高速公路沥青路面水损害部分原因分析

路面早期产生的大量水损害已经严重影响到路面的使用性能。通过室外观察及室内实验模拟比较,发现粗集料表面附着的粉尘对粗集料与沥青的粘附性等级至少会因此降低1级,从而诱发早期水损害的产生;回收粉的使用将大大降低沥青混合料的水稳定性,也会增大沥青路面发生早期水损害;标准密度的选取在很大程度上决定沥青混凝土路面的实际空隙率。经过分析,认为应该采用最佳沥青用量对应的理论密度作为标准密度,这样才可以有效控制路面的实际空隙率。

On the Causes of Asphalt Pavement Water Induced Damage

Water induced damages have great impact on pavement performance.Through indoor experiments and field observations,some conclusions about the causes of the early damage due to water had been reached:the cohesion between asphalt and coarse aggregates would be degraded by at least one grade caused by the dust adhering on the surface of the existing aggregate,which would result in the distresses of pavement;replacing the pure mineral powder with the mixture of recycled dust and stone powder would lower the water-resistant stability of asphalt concrete.Finally,the way of choosing standard density that would affect the void of HMA dramatically was discussed,and the theoretical density was suggested to be taken as a new standard for the purpose of decreasing the actual volume of void (VV) of HMA properly.