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正交多项式统计Na～R_(28)回归线 1978年,我们用国产天津N-2型回弹仪对令期28天,取自不同工程对象、自然养护的渡口普通硅酸盐水泥混凝土试块试测,按平均回弹值N_a(按常用方法计算求得)和试块抗压强度R_(28)相关统计。实测试块150多个(图5),测点4000余个。平均回弹值N_a按常用方法舍去一组测点内的较大较小值后算术平均,实测N_a在23～44之间,实测混凝土试块强度R_(28)在70～480公斤/厘米~2之间。统计方法采用
Orthogonal Polynomial Statistics Na~R_(28) Regression Line In 1978, we used the domestic Tianjin N-2 type rebound test equipment for a period of 28 days, taken from different project objects and naturally preserved ferry normal portland cement concrete test blocks. Measured, according to the average rebound value N_a (according to common calculation method) and the compressive strength of the test block R_ (28) statistics. There are more than 150 actual test blocks (Figure 5), with more than 4,000 measuring points. The average rebound value N_a is rounded off according to the common method of calculating the larger and smaller value within a group of measuring points. The measured N_a is between 23 and 44. The measured concrete block strength R_(28) is between 70 and 480 kg/cm. Between ~2. Statistical methods used