EN 16306:2013

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prüfverfahren für Naturstein - Bestimmungen der Beständigkeit von Marmor bei zyklischer Belastung mit Wärme und FeuchtigkeitMéthodes d'essai pour pierres naturelles - Détermination de la résistance du marbre aux cycles thermiques et d'humiditéNatural stone test methods - Determination of resistance of marble to thermal and moisture cycles91.100.15Mineralni materiali in izdelkiMineral materials and productsICS:Ta slovenski standard je istoveten z:EN 16306:2013SIST EN 16306:2013en,fr,de01-december-2013SIST EN 16306:2013SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16306
February 2013 ICS 73.020; 91.100.15 English Version
Natural stone test methods - Determination of resistance of marble to thermal and moisture cycles
Méthodes d'essai pour pierres naturelles - Détermination de la résistance du marbre aux cycles thermiques et d'humidité
Prüfverfahren für Naturstein - Bestimmungen der Beständigkeit von Marmor bei zyklischer Belastung mit Wärme und Feuchtigkeit This European Standard was approved by CEN on 7 December 2012.
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.
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Guidance on limit values . 13 A.1 General . 13 A.2 Flexural strength . 13 Annex B (informative)
Non-destructive testing . 14 B.1 General . 14 B.2 Ultrasonic velocity . 14 B.3 Modulus of elasticity . 15 Annex C (informative)
Enhanced petrographic analysis . 16 C.1 General . 16 Bibliography. 18
For scientific definition of marble, reference is made to EN 12670:2001, Terminology: 2.1.243 a. NOTE Bowing and rapid strength loss is known to occur in some marbles when used as exterior claddings. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12372, Natural stone test methods – Determination of flexural strength under concentrated load EN 12670:2001, Natural stone – Terminology EN 13161, Natural stone test methods – Determination of flexural strength under constant moment EN 14146, Natural stone test methods – Determination of the dynamic modulus of elasticity (by measuring the fundamental resonance frequency) EN 14579, Natural stone test methods – Determination of sound speed propagation EN ISO 4892-1:2000, Plastics - Methods of exposure to laboratory light sources - Part 1: General guidance (ISO 4892-1:1999) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 bowing change in shape from flat and planar to a curved or dished shape in a convex or concave direction Note 1 to entry: Other terms commonly used for the same phenomenon are dishing and warping. Convex bowing is quantified by positive values, concave bowing by negative values. 3.2 convex centre part of the specimen is bowing upwards, away from the moist substratum 3.3 concave centre part of the specimen is bowing downwards, against the moist substratum 4 Principle Bowing is measured on test samples exposed to moisture from beneath and heating from above. The temperature interval is from 20°C to 80°C, one cycle completed each 24 h. The 80 ºC is measured on a black reference, placed on the surface of one specimen to control the climate of the chamber/bath. SIST EN 16306:2013

T temperature H0 initial height of the specimen at the measuring point [mm] H difference between the initial height and the height after a given cycle [mm] HN the normalised height difference, related to LN = 1 m [mm] B HN / LN = the normalised bowing value [mm/m] Bn bow values after n cycles [mm/m] L distance between the supports under the specimen = 0,35 [m] LN
normalised length = 1 [m] 6 Apparatus 6.1 A non-corrosive bath (Figure 1) of sufficient capacity to hold the required number of specimens. The container must be designed in a way that specimens receive continuous moisture from one side and are exposed to cyclic heating on the other side. The container shall be furnished with a device that ensures a constant water level during the cycling. Lying on the bottom of the container is a grating, which is covered by a sheet of heat stable filter cloth.
6.2 A non-corrosive grating that fits the length and width of the container and has a height of at least 1 cm. The function of the grating is to ensure a water reservoir beneath the filter cloth. 6.3 A soft, heat and dimension stable non-hygroscopic needle filter cloth of thickness approximately 5 mm and without any water soluble substances or chemicals. The cloth (e.g. polyester or PTFE (polytetrafluoroethylene) needle felt) is to be placed on top of the grating. The function of the cloth is to provide moisture and a uniform support to the specimen. 6.4 Heating panels of sufficient sizes/and numbers to cover the container. The panels must be capable of providing a uniform heat flow, heating the black reference from 20 °C to 80 °C at average rate of (0,30 ± 0,05) °C per minute. The maximum allowed temperature difference within the bath, during heating exposure, is 3 °C. Walls of insulating material should preferably be placed around the container (Figure 1) to avoid unwanted cooling or air circulation. Before the system is taken into use, trial measurements of the temperature shall be performed at nine surface points widely distributed within the heating frame (Figure 2). The temperature is measured on a uniform surface preferably with an infrared thermometer or a surface measuring thermometer. The temperature readings shall be taken on the surface of the black reference. NOTE 1 The heating rate may be adjusted by changing the distance between the heating device and the samples, or by controlling the effect of the heater. The heating curve is displayed in Figure 5.
6.5 A black reference plate, according to EN ISO 4892-1:2000 (Figure 3), to establish the maximum surface temperature at 80°C. The black reference is connected by a thermocouple (cable type K), preferably to a high stability temperature and process controllers. A simple logger is also possible. NOTE 2 The black reference is placed on the surface of the measured sample, preferably in the middle of the container. The temperature for the experimental exposure is programmed in advance. The heating elements are connected to the whole system and are controlled by the process controller. The temperature of the black reference is SIST EN 16306:2013
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