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为研究半刚性基层材料的组成与疲劳性能间的关系,对几种代表性半刚性基层材料进行疲劳试验研究。通过对骨架密实水泥稳定碎石、悬浮密实水泥稳定碎石、骨架密实水泥粉煤灰稳定碎石和悬浮密实水泥粉煤灰稳定碎石梁试件进行三分点加载疲劳试验,得到室内疲劳预估模型,并进一步分析了材料组成对疲劳性能的影响。研究结果表明:骨架密实结构水泥稳定碎石疲劳性能普遍优于悬浮密实结构水泥稳定碎石;水泥粉煤灰稳定碎石的疲劳性能优于水泥稳定碎石;增加结合料剂量使得材料疲劳敏感性增加,但实际承载能力提高;级配稍细的骨架密实结构半刚性基层材料疲劳性能较好。
In order to study the relationship between the composition and fatigue properties of semi-rigid base materials, several representative semi-rigid base materials were subjected to fatigue test. Through the three-point loading fatigue test of the skeleton solid cement stabilized gravel, the suspended solid cement stabilized macadam, the skeleton solidified cement fly ash stabilized macadam and the suspended dense cement fly ash stabilized gravel beam, the indoor fatigue pre-fatigue The model was evaluated and the effect of material composition on fatigue performance was further analyzed. The results show that the fatigue behavior of cement-stabilized macadam skeleton solid structure is generally better than that of suspended solid cement stabilized macadam; the fatigue performance of cement-fly ash stabilized macadam is better than that of cement-stabilized macadam; increasing the dose of binder makes the material fatigue sensitivity Increase, but the actual carrying capacity increased; Smaller graded compact structure semi-rigid base material fatigue performance is better.