振动搅拌水泥稳定碎石的路用性能研究

Pavement performance of cement stabilized macadam based on vibration mixing technology

鉴于传统的水泥稳定碎石基层存在耐久性、均匀性差且易产生裂缝等问题,本文将振动搅拌技术应用于水泥稳定碎石,对其进行无侧限抗压强度、间接劈裂强度、动态抗压回弹模量、干缩、温缩和疲劳试验,并与传统搅拌水泥稳定碎石对比。结果表明:振动搅拌技术明显提高水泥稳定碎石的无侧限抗压强度、间接抗拉强度、动态抗压回弹模量,减小变异系数,缩短强度和变形的稳定时间,而且对低温时的温缩性能改善效果更加显著;该技术可提高水稳基层的早期强度,并节约0.5%的水泥用量,降低基层的成本;也可减小干缩应变、失水率、干缩和温缩系数,使干缩与温缩性能更好且更早趋于稳定;还可改善水稳基层的疲劳性能并延长其使用寿命。

In view of the issue of the traditional mixing cement stabilized macadam(CSM) base such as the poor uniformity, durability, and prone to cracking, the unconfined compressive strength, splitting strength, dynamic compression modulus, dry shrinkage, temperature shrinkage, and fatigue tests of the vibration mixing CSM were performed.The improvement of CSM with the vibration mixing technology was shown by the different test results.The results revealed that the unconfined compressive strength, indirect tensile strength, and dynamic compressive elastic modulus increased, whereas the variation coefficient of strength decreased due to the vibration mixing technology. The stabilization time of strength and deformation decreased.Moreover, the vibration mixing technology had a significant influence on the temperature shrinkage performance of CSM at low temperature.The use of vibration mixing technology developed the high early strength of CSM and saved 0.5% cement content, hence the cost of the base was decreased.The dry shrinkage strain, water loss rate, dry shrinkage coefficient, and temperature shrinkage coefficient of the CSM decreased, resulting in an improvement of shrinkage performance.The fatigue characteristics and the service life of CSM were increased by the vibration mixing technology.