摘要
研究了我国的VMA规定值和计算方法。指出了我国普遍使用的马歇尔设计方法,根据集料公称最大粒径规定的最小VMA值,与美国马歇尔设计方法给定的最小VMA及美国Superpave设计方法规定的最小VMA值,本质上是一致的,但计算方法却不同。采用现行计算VMA的4种方法,计算了25种工地沥青混合料的VMA值。我国的粗集料用毛体积相对密度,细集料用表观相对密度计算VMA的方法和美国的方法所用公式形式一样,但我国计算的VMA比美国方法计算的VMA均偏大。在实际使用时,建议按照细集料含量与细集料平均吸水率的乘积大小,修正我国计算公式,使之接近沥青混合料的真实VMA。
The specified value of VMA and its computation method are studied. We find that the specified value of VMA in China is the same as that of VMA in America and that the computation methods are different. The VMA values of 25 kinds of job mixtures are computed with 4 kinds of different methods. The result shows that the VMA value computed by percent air voids in bituminous mixture plus percent total bitumen volume in bituminous mixtures is bigger than the VMA value by America method. When we use the bulk specific gravity of coarse aggregate and the apparent specific gravity of fine aggregate to compute VMA value, the VMA value is bigger than the VMA value computed by America＇ method. It is suggested that correcting the VMA value of computation by China＇ method according to the product of fine aggregate content and the average water content of fine aggregate.
出处
《中南公路工程》
2006年第3期86-90,共5页
Central South Highway Engineering
关键词
道路工程
沥青混合料矿料间隙率(VMA)
集料毛体积相对密度
表观相对密度
highway engineering
percent voids in mineral aggregate in bituminous mixtures （VMA）
bulk specific gravity of coarse aggregate
apparent specific gravity of fine aggregate
computation method
