NORME EUROPÉENNE. EUROPÄISCHE NORM. EN April ICS English version. Armourstone – Part 2: Test methods. Standard Swedish standard · SS-EN Armourstone – Part 2: Test methods. Status: Valid. Buy this standard. Price: 1 SEK. PDF. Add to cart. The European Standard EN has the status of a Swedish Standard. This document contains the official English version of EN.
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It supersedes BS EN A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Test methods Enrochements – Partie 2: E worldwide for CEN national Members.
This European Ej shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Novemberand conflicting national standards shall be withdrawn at the 1333-2 by November Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
This document supersedes EN In comparison with the previous version, the following changes have been made. Otherwise the majority of the changes from the previous version are 1383-2.
EN Armourstone consists of the following parts: This European Standard specifies the reference methods to be used for type testing and in case of dispute where an alternative method has been used. For other purposes, in particular factory production control, other methods may be 133383-2 provided that an appropriate working relationship with the test method has been established.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. Methods for sampling ENTests for general properties of aggregates — Part 5: Common equipment and calibration ENTests for geometrical properties of aggregates — Part 1: Determination of particle size distribution — Sieving method ENTests for geometrical properties of aggregates — Part 2: Determination of particle size distribution — Test sieves, nominal size of apertures ENTests for geometrical properties of aggregates — Part 3: Determination of particle shape – Flakiness index EN Determination of the resistance to wear micro-Deval ENTests for mechanical and physical properties of aggregates — Part 5: Determination of the water content by drying in a ventilated oven ISOTest sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal plate 3 Terms and definitions For the purposes of this document, the following terms and definitions apply.
This designation accepts the presence of undersize and oversize pieces of armourstone. For further information on grading, see EN With a continuous process the quantity produced during an agreed period is treated as a batch.
Test laboratories can determine the time required to achieve constant mass for specific types and sizes of sample dependent upon the drying capacity of the oven used. NOTE It is preferable that armourstone should be sampled at the quarry or during the loading for transport or unloading. The aim of sampling is to obtain samples that are representative of the average properties of the batch. The methods described are also suitable for obtaining sampling increments which are to be tested separately.
Methods to be used for sample reduction are also given. The correct use of the specified apparatus and methods helps to avoid biased sampling inclusive the possibility of human bias introduced by visual selection. Sampling variation caused by the heterogeneity of the batch shall be reduced to an acceptable level by taking an adequate number of sampling increments. NOTE For guidance on numbers and sizes of samples and test portions for testing armourstone as specified in EN Sampling increments are selected at random from all parts of the batch that the samples are to represent.
Armourstone from which no sampling increment can be taken because it is not accessible, or for some other practical reason shall not be considered to be part of the batch that is represented by the samples. For example, if sampling increments are taken from armourstone discharged from a silo, the samples represent the armourstone that has been discharged, not the armourstone remaining in the silo.
The sampler shall be informed of the aim of the sampling. The floor shall be sufficiently clean and close-textured to be able to distinguish and recover the material of the sample from the floor material.
Those involved in the planning and execution of sampling should work closely with the operational management to ensure safe working practices. Mechanically selected gradings should preferably be sampled from a stationary conveyor belt or from the stream of material.
Sampling increments should be taken at regular intervals throughout the period the batch is in motion. Gradings of which the pieces of armourstone are individually handled may be sampled at the most convenient location.
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Sampling from static batches should be avoided wherever possible since it is difficult to satisfy the ne of taking sampling increments at random from all parts of the batch, and hence segregation is likely to cause the sampling to produce biased results.
During sampling, grabs or other extraction equipment sn be filled to a minimum such that the degree of filling does not adversely affect the representative nature of the sample or sampling increment.
When this gives too large a sampling increment, it should be reduced by one of the methods described in 4.
A sample increment shall be taken by catching the discharge stream in a loader bucket, making sure that the complete cross-section of the stream of material is intercepted. At the beginning and the ending of the sampling the edge of the bucket shall pass the cross-section of the stream as fast as possible.
Samples may also be taken at the discharge from a screen by the same method. All sampling increments shall be taken at the same sampling point. In every sampling increment all material between two cross-sections shall be taken. The distance between the cross-sections shall be determined by the required quantity of the sampling increment.
During filling of a silo the material segregates and 13383–2 a result the finer material tends to be found in the centre of the silo with the coarser material along the wall sides. The number of sampling increments should be related to this variation.
For this purpose, the contents of one or more loader buckets, grabs, lorries or any other means of handling or transport shall be taken. The period during 133832 the sampling is done shall be divided into a number of equal intervals 1338-32 a sampling increment shall be taken in the middle of each interval.
If at the 13383- of sampling no material of a segregated stockpile is undergoing routine removal, the removal of material shall be simulated so as not to distort the representativity of the sampling increment with the segregation effects associated with the initiation of stockpile extraction.
The sampling increments shall be taken at random or at equal distances around the stockpile or part thereof to be sampled. When sampling from a non-segregated stockpile, a sampling increment shall be taken as indicated for een segregated wn or by taking a quantity of material from 1338-32 random location which is easily reached with the equipment available. Sampling increments shall be taken from across the pile by removing, at random or at equally distributed locations, adequate quantities of material whilst 133832 the possibly segregated material at the start and finish of the pile see Figure 1.
Take the material in strips over the full width of the pile or in equal numbers of half strips from the left and right hand side of the centre line of the pile. When one load contains insufficient material for one sample to be tested several loads shall be taken. For properties for which testing of aggregate is permitted, sampling shall be carried out in accordance with EN Sampling increments consisting of individual pieces of armourstone shall be taken from the batch to be tested and may dn taken from the samples which have been taken for the determination of the particle size or mass distribution.
Sampling increments shall be selected by one of the following methods: If individual pieces of armourstone are significantly larger than the minimum size or mass required for the test s to be executed, a portion of appropriate size or mass may be obtained by breaking a representative piece. The objective is to obtain laboratory samples representative of the batch to be tested but to have carried sample reduction at source so as to minimize transport costs and reduce unnecessary sample reduction at the 133832 laboratory.
If a sampling increment of a coarse grading is too large as test portion, one of the procedures as described in 4. If a sampling increment of a light grading is too large for the preparation of the bulk sample, the procedure as specified in 4. If a sampling increment of a heavy grading is too large for the preparation of the bulk sample, the procedure as specified in 4.
When 13383–2 a sample from a grab, catch all the material from one symmetrical quarter or half of the grab content in one or more buckets. 31383-2 further reduction is required, tip the bucket s containing the reduced sample over two adjoining buckets and discard the contents of one bucket. Repeat this procedure until the required size of test portion eb obtained.
The distance between two parallel set plates shall be at least three times the sieve size of the nominal upper grading limit.
When discharging a sample from a loader bucket, take all the material from a cross-sectional segment or from one side of an imaginary cross-sectional plane in the centre of the loader bucket, 13383- between two parallel and vertically set plates or at one side of a vertically set plate.
When discharging a sample from a grab, take all the material from one symmetrical quarter or half of the grab content, discharged between two vertically set plates at right angles to each other or at one side of a vertically set plate. When reducing a sample already discharged onto a floor area 4. For the reduction of a sample to approximately the half amount, stretch a wire as a separation line over the sample.
133383-2 segregation is present in one direction of the deposited sample, place the wire in the same direction see Figure 2 and take the subsample by removing all armourstone located, or for the largest part located, at one side of the imagined vertical plane projected by the wire. Where segregation is present in one direction of the deposited sample, place the wires in the same direction see Figure 3 and take the subsample by removing all stones located, or for the largest part located, between the imaginary vertical planes projected by the wires.
To facilitate the reduction procedure a sample to 13833-2 reduced by using wires may be spread in a layer of thickness not greater than twice the nominal upper size of the 1383-2. Where no segregation of the material has occurred, the subsample may be limited 133883-2 half the separated strip.
Each piece of armourstone shall be marked clearly and durably with the allocated number. The subsample shall be 133832- by randomly selecting numbered pieces of armourstone until the required size of test portion is obtained.
The crushing shall be carried out with a laboratory jaw crusher. Laboratory samples shall be transported in such a way that pieces of armourstone are not broken in transit. The sampling report shall refer to this part of this European Standard and state: The aperture sizes and the number of sieves shall be appropriate for the nature of the sample and 1383-2 accuracy required.
The cumulative mass of the pieces 133383-2 armourstone passing each sieve shall be expressed as a percentage of the total mass of the material. Alternatively, for mm, 90 mm and 63 mm square openings, perforated steel plate sieves. In all cases the 63 mm sieve shall be used. Perforated steel plate sieves shall be in accordance with EN The floor shall be sufficiently clean and close-textured to be able to distinguish and recover the material of 1333-2 test portion from the floor material.
The mass of the test portion in kilograms shall be at least twice the nominal upper limit of the grading in millimetres. Pass the sample in successive parts over the sieves in order of increasing sieve size, starting with the 63 mm sieve up to and including the mm sieve. Place the mm sieve over the stones retained on the mm sieve.