GB/T 13477.13-2019Test Method for Building Sealants -- Part 13: Determination of Adhesion/cohesion Properties at Variable Temperatures (English PDF)

Foreword

GB/T 13477 Test Method for Building Sealants is divided into the following parts:

---Part 1: Specifications for Test Substrates;

---Part 2: Determination of Density;

---Part 3: Determination of Extrudability of Sealants Using Standardized Apparatus;

---Part 4: Determination of Extrudability of One-component Sealants;

---Part 5: Determination for Tack-free Time;

---Part 6: Determination of Flow;

---Part 7: Determination of Low-temperature Flexibility;

---Part 8: Determination of Tensile Properties;

---Part 9: Determination of Adhesion/cohesion Properties after Immersion in Water;

---Part 10: Determination of Tensile Properties at Maintained Extension;

---Part 11: Determination of Tensile Properties at Maintained Extension after

Immersion in Water;

---Part 12: Determination of Adhesion/cohesion Properties at Constant

Temperature;

---Part 13: Determination of Adhesion/cohesion Properties at Variable

Temperatures;

---Part 14: Determination of Resistance to Prolonged Exposure to Water;

---Part 15: Determination of Adhesion/cohesion Properties after Exposure to Heat

and Artificial Light through Glass and to Water;

---Part 16: Determination of Resistance to Compression;

---Part 17: Determination of Elastic Recovery;

---Part 18: Determination of Adhesion-in-peel;

---Part 19: Determination of Change in Mass and Volume;

---Part 20: Determination of Staining.

Test Method for Building Sealants - Part 13:

Determination of Adhesion/cohesion Properties at

Variable Temperatures

1 Scope

This Part of GB/T 13477 stipulates the terms and definitions, principle, standard test

conditions, test apparatuses and materials, specimen preparation, specimen

processing, test procedures and test report of the determination of adhesion/cohesion

properties of sealants for the purposes of architecture and civil engineering after

stretch-compression cycle at variable temperatures.

This Part is applicable to the determination of adhesion/cohesion properties of elastic

sealants for the purposes of architecture and civil engineering after repeated cooling

stretch - heating compression.

2 Normative References

The following documents are indispensable to the application of this document. In

terms of references with a specified date, only versions with a specified date are

applicable to this document. In terms of references without a specified date, the latest

version (including all the modifications) is applicable to this document.

GB/T 13477.1 Test Method for Building Sealants - Part 1: Specifications for Test

Substrates (GB/T 13477.1-2002, ISO 13640:1999, MOD)

GB/T 14682 Building Sealing Material Vocabulary (GB/T 14682-2006, ISO 6927:1981,

NEQ)

3 Terms and Definitions

Terms and definitions that are defined in GB/T 14682 are applicable to this document.

4 Principle

Bond sealant sample between the surface of two parallel substrates to make the test

specimen. After the test specimen goes through cooling stretch - heating compression

cycle under the stipulated conditions, examine the damage of the adhesion or cohesion

of the test specimen.

5 Standard Test Conditions

Standard test conditions are: temperature (23 +/- 2) °C; relative humidity (50 +/- 5) %.

6 Test Apparatuses and Materials

7 Preparation of Test Specimen

Before the test, sealant sample and substrate to be tested shall be placed under the

standard test conditions for at least 24 h.

Use absorbent gauze to eliminate floating ash on the surface of the cement mortar

board. Use solvents, for example, acetone, to rinse the aluminum plate and the glass

plate, then, dry them.

In accordance with sealant manufacturer's instructions (for example: whether primer

has been used; the mixing program of multi-component sealant), prepare the test

specimen. In terms of the same type of substrate, prepare 3 test specimens.

As it is shown in Figure 1 and Figure 2, on anti-stick material, assemble two

adhesion/cohesion substrates and two isolation pads into a cavity. Then, embed the

sealant sample into the cavity. Thus, test specimen is made. During sample embedding,

pay attention to the following matters:

a) Avoid forming bubbles;

b) Extrude sample on the adhesion/cohesion surface of the substrate; the

adhesion/cohesion shall be dense;

c) Trim the surface of the sample, so that it is on the same level as the upper

surface of the substrate and the isolation pad.

Place the test specimen in side lay. Eliminate the anti-stick material as soon as possible,

so that the sample can be thoroughly cured or completely dried. During the

maintenance period, maintain the isolation pad in its original position.

8 Processing of Test Specimen