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采用间接拉伸强度、无侧限抗压强度及抗压回弹模量试验,分析了沥青路面旧料掺量及水泥用量对泡沫沥青冷再生混合料力学特性的影响。研究表明:随旧料掺量的增大或其中旧沥青含量的增多,泡沫沥青冷再生混合料设计最佳沥青用量减少,冷再生混合料抗拉、抗压、抗剪性能呈下降趋势,而抗压回弹模量逐渐增大;水泥用量的增大有助于提高冷再生混合料的强度、刚度及其水稳定性,但用量过大不利于冷再生混合料的抗裂性能,建议不超过2%;水泥用量较小(≤1.5%)的冷再生混合料强度增长主要集中于室温养生的24 h以及40℃烘箱养生的第1个24 h内,而水泥用量较大(1.5%～3%)的冷再生混合料养生期内强度增长比较匀速。
The indirect tensile strength, unconfined compressive strength and compressive resilience modulus test were used to analyze the influence of asphalt mixture content and cement dosage on the mechanical properties of foam asphalt cold recycled mixture. The results show that with the increase of the amount of old material or the increase of old asphalt content, the optimum amount of asphalt used in the design of foamed asphalt cold recycled mixture decreases. The tensile, compressive and shear resistant properties of cold recycled mixture decrease. The compressive rebound modulus gradually increases; the increase of cement content will help to improve the strength, stiffness and water stability of the cold recycled mixture, but it is not advisable not to use too much amount to resist the crack resistance of the cold recycled mixture (≥1.5%). The strength growth of cold-reclaimed mixtures mainly concentrated in 24 h at room temperature and within the first 24 h of oven curing at 40 ℃, while the cement content was larger (1.5% ~ 3%) of the cold regeneration mixture strength growth period of relatively uniform.