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一如果同一检验批9组试件中,有7组强度代表值高于强度标准值,而有2组低于强度标准值,高者占78%,该检验批混凝土强度能否合格?混凝土强度等级是按立方体抗压强度标准值确定的。强度标准值确定原则是混凝土强度总体强度分布的平均值减去1.645倍标准差,也就是说,对应保证率为95%。混凝
If the same test batch 9 specimens, 7 sets of strength representative value is higher than the standard value of strength, and 2 sets below the standard value of strength, the highest accounted for 78%, the test batch concrete strength can pass? Concrete strength The grade is determined by the cube compressive strength standard value. The principle of determining the strength standard value is the average of the overall strength distribution of concrete strength minus 1.645 times the standard deviation, that is, the corresponding guarantee rate is 95%. Coagulation