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运用正交试验方法探讨了免振捣混凝土工作性和强度的规律，研制出了Ｃ５０ 和Ｃ６０ 级免振捣混凝土，并在工程中得到应用。
Orthogonal test method was used to investigate the workability and strength of vibration-free concrete, and C50 and C60 grades of vibration-free concrete were developed and applied in the project.