一、引言 我局工程处第二建筑段预制厂为生产混凝土预制构件的专业厂,担负着繁重的生产任务。通常混凝土的搅拌方式均采用石、砂、水泥与水一次混合投入搅拌机的投料方法,简称为一次投料法。这种搅拌方法存在较大的缺陷。只要我们在搅拌机前仔细观察就会发现:水泥颗粒被砂、石夹裹着进入搅拌机内,遇水 I. INTRODUCTION The second prefabrication section of the Agency’s Engineering Department is a specialized factory for the production of prefabricated concrete components, and is responsible for the heavy production tasks. Usually the concrete mixing method adopts the feeding method of stone, sand, cement and water to mix into the mixer once, which is referred to as one feeding method. This stirring method has a big drawback. As long as we carefully observe before the mixer, we will find that: cement particles are wrapped in sand and stone clips and enter the mixer.