通过加速加载试验、低温弯曲试验、飞散试验研究了泡沫沥青和水泥两种粘结材料对泡沫沥青冷再生混合料(CRMFA)长期高温抗变形能力、低温抗裂性以及抗松散性能的影响.研究结果表明:对CRMFA的长期高温抗变形能力而言,存在一个最佳泡沫沥青用量;增加水泥掺量有助于提高CRMFA的长期高温抗变形能力.CRMFA的低温柔韧性随泡沫沥青用量的增大而提升,但随水泥掺量增加呈抛物线变化规律,为保证CRMFA具有良好的低温抗裂性能,水泥掺量宜小于2wt％.CRMFA的抗松散性能较差,增加泡沫沥青用量可有效降低其松散性;水泥掺量在1.5wt％～2.5wt％时,对CRMFA抗松散性的改善作用不显著.
By means of accelerated loading test,low temperature bending test and Cantabro test,the influences of two binder materials,including foamed asphalt and cement,on the high temperature deformation resistance,low temperature crack resistance and raveling resistance of cold recycled mixtures stabilized with foamed asphalt (CRMFA) were studied.The results indicate that there exists an optimum dosage of foamed asphalt to acquire good high temperature deformation resistance of CRMFA.The increase of cement content is conducive to boosting the high temperature deformation resistance of CRMFA.The low temperature flexibility of CRMFA increases with the increase of foamed asphalt content,but assumes parabolic relationship with the increase of cement content.To insure the favorable low temperature crack resistance,the dosage of cement is recommended to be less than 2wt％.The raveling resistance of CRMFA is poor and the increase of foamed asphalt content helps to effectively reduce the raveling resistance of CRMFA.The improvement of raveling resistance for CRMFA becomes non-significant while the addition content of cement increases to 1.5wt ％-2.5wt％.
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