1. Can you send a "Instructions for Rebound Meter"? 2. Can you tell me about the calculation of the strength of the rebound meter?

The first step is to calculate the Rm of each measurement area, remove the 3 highest values, remove the 3 lowest values, and average the remaining 10 values ??as the representative values ??of the measurement area for angle correction ( If there is no angle, there will be no correction). If only one component is bomb tested, 10 strength values ??will be estimated based on the carbonization correction of the 10 test areas you described, and the strength will be evaluated. At this time, the statistical method of n = 10~14 groups will be used

If it is not one component but multiple components of an inspection batch, n representative values ??of the estimated strength obtained by angle correction and carbonization correction of the representative value of the measurement area are used respectively, according to n=15~24 Or λ1 and λ2 with n ≧25 are evaluated by statistical methods. When the calculated average standard deviation strength is less than 25MPa and Sfcu>4.5MPa, the batch of components should all be tested as a single component.

. For example: the average intensity representative value estimated in each measuring area is 24, but the calculated Sfcu reaches 4.6MPa, then λ1 and λ2 based on n=15~24 or n≧25 cannot be used for statistical evaluation. It can only be evaluated based on a single component (λ1 1.7, λ2 0.9 for n=10~14 groups). To put it more simply, it means that you cannot enjoy the "preferential treatment" of smaller λ1 and λ2 coefficients!