根据颜料颗粒的表观密度，控制囊芯中固体颗粒的体积分数。
The solid content in the core materials was controlled through the apparent density of the particles.
随着焙烧温度的升高，比表面积、孔体积略有减少，表观堆密度增大。
The apparent density increased with the increase of calcination temperature, while the surface area and pore volume decreased little.
我国的粗集料用毛体积相对密度和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，但用我国方法计算的VMA比用美国方法计算的VMA均偏大。
When the bulk specific gravity of coarse aggregate and the apparent specific gravity of fine aggregate are used to compute VMA value, the VMA value is greater than the VMA value by American method.
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