EN 12326-2:2011

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Skrilavec in izdelki iz naravnega kamna za polaganje streh in zidov - 2. del: Preskusne metode za skrilavce in karbonatne skrilavceSchiefer und Naturstein für überlappende Dachdeckungen und Außenwandbekleidungen - Teil 2: Prüfverfahren für Schiefer und carbonathaltige SchieferArdoises et pierres pour toiture et bardage extérieur pour pose en discontinu - Partie 2: Méthodes d’essais pour ardoises et ardoises carbonatéesSlate and stone for discontinuous roofing and external cladding - Part 2: Methods of test for slate and carbonate slate91.100.15Mineralni materiali in izdelkiMineral materials and productsICS:Ta slovenski standard je istoveten z:EN 12326-2:2011SIST EN 12326-2:2011en,fr01-oktober-2011SIST EN 12326-2:2011SLOVENSKI
STANDARDSIST EN 12326-2:2000/A1:2004SIST EN 12326-2:20001DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12326-2
June 2011 ICS 91.100.15 Supersedes EN 12326-2:2000English Version
Slate and stone for discontinuous roofing and external cladding -Part 2: Methods of test for slate and carbonate slate
Ardoises et pierres pour toiture et bardage extérieur pour pose en discontinu - Partie 2: Méthodes d'essais pour ardoises et ardoises carbonatées
Schiefer und Naturstein für überlappende Dachdeckungen und Außenwandbekleidungen - Teil 2: Prüfverfahren für Schiefer und carbonathaltige Schiefer This European Standard was approved by CEN on 19 May 2011.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12326-2:2011: ESIST EN 12326-2:2011

Petrographic interpretation . 42A.1Connection between the micas (Figure A.1 (a) and (b)) . 42A.2Bedding and cleavage, angle of intersection (Figures A.1 (c) to (q)) . 42Annex B (informative)
Petrographic examination of origin and identification of slate . 44B.1Identification of slate . 44B.2Origin . 44B.3Report . 45Bibliography . 46 SIST EN 12326-2:2011

mg mnc mass of a powdered test piece for non-carbonate carbon in the determination of apparent calcium carbonate content by the conductivity of sodium hydroxide mg ms mass of calcium carbonate used in the determination of apparent calcium carbonate content by conductivity of sodium hydroxide mg mw wet mass of a test piece in the water absorption test g m1 total carbon content in the determination of apparent calcium carbonate content by catalytic thermal decomposition
% m2 content of non-carbonate carbon in the determination of apparent calcium carbonate content by catalytic thermal decomposition
% m3 content of carbonate carbon in the determination of apparent calcium carbonate content by catalytic thermal decomposition % n number of slates subject to a test - Pi failure load of individual slates in the bending strength test N rd individual measurements of the deviation of a slate from a rectangle mm rdmax maximum deviation of a slate from a rectangle mm Rd deviation of a test slate from a rectangle as a percentage of its length % R Ri modulus of rupture of test slates N/mm2 R sample mean modulus of rupture of test slates N/mm2 Rl sample mean modulus of rupture of test slates measured in the longitudinal orientation N/mm2 Rt sample mean modulus of rupture of test slates measured in the transverse orientation N/mm2 Rc characteristic modulus of rupture of test slates N/mm2 R1 sample mean modulus of rupture of the control test pieces in the freeze-thaw test N/mm2 SIST EN 12326-2:2011

4 Surveillance sampling procedure Sampling shall be carried out by selecting slates from each lot separately in a random way so that every slate has an equal chance of being selected. Selected slates shall be marked so as to identify which lot they came from. Table 1 indicates the number of slates required for each test. In the case of disputes test slates need only be taken for those tests which are in doubt. SIST EN 12326-2:2011

Each bar shall have one edge which shall not deviate from a straight edge by more than ± 0,1 mm. 5.3 Preparation of test pieces Whole slates are used and do not need any preparation unless any corners are oversized within 50 mm of the corner. In this case remove the over size corner(s) at an angle of approximately 45° from a point 50 mm from the corner, using a suitable cutting tool. 5.4 Procedure Place the slate with the chamfered edge facing down. Align the straight edges of the two steel bars along the long edges of the slate. Using a steel rule find the midpoints of the length of the slate on each side to the nearest 1,0 mm at each end and mark the positions on the slate. Place the steel rule across the distance between the bars at the marked points. Read off and record the width to the nearest 1,0 mm. Repeat for the length. 5.5 Expression of the results Calculate the difference of the length from the specified length as a percentage. Calculate the difference of the width from the specified width as a percentage. 5.6 Test report Report the length and width in millimetres and the deviation in percentage from the specified length and width. The test report shall also include the identification of the product, reference to this method and the identifier of this European Standard, i.e. EN 12326-2:2011. 6 Determination of the amount by which the edges deviate from a straight edge 6.1 Principle The deviation of the long edges of slates from a straight edge is measured using a steel rule. For slates
500 mm long or longer the deviation is calculated as a percentage of the length. 6.2 Apparatus 6.2.1 A steel rule capable of reading to 0,5 mm. 6.2.2 A steel bar longer and thicker than the slates under test with one edge which shall not deviate from a straight edge by more than ± 0,1 mm. SIST EN 12326-2:2011

50 mm from the corner, using a suitable cutting tool. 6.4 Procedure Place the slate with the chamfered edge facing down and position the straight edge of the steel bar alongside one edge of the slate. Using the steel rule measure the maximum deviation (Sd1) of the edge of the slate from the steel bar to the nearest 0,5 mm. Ignore small deviations and flaking resulting from the dressing of the edges (Figure 1). Repeat and record the deviation for the other edge (Sd2).
Key 1 deviation from a straight edge 2 acceptable minor deviations and flaking Figure 1 — Illustration of acceptable small variations and flaking resulting from the dressing of the edges of slates. The chamfer is shown facing upwards. Measure the length of the slate (ls) by the method given in Clause 5. 6.5 Expression of the results For slates of 500 mm or longer and for each edge calculate the percentage deviation from a straight edge (Sd) using the equation: sd100sdxlS×= where
Sdx
is the deviation for each edge, sd1 and sd2 in millimetres; ls
is the length of the slate in millimetres. 6.6 Test report For slates less than 500 mm long report for each edge the deviation in mm from a straight edge. SIST EN 12326-2:2011

= tan α × 100 SIST EN 12326-2:2011

is the maximum angle measured in 7.4. 7.6 Test report Report the maximum percent deviation. The test report shall also include the identification of the product, reference to this method and the identifier of this European Standard, i.e. EN 12326-2:2011. 8 Determination of the thickness of individual slates 8.1 Principle The thickness of individual slates is measured at four points using a micrometer, or similar equipment. The thickness is expressed as the mean of the four readings. 8.2 Apparatus Dial gauge, micrometer or similar equipment capable of measuring thickness to 0,05 mm with a contact area of 5 mm to 10 mm diameter. 8.3 Preparation of test pieces Whole slates are used. They do not require any preparation. 8.4 Procedure Measure the thickness of the slate to 0,1 mm at four points avoiding all dressed edges and any localised thick or thin areas. NOTE Figure 2 indicates the approximate points of measurement for various slate shapes. SIST EN 12326-2:2011

Key
perimeter zone of the slate (width 25 mm) excluded from thickness measurements.
point of measurement recommended (25 mm to 30 mm from edge)
Right
Left Figure 2 — Approximate positions for measurements of individual thickness 8.5 Expression of results Calculate the mean of the four measurements and, using the largest individual value, the maximum deviation from the mean thickness (Ed) as a percentage to two significant figures using the equation: 100maxd×−=eeeE where emax is the maximum individual thickness measurement in millimetres; eis the mean thickness in millimetres. SIST EN 12326-2:2011

Key 1 dial gauge 2 test slate in position with maximum curvature under gauge Convex side upwards Figure 3 — Typical apparatus for measuring the deviation from flatness SIST EN 12326-2:2011

9.2.2 The apparatus described in 5.2.
Key 1 line of high points 2 convex face 3 concave face 4 line of low points Figure 4 — Approximate measurement positions in the determination of deviation from flatness 9.3 Preparation of test pieces Individual slates are used but they do not need any preparation. 9.4 Procedure Lay the slate convex face uppermost on the surface plate of the test apparatus and move the dial gauge over the highest point on the slate. Record the height of the slate surface in millimetres at three positions equally spaced along the high point of the curvature (Figure 4). Turn the slate over without disturbing the position of the dial gauge and repeat the measurements at the same three positions. Measure the length of the slate (ls) to the nearest 1 mm using the method described in Clause 5. 9.5 Expression of results Calculate the mean of the first three readings (f1) and the mean of the second three readings (f2). Calculate the deviation from flatness (fd) using the equation: fd = f2 - f1 Calculate the percentage deviation from flatness (Fd) using the equation: sdd100lfF×= where fd
is the deviation from flatness in millimetres; SIST EN 12326-2:2011

is the slate length in millimetres. 9.6 Test report Report the percentage deviation from flatness to the nearest 0,1 %. The test report shall also include the identification of the product, reference to this method and the identifier of this European Standard, i.e. EN 12326-2:2011. 10 Determination of the modulus of rupture, and characteristic modulus of rupture 10.1 Principle Tests are carried out on prepared test pieces to measure the failure load in bending. From the results the modulus of rupture and the characteristic modulus of rupture are calculated. 10.2 Apparatus 10.2.1 A three point bending test machine, capable of applying a constant rate of loading. The support bars and load bar shall have a diameter of 20 mm and the load bar and any two of the load and support bars shall be free to align themselves to the test piece. The load bar shall be parallel to the support bars. The support bars shall be (180 ± 1,0) mm apart and the load bar shall be central over the span. NOTE Where an apparatus capable of applying a constant rate of loading is not available a constant rate of deflection is acceptable. 10.2.2 Oven, ventilated and capable of maintaining a temperature of (110 ± 5) °C. 10.2.3 Water cooled diamond saw. 10.2.4 Metal rule or similar equipment, capable of measurements to 1 mm. 10.2.5 Micrometer or similar equipment, capable of measuring thickness to 0,05 mm with a contact area of 5 mm to 10 mm diameter. 10.3 Preparation of test pieces Determine the number of test pieces required by reference to Clause 4 but using not less than 20 for each orientation (Figure 5). Using a water cooled diamond saw cut from each slate one test piece parallel (longitudinal) to the long edge and measuring (125 ± 1,0) mm by the length of the slate (minimum 190 mm), and one test piece perpendicular (transverse) to the long edge and measuring (125 ± 1,0) mm by the width of the slate (minimum 190 mm). Make the saw cuts so that they avoid the dressed edges of the slates and trim off the ends with the saw. If the slates are too small to cut test pieces for each orientation from one slate, two slates shall be used. Dry the test pieces in the oven at (110 ± 5) °C for (17 ± 2) h and then allow them to cool to ambient temperature. SIST EN 12326-2:2011

Key 1 slate 2 test piece 3 orientation of the load bar in the test 4 perpendicu
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