Abstract:

Fractal theorγis of special merits in processing random and discrete data. When it is adopted to analyze the rebound testing data of random and discrete compression strength of concrete , much more reliable results can be obtained , as compared with the general regression method. In this paper , the Rebound Measuring Point PositionRebound Value curve (RPV curve) on a 2D coordinate plane is established , and the box-dimension calculation inethod is adopted to design a calculation program to obtain the fractal dimension of the RPV curve and to calculate the compression strength of concrete. The results show that there is a linear relationship between the fractal dimension of the RPV curve and the compression strength , and that the proposed method can calculate the compression strength without testing the carbonation depth. Moreover , it suits the compression strength testing of concrete with big volumes and thus offers a new simplified approach to the detection of the compression strength of concrete.

Key words: concrete, compression strength, rebound method, data analysis, fractal, RPV curve