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中国JTG F40-2004《公路沥青路面施工技术规范》关于确定改性沥青混合料最大理论密度的方法仅适用于吸水率为0.5%～1.7%范围内的混合料,对于吸水率远远超过该范围的多孔性钢渣不适用。为了找到一种合适的确定多孔性钢渣改性沥青混合料最大理论密度的方法,该文提出了采用改性沥青浸渍法实测多孔性钢渣的有效相对密度,从而通过测定的有效相对密度计算得到了沥青混合料最大理论密度。进一步根据实测多孔性钢渣有效相对密度计算了吸水率w与沥青吸收系数C之间的关系。结果表明:通过改性沥青浸渍法测定的多孔性钢渣有效相对密度比较合理,其值介于毛体积相对密度和表观相对密度之间;计算得到的吸水率w和沥青吸收系数C的关系式同规范相比差别较大,进一步说明规范中关于确定改性沥青混合料最大理论密度的方法对于多孔性钢渣不适用;最后该文建议可以通过改性沥青浸渍实测法得到多孔性矿料有效相对密度,为确定改性沥青混合料最大理论密度提供了一种新的方法。
China JTG F40-2004 “road asphalt pavement construction specifications” to determine the maximum theoretical density of modified asphalt mixture method is only applicable to the water absorption rate of 0.5% ~ 1.7% range of mixture, for the water absorption rate far beyond this range Porous steel slag does not apply. In order to find a suitable method to determine the maximum theoretical density of porous steel slag modified asphalt mixture, this paper proposes to measure the effective relative density of porous steel slag by modified asphalt impregnation method, which is calculated from the measured effective relative density Asphalt mixture maximum theoretical density. Based on the measured relative effective density of porous steel slag, the relationship between water absorption w and asphalt absorption coefficient C was also calculated. The results show that the effective relative density of porous steel slag determined by the modified asphalt impregnation method is reasonable, and the value is between the relative density of gross volume and the apparent relative density. The relationship between calculated water absorption w and asphalt absorption coefficient C Which is different from the specifications. It further shows that the method of determining the maximum theoretical density of modified asphalt mixture is not applicable to porous steel slag. Finally, the paper suggests that the effective relative porosity of porous mineral can be obtained by the modified bitumen impregnation method Density, to determine the maximum theoretical density of modified asphalt mixture provides a new method.