| Summary: | The ready-mixed concrete is subject to certification in accordance with the compliance system 2+. Manufacturers of concrete are required to implement factory production control and then to certify concrete, which is subject to the national mark B. The paper presents the results of strength tests of C 40/50 concrete samples. Designed according to the 23M SCC recipe, concrete has been used in the production of freight scales. The samples were subjected to "in situ" tests. As a method of quality control, a non-destructive test method for concrete strength has been proposed. A sclerometer (Schmidt type N hammer) was used for the tests. The research used a dynamic method of measurement by evaluating the change in the energy of the beater after rebounding from a given surface. Normal cubes with dimensions 15x15x15 cm were used for the tests. Concrete testing was carried out after the 28th day of care in accordance with the requirements of PN-EN 2390-2:2001. Based on the analysis, conclusions from the tests were formulated. The compression strength class was determined and the conformity of the hardened concrete with the parameters declared by the manufacturer was controlled. The evaluation was carried out using methods B and C for continuous production. CUSUM cumulative sum control cards and Shewhart control cards were used.
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