The solid strength of the concrete structure is different to the sample cured under the standard condition, and it is difficult to be accurately tested by the indirect ways.
结构实体中混凝土的实际强度与标准养护的立方体强度不同，也很难准确地用间接推定的强度来测定。
A new method for unbiased estimating standard deviation of strength of concrete of inspected lot is proposed in this paper.
给出了一种混凝土验收批强度标准差的无偏估计方法。
Test results showed that the best ratio of pearlite powder to cement was 15% for standard compressive strength of concrete when the strength was the highest;
对混凝土强度的绝对值而言掺合料的最佳掺量为15％（质量分数），此时混凝土强度最高；
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