连续粒径粉体在浆体中的堆积密度

采用测定相同流动度时浆体需水量的方法,试验证明了不同粒径分布的矿粉其堆积密度有显著的差异.将浆体中的粉体颗粒及其表面包裹着的一层水膜作为复合颗粒,从而将求浆体中粉体颗粒堆积密度的问题转化为求假想复合颗粒体系的堆积密度问题,在Stovall模型的基础上推导了浆体中连续粒径粉体的堆积密度计算公式;通过试验确定了该公式中的待定参数值,并对公式的适用性进行了验证,结果表明:用该公式可以根据粉体的粒径分布计算它在浆体中的堆积密度. 

Packing density of powder in paste with continuous grain size distribution

The experimental resuh of measuring water requirements in paste under the same fluidity showed that there existed noticeable difference in packing density among the slag powders with different particle size distribution. By regarding the powder particles with the water film wrapping them as compounded particles, the packing density of powder particles in actual paste system was transformed into the packing density of compounded particles in imaginary dry-particle system. Based on Stovall model, a calculation method for packing density of powder with continuous particle size distribution in paste was developed. The parameters in the method were fixed and the validity of this method was verified by experiment. It was proved that with this method the packing density of powder could be calculated as long as the size distribution of powder was known.