BRITISH STANDARD BS EN 13454 1 2004 Binders, composite binders and factory made mixtures for floor screeds based on calcium sulfate — Part 1 Definitions and requirements The European Standard EN 13454[.]
BRITISH STANDARD Binders, composite binders and factory made mixtures for floor screeds based on calcium sulfate — Part 1: Definitions and requirements The European Standard EN 13454-1:2004 has the status of a British Standard ICS 01.040.91; 91.100.10; 91.100.50 12&23 300 1,80 1,42 10.2.3 Inspection by attributes The number of test results outside the characteristic value cD out of the totality of autocontrol test results obtained on all samples taken during the control period shall be counted and compared with an acceptable number cA calculated from the number n of autocontrol test results and the acceptable overall percentage Pk of 10 % Conformity is verified when the following equation is satisfied: cD ≤ c A Values of cA are listed in Table 10 The values are valid for Pk = 10 % acceptable overall percentage and % probability of acceptance CR of a lot not conforming to the requirements 10.3 Assessment based on individual results for factory made mixtures Where individual results are used to assess conformity for factory made mixtures with requirements of this document all test results shall equal or show a favourable variance on the characteristic value of the declared class for the individual test NOTE With respect to the compressive and flexural strengths, it is recommended that the result exceeds the characteristic value of the declared class by a margin of 10 % 10.4 Conformity requirements Sampling shall take place at the exit of the plant of the binders, composite binders and factory made mixtures Ready mixed products can also be sampled on site The minimum test frequency and the statistical assessment procedure is specified in Table 11 for each property to be tested 17 EN 13454-1:2004 (E) Table 10 — cA values a Number of test results cA n (Pk = 10 % ; CR = %) 20 to 39 a 40 to 54 55 to 69 70 to 84 85 to 99 100 to 109 If the number of test results is n < 20 a statistical criterion is not possible In this case cA is always equal to Table 11 — Minimum test frequency and statistical assessment procedure Minimum test frequency Inspection by Property a 18 Binders Mixtures variables or individual results attributes CaSO4 per month − − X pH per day per day − X Flow diameter/Spread − per week a − X Setting time/Working time per week per week a − X Shrinkage or swelling per year per year − X Strength per week per week X − or one measurement every 100 m or 200 t of dry mixture