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在道路水泥混凝土工程中，质量管理是保证混凝土质量的一个重要环节。试件的标准离差σ可以作为评定施工单位质量管理水平的一个依据。这里介绍试件的取舍、强度保证率和离差产生的原因及对策等。
In the road cement concrete project, quality management is an important link to ensure the quality of concrete. The standard deviation σ of the specimen can be used as a basis for assessing the quality management level of the construction unit. Here to introduce the choice of specimens, the strength of the guarantee rate and deviation causes and countermeasures.