On the other hand, the classification of the types of pavement (conventional, moderately flat, flat, very flat or super flat) is linked to the FF / FL value that is intended to be obtained, thus being much more objective. This standard has two great advantages: On the one hand, the measurement taking into account all the lines taken in the same pour, and at the same time taking into account all the building stones, allowing a certain tolerance to have better and worse areas, without losing of sight a minimum value necessary in function, above all, of the height of storage. Therefore, the FF give us a value that defines the undulation of the pavement, and FL its horizontality. The American standard ASTM 1155: This standard differentiates two parameters of measurement: Number FF (Face Flatness), which measures differences in intervals of 1 foot (or 30cms in its metric version), and FL (Face Levelness), which gives us differences in 3 meter mesures.The ambiguity of these concepts, in addition to the problems of precision presented by the measure with rules, makes it an unwise option when it comes to demand. This tolerance is different depending on the type of pavement: Concrete base, of little use, normal and higher demands. The german standard DIN 18202: It is based on the measurement with rules, on the tolerance in mm that is between a rule of 0.1, 1, 4, 10 and 15 meters and the slab.Broadly speaking, we have 3 standards that can be referenced in the specifications of a random traffic pavement: Random traffic: Generally, the measurement standards to validate this type of demands are based on randomly measuring a certain number of linear meters of the floor made. For this we will make a first distinction depending on the type of traffic, which may be of two types, totally incompatible with each other, that is, it will not be possible to make a pavement suitable for both types of traffic. We are going to focus on this article on how we should choose those tolerances depending on the final use to which the slab will be subjected. Rare will be the pavement where we do not need to resemble a plane.īeing it is not possible, from a practical point of view, to get a perfect plane with concrete, every pavement should bring in its specification what degree of deviation on that ideal will be allowed, and it will depend on whether we are inside those tolerances, the quality of the work we have done. Even when we execute it with slopes due to operational requirements, generally of water evacuation, we need that inclined element to be as homogeneous as possible. Flatness is the main characteristic that we request a slab. As a general rule, we make the pavements with the premise that they are flat.
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