旧沥青路面铣刨料的CBR试验研究

CBR Test on Old Asphalt Pavement Milling Mixture

加州承载比CBR作为国际道路上公认的道路评价指标,在柔性基层、底基层评定上有着广泛的应用,采用路面材料强度仪,对RAP料做浸水前后的CBR值测定。结果表明:随着RAP料含水率的提高,CBR值先增大至最佳含水率而后减小,未浸水RAP料的CBR值和RAP料压实度有着良好的二项式回归关系,较大压实度的RAP料可以有效抵抗外界水损害,级配是影响RAP料CBR值的最大因素。

CBR（ California Bearing Ratio）,as a recognized international road evaluation index,has been widely used in assessment of flexible base and subbase. With pavement material strength tester,the CBR values of RAP material before and after soaking were tested. The results show that,as the moisture content of RAP material increases,the CBR value first increases to the optimum moisture content and then decreases; the relationship between the CBR value of RAP material without soaking and the compaction degree thereof present fine binomial regression; the RAP material that has large degree of compaction is competent in resistance to external water damage; and grading is the factor most important to affect the CBR value of RAP material.