AUTHENTICITY OF QUALITY CONTROL OF DRY CONSTRUCTION MIXTURES
Existing regulatory documents relating to control of quality indicators of dry construction mixtures do not reflect the authenticity of the control, and this increases manufacturer’s and consumer’s risks. Given that the authenticity of control depends on the accuracy of measurements and the volume of control, errors of the first and second type for the quality control of dry construction mixtures for each of the measurement parameters were calculated as exemplified by a light mortar for plastering. In calculating the authenticity of control it was adopted that the quality indicators distribution law is normal, the systematic manufacturing error equals to zero, the product tolerance range is limited by the upper and lower tolerances, the tolerance range middle coincides with the quality indicator average value, the measurement error obeys the normal law of distribution. Information about the authenticity of dry construction mixtures quality control depending on the quantity of controlled parameters is provided. It is shown that, when the number of control parameters is more than eight, manufacturer’s and consumer’s risks are increased, the authenticity of control becomes smaller than the standard value equaling to 95 %. For the purpose of improving the authenticity of control of quality indicators of dry construction mixtures it is proposed to reduce the error of measuring instruments.