The consolidating wave speed changes distinctly in 7 days, so it makes up the loss that in being non-destructive testing technology couldn't be used to test the fresh concrete strength.
固结波速在混凝土7天龄期内变化尤为显著，这弥补了现有的混凝土无损检测技术不能应用于检测早龄期(特别是7天龄期以前)混凝土强度这一空白。
These testing method should be operated easily and testing data should correspond with the property of fresh concrete.
力求通过简便可行的检验，其结果能够与新拌混凝土的性能有很好的相关关系。
These testing method should be operated easily and testing data should correspond with the property of fresh concrete. Key words: ready- mix concrete;
从新拌混凝土的质量要求和主要性能指标出发， 对相应的水泥性能指标及检验方法的建立提出了建议。
These testing method should be operated easily and testing data should correspond with the property of fresh concrete. Key words: ready- mix concrete;
从新拌混凝土的质量要求和主要性能指标出发， 对相应的水泥性能指标及检验方法的建立提出了建议。
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