混凝土经济配合比问题,是建筑材料中有关混凝土经济的一个长期课题。人们由於以往长期经验累积的结果,会经我到了一些降低混凝土成本的方法(在苏联的文献中可以见到),将来还会不断地找到更多降低混凝土成本的新方法。　了解,我国一般施工单位的任务都很紧迫,设计完成后不久即须 The problem of the economic mix ratio of concrete is a long-term issue related to the concrete economy in building materials. Because of the accumulated experience of long-term experience, people will come to me by some methods to reduce the cost of concrete (which can be seen in the Soviet literature). In the future, I will continue to find new ways to reduce the cost of concrete. Understand that the tasks of the general construction units in our country are very urgent and must be completed shortly after the design is completed.