成型试件的力学强度略低于路面实际值,静压法成型试件的力学强度远低于路面实际值。当测定OLSM技术性能时,宜采用体积规格Φ152.4mm的试件,不宜采用体积规格Φ101.6mm的试件;当对OLSM进行配合比设计时,宜采用马歇尔击实法或旋转压实法成型试件;当测定OLSM力学强度时,宜采用轮碾法成型试件。
In order to analyze the effect of forming method on the performance of open-graded large-size asphalt pavement (OLSM), the effects of forming methods on the porosity, aggregate gradation, mechanics and mechanical properties of OLSM were studied using Marshall test, splitting test and penetration test. Strength and resilience modulus, in order to recommend a reasonable OLSM forming method for different purposes. The results show that the volume specifications of the specimens have a significant impact on the performance of OLSM. The volumetric characteristics of Φ152.4mm specimen can reflect the compaction characteristics and mechanical strength of OLSM more accurately than the Φ101.6mm specimen. Grading with significant impact, wheel grinding method, Marshall compaction method and rotary compaction method caused by aggregates broken is not significant, static crushing caused significant aggregate crushing; specimen forming method of OLSM technical performance significantly, wheel grinding method, Marshall Compaction method and rotary compaction method of the stability of the specimen with the core pavement actual value is basically the same, static pressure forming specimen stability is far less than the actual value of the road surface; wheel rolling method of forming the mechanical strength of the specimen and the actual road surface The results show that the mechanical strength of Marshall compaction method and rotary compaction method are slightly lower than the actual value of the road surface, and the mechanical strength of the hydrostatic test specimen is much lower than the actual value of the road surface. When measuring OLSM technical performance, it is advisable to use specimens with a volume of Φ152.4mm, which should not be used with a specimen with a volume of Φ101.6mm. When designing OLSM, the compaction method should be Marshall compaction or rotary compaction Specimen; When determining the mechanical strength of OLSM, wheel rolling method should be used to shape the specimen.