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沸石粉对沥青及温拌SMA混合料性能影响研究

Research on the Influence of Zeolite Powder on the Performance of Asphalt and Warm Mix SMA

  • 摘要: 为分析沸石粉发泡作用及残留物对沥青和混合料从施工到服役2个不同阶段性能的影响规律,研究沸石粉对沥青及温拌沥青玛蹄脂碎石(SMA)混合料性能的影响,采用基于发泡降黏机理的沸石粉做温拌添加剂,根据沸石粉参与SMA混合料拌和中的不同阶段,分别设计对比性的沥青胶浆黏度、热重分析、混合料压实特性和常规路用性能等试验,分析沸石粉及其残留物对沥青性能的影响。试验结果表明,沸石粉的发泡作用可以在拌和初期降低沥青高温黏度,发泡作用结束后残留物会略微提高沥青黏度;沸石粉残留物对沥青的影响与等量矿粉类似,对针入度、软化点和延度等常规路用性能影响较小。通过温拌与热拌SMA混合料的马歇尔、飞散、析漏、车辙、弯曲和TSR等试验,分析沸石粉残留物及残留效应对混合料性能的影响,当沸石粉掺量为SMA混合料的0.3%时,温拌SMA混合料的力学性能、颗粒黏附、高温稳定性、低温抗裂性及水稳定性等路用性能相对热拌混合料均略有下降,对工程应用无明显影响。研究结果表明沸石粉可以提高沥青及温拌SMA混合料的各项性能,拌和与成型温度降低20℃的SMA混合料,其力学性能、抗飞散性能、高温稳定性和低温抗裂性均略有下降,但下降幅度微小,对路面服役无显著影响。

     

    Abstract: In order to analyze the influence of foaming effect of zeolite powder and residues on the performance of asphalt and mixture from construction to service, and to study the influence of zeolite powder on the performance of asphalt and warm mix asphalt tamar hoof fat lithotripsy(SMA) mixture, zeolite powder based on foaming viscosity reduction mechanism is used as warm mixing additive.According to the different stages of zeolite powder participating in SMA mixture mixing, comparative asphalt mortar viscosity test, thermogravimetric analysis, compaction characteristics of mixture and conventional road performance test are designed to analyze the effects of zeolite powder and its residues on asphalt properties. The results show that the foaming effect of zeolite powder can reduce the high temperature viscosity of asphalt in the initial stage of mixing, and the residue will slightly increase the viscosity of asphalt after the foaming effect. The influence of the residue of zeolite powder on asphalt is similar to that of the same amount of mineral powder, and has little effect on penetration, softening point, ductility and other conventional road properties. Through Marshall, flying, leakage, rutting, bending and TSR tests of warm mix and hot mix SMA mixture, the influence of zeolite powder residue and residual effect on the performance of the mixture are analyzed. When the zeolite powder dosage is 0. 3% of SMA mixture, the mechanical properties, particle adhesion, high temperature stability, low temperature crack resistance, water stability and other road properties of warm mix SMA mixture are slightly decreased compared with hot mix SMA mixture, which has no obvious influence on engineering application. The results show that zeolite powder can improve the performance of asphalt and warm SMA mixture. When the mixing and forming temperature is reduced by 20 ℃, the mechanical properties, flight resistance, high temperature stability and low temperature crack resistance of SMA mixture are slightly decreased, but the amplitude is small and has no significant influence on the road service.

     

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