沥青的酸值对沥青混合料水稳定性的影响

沥青与石料的粘附性好坏直接影响沥青混合料的耐久性。如果沥青选择不当且不掺外加剂，就很难得到稳定的沥青混合料。为此，探讨了不同性质的沥青对混合料水稳定性的影响，并提出了满足沥青混合料水稳定性指标的沥青酸值范围。酸性石料组成的混合料，必须对沥青进行改性处理后才能满足水稳定性要求。中性石料组成的混合料，当沥青酸值＞３．２ｍｇＫＯＨ／ｇ时，能满足抗水害要求；当沥青酸值＞３．５ｍｇＫＯＨ／ｇ时，混合料间接抗

THE EFFECT OF ASPHALT ACID NUMBER ON WATER RESISTANCE OF ASPHALT MIXTURES

The adhesivity of asphalt with aggregates directly affect the durabality of the asphaltmixtures. A stable a sphalt mixture can not be obtained without proper asphalt selection and additive addition. The effect of asphalt property on water resistance of asphalt mixtures were investigated, and theacidity number is proposed to use as an index for evaluation. The asphalt mixture composed of acidic aggregate needs a pretreatment of the asphalt. The asphalt mixture composed of neutral and basic aggregatecan meet low temperature requirements when the acidity number of the asphalt is higher than 3. 5mgKOH/g and 0. 75 mgKOH/g respectively.