EN 1338-2003 pdf download.Concrete paving blocks – Requirements and test methods.
6.3.1 General
The manufacturer shall establish, document and maintain a factory production control system to ensure that the products placed on the market will conform with the specified or declared values.
The factory production control system shall consist of procedures, regular inspection and tests and the utilisation of the results to control raw and other incoming materials, equipment, the production process and the product.
An example of a suitable inspection scheme for factory production control is given in annex A.
The results of inspections requiring action and the results of tests shall be recorded
The action to be taken when control values or criteria are not met shall be given.
6.3.2 Equipment
All weighing, measuring and testing equipment shall be calibrated and regularly inspected according to the documented procedures, frequencies and criteria.
An inspection scheme for equipment is given in A.1.
6.3.3 Raw and other incoming materials
The specifications of all incoming materials shall be documented.
An inspection scheme for raw materials is given in A.2.
6.3.4 Production process
The relevant features of the plant and production process shall be defined giving the frequency of the inspection checks and tests, together with the criteria required both on equipment and on work in progress.
An inspection scheme for the production process is given in A.3.
6.3.5 Product testing
A sampling and testing plan of products shall be prepared and implemented.
The sample shall be representative of production.
The tests shall be carried out in accordance with the methods called up in this standard or applying alternative test methods with a proven correlation to the standard methods.
When the conformity criteria in this clause may be considered either by attributes or variables, the method
applied shall be at the manufacturer’s discretion.
6.3.8.1 Shape and dimensions
A. Attributes
The conformity of the production with 5.2 shall be assessed for each machine per production day (see sampling according to A.4.1 .3). Each of the requirements in 5.2 shall be considered separately.
a) If the sample consists of less than eight blocks (see switching rules in A.5) and each of the requirements in 5.2 for the declared class is complied with by all of the blocks, then the sample and the corresponding production shall be accepted. If not, this sample shall be increased to eight blocks and the procedure given in b) shall apply.
b) If the sample consists of eight blocks and not more than one of the blocks does not conform to any one of the requirements in 5.2 considered separately for the declared class, the sample and the corresponding production shall be accepted. If not, this sample shall be increased to 16 blocks and the procedure given in C) shall be applied.
C) It the sample consists of 16 blocks and not more than two of the blocks do not conform to any one of the requirements in 5.2 considered separately for the declared class, the sample and the corresponding production shall be accepted. If more than two of the blocks do not conform to any one of the requirements considered separately for the declared class, the sample and the corresponding production are not accepted and 6.3.7 applies.
B. Variables
When the standard deviation of a machine is known and regularly checked, the conformity of the production with 5.2 shall be assessed for each machine per day or consecutive production days not exceeding five (see sampling according to A.4.1 .3). Each of the requirements in 5.2 shall be considered separately.
The conformity is assessed on a 10 % fractile.
The acceptability of the samples considered shall be checked using a control chart conforming to either ISO 7966 or ISO 7873 and taking into account 5.2. provided the probability of acceptance is equivalent to that resulting from assessment by attributes.
If the sample and the corresponding production are not accepted, 6.3.7 applies.
6.3.8.2 Weathering resistance (class 2- water absorption)
The conformity of the production with 5.3.2 (class 2) shall be assessed for each family and for five prnduction days, or more according to the switching rules (see sampling according to A.4.1 .6).EN 1338-2003 pdf download.