JG/T 157-2009Putty for exterior wall (English PDF)

Foreword

This standard replaces JG/T 157-2004 "Putty for exterior wall".

This standard is a revision of JG/T 157-2004 "Putty for exterior wall". As

compared with JG/T 157-2004, the main changes are as follows.

- For the scope of application of this standard, EXTEND the ordinary leveling

putty for exterior wall to the putty used as the coating's bottom layer of

ordinary exterior wall and exterior wall thermal insulation.

- CHANGE the asbestos-cement board for testing purposes to non-asbestos

fiber-cement board.

- CHANGE the classification from the original ordinary type (P type), flexible

(R type) to three categories. ordinary type (P), flexible type (R), elastic type

(T).

- CHANGE the putty flexible test method from the original single dynamic

resistance to cracking to two types. the putty film flexibility and the dynamic

resistance to cracking.

- CHANGE the initial resistance to dry-cracking to two types. thick-applied

putty (product which has a single-pass thickness of more than 1.5 mm) and

thinly-applied putty (product which has a single-pass thickness of not more

than 1.5 mm).

- For the elastic (T) putty, CANCEL the technical indicators of rubbing

properties.

- CHANGE the accuracy of the balance for water absorption test from 0.1 g

to 0.01 g.

- IMPROVE the test method for the dynamic resistance to cracking.

- CHANGE the low-temperature stability method to "PLACE it at -5 °C for 18

h, PLACE it at standard conditions for 6 h, three cycles".

Appendix A and Appendix B of this standard are normative appendixes.

This standard was proposed by the Institute of Standardization of the Ministry

of Housing and Urban-Rural Development.

This standard shall be under the jurisdiction of the Technical Jurisdiction

Organization of Building Engineering Standard of the Ministry of Housing and

Urban-Rural Development.

Putty for exterior wall

1 Scope

This standard specifies the requirements, test methods, inspection rules and

markings, packaging and storage of putty for exterior walls of buildings.

This standard is applicable to the putty for exterior wall made of cement,

polymer powder, synthetic resin emulsion and other materials as the main

binder, added with fillers, additives, etc., for the paint's bottom layer of the

ordinary exterior wall and exterior wall thermal insulation.

2 Normative references

The provisions in following documents become the provisions of this standard

through reference in this standard. For the dated references, the subsequent

amendments (excluding corrections) or revisions do not apply to this standard;

however, parties who reach an agreement based on this standard are

encouraged to study if the latest versions of these documents are applicable.

For undated references, the latest edition of the referenced document applies.

GB 175 Portland cement and ordinary Portland cement

GB/T 1728 Methods of test for drying time of coatings of paints and putties

GB/T 1733 Determination of resistance to water of films

GB/T 1748 Method of test for flexibility of putty coatings

GB/T 3186 Paints varnishes and raw materials for paints and varnishes -

Sampling

GB/T 6682 Water for analytical laboratory use - Specification and test

methods

GB/T 8170 Rules of rounding off for numerical values & expression and

judgement of limiting values

GB/T 9265 Determination for alkali resistance of film of - Architectural paints

and coatings

GB/T 9268-2008 Determination of freeze-thaw resistance of latex and

emulsion paints

GB/T 9271 Paints and varnishes standard panels for testing

GB/T 9278 Temperature and humidity for conditioning and testing of paint

specimens

GB/T 9750 Marks for package of coating products

GB/T 13491 General rule for packing of coatings

JC/T 412.1-2006 Fiber cement flat sheets - Part 1. Non-asbestos fiber

cement flat sheets

JG/T 24-2001 Sand textured building coating based on synthetic resin

emulsion

JG/T 25-1999 Determination for freeze-thaw resistance of film of building

coatings

JGJ 52 Standard for technical requirements and test method of sand and

crushed stone (or gravel) for ordinary concrete

3 Terms and definitions

The following terms and definitions apply to this standard.

3.1

Putty for exterior wall

Before the finishing work, the surface treatment material of the base layer

which is applied to the exterior wall of the building, for the main purposes of

leveling and cracking resistance.

3.2

Dynamic resistance to cracking

The ability of the surface material to resist crack propagation in the base

layer.

3.3

Thinly-applied putty

An exterior wall putty which has a single-pass thickness of less than or equal

to 1.5 mm.

3.4

Thick-applied putty

An exterior wall putty which has a single-pass thickness of more than 1.5

mm.

4 Classification and marking

5 Requirements

Technical indicators shall meet the requirements of Table 1.

Characteristic type. ordinary type P; flexible type R; elastic type T

Name code. WNZ, putty for exterior wall

same method to apply the second pass of specimen, about 1 mm thickness,

check again whether there is barrier during coating work. When all the coating

is flat and free from pinholes or curling, it is considered to be "barrier-free during

coating".

7 Inspection rules

23 °C ± 2 °C, relative humidity 50% ± 5%.

A.2 Test equipment

A.2.1 Balance. accuracy 0.01 g;

A.2.2 Sink;

A.2.3 Triangular bracket;

A.2.4 Medium-speed qualitative filter paper. diameter 12.5 cm;

A.2.5 Steel ruler. accuracy 1 mm;

A.2.6 Stopwatch.

A.3 Test methods

A.3.1 Fully apply the specimen onto the 70 mm x 70 mm x 20 mm mortar block

as described in clause 6.3.2, control the wet film thickness at 2 mm, make its

surface flat and free from air bubble. After curing it in standard environment for

7 d, use the 1.1 mixture of rosin and paraffin to immerse and coat the 4 side

surfaces and the bottom surface of the test block, the coating shall be uniform

and free from holiday or contamination to putty surface, it shall ensure the

length of each side of the test surface is not less than 64 mm, place it in

standard environment for 1 d. Prepare 5 blocks of specimens simultaneously

from each sample.

A.3.2 Test procedure

Use medical gauze to remove the surface ash from the putty layer's surface,

weigh the test block's mass W0. As shown in Figure 1, put the test block such

that the putty surface faces downwards, hold it on two triangular brackets in the

sink, let the bracket be in linear contact to the putty layer. Maintain the test block

horizontally, add distilled water (complying with the grade III water requirements

in GB/T 6682), use the gauge to control the test block's immersion-depth at 15

mm. After timekeeping for 10 min, take the test block out of water, use a piece

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