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BS EN 13450:2013

$167.15

Aggregates for railway ballast

Published By Publication Date Number of Pages
BSI 2013 38
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This European Standard specifies the properties of aggregates obtained by processing natural, manufactured or recycled crushed unbound aggregates for use in construction of the upper layer of railway track. For the purposes of this standard, the aggregate is referred to as railway ballast.

A list of the source materials that have been considered and are within the scope of this European Standard is given in Annex E (normative).

NOTE Reused railway ballast: railway ballast resulting of previously used railway ballast on site and without putting it on the market is not covered by this European Standard.

It also specifies that a quality control system is in place for use in factory production control and it provides for the evaluation of conformity of the products to this European Standard.

It incorporates a general requirement that railway ballast should not release any dangerous substances in excess of the maximum permitted levels specified in a relevant European Standard for the material or permitted in the national regulations of the member state of destination.

Railway ballast used in construction should comply with all the requirements of this European Standard. The standard includes comprehensive and specific requirements for natural aggregates and recycled ballast, dealing with, for example, the stability of certain basalts.

For materials from some other secondary sources, however, work is ongoing and the requirements are incomplete. In the meantime such materials, when placed on the market as railway ballast, should conform fully to this standard but may also be required to conform to specific relevant additional requirements at the place of use. Additional characteristics and requirements may be specified on a case by case basis depending upon experience of use of the product, and defined in specific contractual documents.

Requirements for the declaration of the potential of railway ballast to release regulated dangerous substances are currently under development. Until such time as these are finalised, attention should be paid to requirements at the place of use.

PDF Catalog

PDF Pages PDF Title
4 Contents page
5 Foreword
7 1 Scope
2 Normative references
8 3 Terms and definitions
9 4 Geometrical requirements
4.1 General
4.2 Railway ballast size
4.3 Grading
10 4.4 Content of fine particles
4.5 Fines content
11 4.6 Particle shape – Flakiness index and shape index
12 4.7 Particle length
5 Physical requirements
5.1 General
5.2 Resistance to fragmentation
5.2.1 Los Angeles
13 5.2.2 Resistance to impact
14 5.3 Resistance to wear
5.4 Particle density and water absorption
5.4.1 Particle density
5.4.2 Water absorption
6 Chemical requirements
6.1 General
6.2 Petrographic description
15 7 Durability
7.1 General
7.2 Magnesium sulfate soundness
7.3 Freeze-thaw resistance
7.3.1 Water absorption as a screening test for freeze-thaw resistance
7.3.2 Resistance to freezing and thawing
16 7.3.3 Resistance to freezing and thawing in the presence of salt (extreme conditions)
7.4 Electrical conductivity
17 7.5 Sonnenbrand
8 Evaluation of conformity
9 Designation
9.1 Designation and description
18 9.2 Additional information for the description of railway ballast
10 Marking and labelling
19 Annex A (informative) Sampling railway ballast at the construction site either from a railway wagon or from the track
A.1 Introduction
A.2 Sampling railway ballast from a railway wagon
A.3 Sampling railway ballast from track without use of a steel frame
20 A.4 Sampling railway ballast from track using a steel frame
Key
23 Annex B (informative) Guidance on interpretation of results when samples of railway ballast have been taken from railway wagon or from track
24 Annex C (normative) Conditions to be applied to the test procedure specified in EN 1367-2 for the determination of the resistance of railway ballast to the magnesium sulfate test (see 7.2)
C.1 General
C.2 Apparatus
C.3 Reagents
C.4 Preparation of test specimens
C.5 Procedure
25 C.6 Calculation and expression of results
C.7 Test report
26 Annex D (normative) Conditions to be applied to the test procedure specified in EN 1367-1 for determination of the resistance to freezing and thawing of railway ballast (see 7.3.2)
D.1 General
D.2 Exposure to freezing under water
D.3 Test report
27 Annex E (normative) Source materials considered in the development of EN 13450 and their status in respect of the scope of this standard
28 Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU Construction Products Directive
35 Bibliography
BS EN 13450:2013
$167.15