What changes for the mix design procedure will be required?

配料设计方案会进行什么改变？

The theory of concrete mix design should also be perfected.

免振捣混凝土的配比设计理论也需要进一步地加以完善。

Therefore, the study of optimizing mix design must be enforced.

因此，级配优化研究工作势在必行。

The paper analyzed the problems of C50 concrete mix design, and proposed some protective measures.

对C50混凝土配合比设计中值得注意的几个问题进行分析，并提出相应的防治措施。

The way to determine economical dosage of HRWRA was pre sented based on a case history of mix design.

通过一个配合比设计实例，介绍了减水剂经济掺量的确定方法。