ISO 13638:2021 Building and civil engineering sealants — Determination of resistance to prolonged exposure to water

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Building and civil engineering sealants — Determination of resistance to prolonged exposure to water是ISO于2021-03-10发布的ISO标准，适用于世界范围。

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INTERNATIONAL STANDARD ISO 13638:2021

Building and civil engineering sealants — Determination of resistance to prolonged exposure to water

1 Scope

This document specifies a method for the determination of the ability of sealants to resist differing degrees of exposure to water under conditions of service.

The method assesses the effects of water immersion, for specified durations of time, on the ability of the sealant to fulfil its essential functions, principally to withstand joint movement.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 6927, Buildings and civil engineering works — Sealants — Vocabulary

ISO 9046, Building construction — Jointing products — Determination of adhesion/cohesion properties of sealants at constant temperature

ISO 9047, Building construction — Jointing products — Determination of adhesion/cohesion properties of sealants at variable temperatures

ISO 11600, Building construction — Jointing products — Classification and requirements for sealants

ISO 13640, Buildings and civil engineering works — Sealants — Specifications for test substrates

3 Terms a nd definiti ons

For the purposes of this document, the terms and definitions given in ISO 6927 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

— IEC Electropedia: available at http://www.electropedia.org/

4 Principle

Test specimens are prepared in which the sealant to be tested adheres to two parallel contact surfaces. After immersion of the test specimens in water under defined conditions, they are subjected to repeated extension and compression movements in a suitable device, at an amplitude which is 50 % of that used in the test to assess the respective movement accommodation factor. This procedure is repeated a number of times, or until failure of one or more test specimens is observed. The number of repetitions of water immersion followed by extension/compression movement is related to the expected water resistance in service.

Water immersion may be carried out either at ambient temperature (23 °C), or at elevated temperature (40 °C or 50 °C) to accelerate the influence of the exposure to water.

ISO 13638:2021

5 Apparatus

5.1 Substrate materials, used for the preparation of test specimens, which shall be as defined in ISO 13640. The substrate materials shall be selected from mortar and/or anodized aluminium and/or glass. Other substrate materials may be used as agreed by the parties concerned.

For each test specimen, two substrate pieces of the same material are required with a cross section of dimensions as shown in Figures 1 and 2. Test substrates of other dimensions may be used, but then the dimensions of the sealant bead and the area of adhesion shall be the same as those shown in Figures 1 and 2.

5.2 Spacers, of cross section (12 mm × 12 mm), with anti-adherent surfaces, for the preparation of the test specimens (see Figures 1 and 2).

5.3 Anti-adherent substrate, for the preparation of test specimens, for example, polytetrafluoroethylene (PTFE) or polyethylene (PE) film, preferably according to the advice of the sealant manufacturer.

5.4 Ventilated convection-type oven, capable of being maintained at (70 ± 2) °C, for conditioning according to method B (see 7.3).

5.5 Container, for immersing test specimens in distilled water (conditioning method B).

5.6 Container with heating device, of not less than 10 litre capacity, for immersing the test specimens in water maintained at (23 ± 2) °C, (40 ± 2) °C or (50 ± 2) °C.

5.7 Test machine with a recording device, capable of executing extension/compression cycles and extension at a rate of (5,5 ± 0,5) mm/min.

5.8 Separators for extension, of appropriate dimensions to hold the test specimens extended to 6,25 %, 10 % or 12,5 % of the original width or any other width agreed between the parties concerned.

5.9 Clamps for compression, capable of holding the specimens at a compression of 6,25 %, 10 % or 12,5 % of the original width, or any other compression agreed between the parties concerned.

5.10 Measuring device, scaled in intervals of 0,5 mm.

6 Preparation of test specimens

Condition the substrate material and supplies of the sealant in the original closed container(s) for a minimum of 16 h at (23 ± 2) °C and (50 ± 10) % relative humidity. Prepare five test specimens for each substrate material to be used at the same time.

Assemble for each test specimen, two substrates (5.1) and two spacers (5.2) according to Figures 1 and 2 and place them on the anti-adherent substrate (5.3).

Follow the instructions of the sealant manufacturer concerning, for instance, whether a primer is to be used and the mixing procedure for multi-component sealants.

Fill the hollow volume formed by the substrates and spacers with the sealant. Take the following precautions:

a) avoid the formation of air bubbles;

b) press the sealant on the inner surfaces of the substrates;

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