Construction gypsum GOST 125 79. Gypsum binders. Technical conditions. Acceptance rules and test methods
UDC 691.55:006.354
Group Zh12
INTERSTATE STANDARD
GYPSUM BINDERS
Technicalconditions
Gypsum binders. Specifications
Date of introduction 07/01/80
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Construction Materials Industry of the USSR
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated July 19, 1979 No. 123
3. INSTEAD GOST 125-70, GOST 5.1845-73
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
5. REPUBLICATION. October 2002
This standard applies to gypsum binders obtained by heat treatment of gypsum raw materials to calcium sulfate hemihydrate and used for the manufacture of construction products of all types and in the production construction work, as well as for the manufacture of molds and models in porcelain, earthenware, ceramics and other industries.
The standard complies with the requirements of the standard ST SEV 826-77 in the part specified in Appendix 2.
Requirements for medical gypsum must be established by the appropriate regulatory and technical document developed on the basis of ST SEV 826-77.
1. TECHNICAL REQUIREMENTS
1.1. Binders must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the manner established by the manufacturer's ministry.
For the production of binders, gypsum stone is used in accordance with GOST 4013 or phosphogypsum in accordance with the current regulatory and technical documentation.
1.3. Depending on the compressive strength, the following grades of binders are distinguished: G-2, G-3, G-4, G-5, G-6, G-7, G-10, G-13, G-16, G- 19, G-22, G-25.
The minimum tensile strength of the binder for each brand of binder must correspond to the values given in table. 1.
Table 1
|
Binder grade |
Tensile strength of beam samples with dimensions 40x40x160 mm at the age of 2 hours, MPa (kgf/cm2), not less |
|
|
when compressed |
when bending |
|
1.4. Depending on the setting time, the types of binders listed in table are distinguished. 2
table 2
1.5. For the porcelain-faience and ceramic industries, binders are produced with the setting times established for normal-hardening gypsum.
1.6. Depending on the degree of grinding, the types of binders listed in the table are distinguished. 3.
Table 3
1.7. For the porcelain, earthenware and ceramics industries, finely ground binders are produced with a maximum residue on a sieve with cells with a clear mesh size of 0.2 mm of no more than 1%.
1.8. The manufacturer must determine the specific surface area of the finely ground gypsum binder at least once a month and indicate its value in a document of the established form.
1.9. Binders used in porcelain, earthenware, ceramics and other industries must meet the additional requirements specified in Table. 4.
Table 4
1.10. Binders of the highest quality category must meet the additional requirements specified in table. 5.
Table 5
Example symbol gypsum binder with a strength of 5.2 MPa (52 kgf/cm2) with setting times: beginning - 5 minutes, end - 9 minutes and residue on the sieve with a mesh size in the light of 0.2 mm 9%, i.e. brand binder G-5, fast-hardening, medium grind:
G-5 AII
Note. Possible areas of application of gypsum binders are indicated in Appendix 1.
2. ACCEPTANCE RULES* AND TEST METHODS
2.1. Delivery and acceptance of binders is carried out in batches. A batch is considered to be binder of one type and one brand.
The batch size is determined depending on the annual capacity of the enterprise in the following quantities:
up to 200 tons - with an annual capacity of over 150 thousand tons;
up to 65 tons - with an annual capacity of up to 150 thousand tons.
When shipping binders in courts, the size of the batch is determined by agreement of the parties.
2.2. The manufacturer must guarantee and confirm with a document in the established form that the properties of the binder comply with the requirements of this standard based on the results of current tests.
2.3. The consumer has the right to carry out a control check of compliance of the properties of the binder with the requirements of this standard, using the sampling procedure and test methods in accordance with GOST 23789.
If a discrepancy is detected between the bending or compressive strength of the binder and the grade specified in the relevant document, it must be changed in accordance with the actual strength.
2.4. Sampling and testing methods for binders are carried out in accordance with GOST 23789.
3. PACKAGING, LABELING, TRANSPORTATION AND STORAGE**
__________________
* Acceptance rules - according to GOST 26871.
** Packaging, labeling, transportation and storage - in accordance with GOST 26871.
3.1. Binders are shipped unpacked or packed in bags in accordance with GOST 2226 and other containers.
3.2. Binders used for the porcelain-faience and ceramic industries, as well as for special purposes, must be shipped only packed in bags in accordance with GOST 2226.
3.3. The manufacturer must accompany each shipment with a document in the prescribed form, which indicates:
name of the organization subordinate to which the manufacturer is located;
name and address of the manufacturer;
batch number and date of issue of the document;
batch weight and dispatch date;
name and address of the recipient;
designation of the binder according to clause 1.10 and the results of physical and mechanical tests;
specific surface area for finely ground astringent;
designation of this standard;
3.4. During transportation and storage, binders must be protected from moisture and contamination.
4. MANUFACTURER WARRANTY
4.1. The manufacturer must ensure that the properties of the binders comply with the requirements of this standard, subject to the conditions of transportation and storage.
The guaranteed shelf life of binders is 2 months. from the moment of manufacture.
ANNEX 1
|
Areas of application of gypsum binders |
|
|
Production of gypsum building products of all types |
G-2-G-7, all hardening periods and degrees of grinding |
|
Manufacturing of thin-walled building products and decorative parts |
G-2-G-7, fine and medium grinding, fast and normal hardening |
|
Plastering works, seam sealing and special purposes |
G-2-G-25, normal and slow hardening, medium and fine grinding |
|
Manufacturing of molds and models in porcelain and earthenware, ceramics, engineering and other industries, as well as medicine |
G-5-G-25, fine grinding with normal hardening times |
|
For medical purposes |
G-2-G-7, fast and normal hardening, medium and fine grinding |
APPLICATION
Information
INFORMATION DATA ABOUT COMPLIANCE WITH THIS STANDARD ST SEV 826-77
By Decree of the USSR State Committee for Construction Affairs dated July 19, 1979 No. 123, the introduction date was established
from 01.07.80
This standard applies to gypsum binders obtained by heat treatment of gypsum raw materials to calcium sulfate hemihydrate and used for the manufacture of building products of all types and during construction work, as well as for the manufacture of forms and models in porcelain, earthenware, ceramics and other industries.
This standard complies with the requirements of the CMEA standard 826-77 in the part specified in the appendix.
Requirements for medical gypsum must be established by the appropriate regulatory and technical document developed on the basis of ST SEV 826-77.
1. TECHNICAL REQUIREMENTS
1.1. Gypsum binders must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the manner established by the manufacturer's ministry.
1.2. For the production of binders, gypsum stone is used in accordance with GOST 4013-82 or phosphogypsum in accordance with the current regulatory and technical documentation.
1.3. Depending on the compressive strength, the following grades of gypsum binders are distinguished: G-2, G-3, G-4, G-5, G-6, G-7, G-10, G-13, G-16, G -19, G-22, G-25.
The minimum tensile strength of each brand of binder must correspond to the values given in table. 1.
Table 1
MPa (kgf/cm 2)
|
Binder grade |
Tensile strength of beam samples with dimensions 40×40×160 mm at the age of 2 hours, not less |
|
|
when compressed |
when bending |
|
1.4. Depending on the setting time, the types of binders listed in table differ. 2.
table 2
1.5. For the porcelain-faience and ceramic industries, binders are produced with the setting times established for normal-hardening gypsum.
1.6. Depending on the degree of grinding, the types of binders listed in table are distinguished. 3.
Table 3
1.7. For the porcelain, earthenware and ceramics industries, finely ground binders are produced with a maximum residue on a sieve with cells with a clear mesh size of 0.2 mm of no more than 1%.
1.8. The manufacturer must determine the specific surface area of the finely ground gypsum binder at least once a month and indicate its value in a document of the established form.
1.9. Binders used in porcelain, earthenware, ceramics and other industries must meet the additional requirements specified in Table. 4.
Table 4
1.10. Binders of the highest quality category must meet the additional requirements specified in table. 5.
Table 5
An example of a symbol for a gypsum binder with a strength of 5.2 MPa (52 kgf/cm 2) with setting times: beginning - 5 minutes, end - 9 minutes and residue on a sieve with a clear cell size of 0.2 mm 9%, i.e. . binder grade G-5, fast-hardening, medium grinding:
G-5 A II
Note. Possible areas of application of gypsum binders are indicated in Appendix 1.
2. ACCEPTANCE RULES AND TEST METHODS
2.1. Delivery and acceptance of binders is carried out in batches. A batch is considered to be binder of one type and one brand.
The batch size is determined depending on the annual capacity of the enterprise in the following quantities:
up to 200 tons - with an annual capacity of over 150 thousand tons;
up to 65 tons - with an annual capacity of up to 150 thousand tons.
When shipping binders in courts, the size of the batch is determined by agreement of the parties.
2.2. The manufacturer must guarantee and confirm with a document in the established form that the properties of the binder comply with the requirements of this standard based on the results of current tests.
2.3. The consumer has the right to carry out a control check of compliance of the properties of the binder with the requirements of this standard, using the sampling procedure and test methods in accordance with GOST 23789-79.
If a discrepancy is detected between the bending or compressive strength of the binder and the grade specified in the relevant document, it must be changed in accordance with the actual strength.
2.4. Sampling and testing methods for binders are carried out in accordance with GOST 23789-79.
3. PACKAGING, LABELING, TRANSPORTATION AND STORAGE
3.1. The binder is shipped unpacked or packed in bags in accordance with GOST 2226-88 and other containers.
3.2. Binders used for the porcelain-faience and ceramic industries, as well as for special purposes, must be shipped only packed in bags in accordance with GOST 2226-88.
3.3. The manufacturer must accompany each shipment with a document in the prescribed form, which indicates:
Name of the organization subordinate to which the manufacturer is located;
Name and address of the manufacturer;
Batch number and date of issue of the document;
Batch weight and dispatch date;
Recipient's name and address;
Designation of binder according to clause 1.11 and results of physical and mechanical tests;
Specific surface area for finely ground astringent;
Designation of this standard.
3.4. During transportation and storage, gypsum binders must be protected from moisture and contamination.
4. MANUFACTURER WARRANTY
4.1. The manufacturer must ensure that the properties of gypsum binders comply with the requirements of this standard, subject to the conditions of transportation and storage.
The guaranteed shelf life of gypsum binders is 2 months from the date of manufacture.
ANNEX 1
|
Areas of application of gypsum binders |
|
|
1. Manufacturing of gypsum building products of all types |
G-2 ÷ G-7, all hardening periods and degrees of grinding |
|
2. Manufacturing of thin-walled building products and decorative parts |
G-2 ÷ G-7, fine and medium grinding, fast and normal hardening |
|
3. Production of plastering works, grouting and special purposes |
G-2 ÷ G-25, normal and slow hardening, medium and fine grinding |
|
4. Manufacturing of forms and models in porcelain and earthenware, ceramics, engineering and other industries, as well as medicine Clause 2.3 of GOST 125-79 corresponds to clause 2.3 of ST SEV 826-77. Clause 3.1 of GOST 125-79 corresponds to clause 4.1 of ST SEV 826-77. Clause 3.3 of GOST 125-79 corresponds to clause 4.2 of ST SEV 826-77. Clause 3.4 of GOST 125-79 corresponds to clause 4.4 of ST SEV 826-77. Section 4 of GOST 125-79 corresponds to section 5 of ST SEV 826-77. |
Gypsum binders, GOST 125-79
Construction Materials. GOST 125-79 - Gypsum binders. Specifications. OKS: Building materials and construction, Construction materials. GOST standards. Gypsum binders. Technical conditions. class=text>
GOST 125-79
Gypsum binders. Specifications
GOST 125-79
Group Zh12
INTERSTATE STANDARD
GYPSUM BINDERS
Specifications
Gypsum binders. Specifications
OKP 57 4431
Date of introduction 1980-07-01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Construction Materials Industry of the USSR
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated July 19, 1979 N 123.
3. INSTEAD GOST 125-70, GOST 5.1845-73
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
5. REPUBLICATION. October 2002
This standard applies to gypsum binders obtained by heat treatment of gypsum raw materials to calcium sulfate hemihydrate and used for the manufacture of building products of all types and during construction work, as well as for the manufacture of forms and models in porcelain, earthenware, ceramics and other industries.
The standard complies with the requirements of ST SEV 826-77 in the part specified in Appendix 2.
Requirements for medical gypsum must be established by the appropriate regulatory and technical document developed on the basis of ST SEV 826-77.
1. TECHNICAL REQUIREMENTS
1. TECHNICAL REQUIREMENTS
1.1. Binders must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the manner established by the manufacturer's ministry.
1.2. For the production of binders, gypsum stone is used in accordance with GOST 4013 or phosphogypsum in accordance with the current regulatory and technical documentation.
1.3. Depending on the compressive strength, the following grades of gypsum binders are distinguished: G-2, G-3, G-4, G-5, G-6, G-7, G-10, G-13, G-16, G -19, G-22, G-25.
The minimum tensile strength of each brand of binder must correspond to the values given in Table 1.
Table 1
Binder grade | Ultimate strength of beam samples with dimensions 40x40x160 mm at the age of 2 hours, MPa (kgf/cm), not less |
|
when compressed | when bending |
|
1.4. Depending on the setting time, the types of binders listed in Table 2 are distinguished.
table 2
1.5. For the porcelain-faience and ceramic industries, binders are produced with the setting times established for normal-hardening gypsum.
1.6. Depending on the degree of grinding, the types of binders listed in Table 3 are distinguished.
Table 3
1.7. For the porcelain, earthenware and ceramics industries, finely ground binders are produced with a maximum residue on a sieve with cells with a clear mesh size of 0.2 mm of no more than 1%.
1.8. The manufacturer must determine the specific surface area of the finely ground binder at least once a month and indicate its value in a document of the established form.
1.9. Binders used in porcelain, earthenware, ceramics and other industries must meet the additional requirements specified in Table 4.
Table 4
1.10. Binders of the highest quality category must meet the additional requirements specified in Table 5.
Table 5
An example of a symbol for a gypsum binder with a strength of 5.2 MPa (52 kgf/cm) with setting times: beginning - 5 minutes, end - 9 minutes and residue on a sieve with a clear cell size of 0.2 mm 9%, i.e. binder grade G-5, fast-hardening, medium grinding:
G-5 A II
Note. Possible areas of application of binders are indicated in Appendix 1.
2. ACCEPTANCE RULES AND TEST METHODS
________________
* Acceptance rules - according to GOST 26871.
2.1. Delivery and acceptance of binders is carried out in batches. A batch is considered to be binder of one type and one brand.
The batch size is determined depending on the annual capacity of the enterprise in the following quantities:
Up to 200 tons - with an annual capacity of St. 150 thousand tons;
- up to 65 tons - with an annual capacity of up to 150 thousand tons.
When exporting binder to the courts, the size of the batch is determined by agreement of the parties.
2.2. The manufacturer must guarantee and confirm with a document in the established form that the properties of the binder comply with the requirements of this standard based on the results of current tests.
2.3. The consumer has the right to carry out a control check of compliance of the properties of the binder with the requirements of this standard, using the sampling procedure and test methods in accordance with GOST 23789.
If a discrepancy is detected between the bending or compressive strength of the binder and the grade specified in the relevant document, it must be changed in accordance with the actual strength.
2.4. Sampling and testing methods for binders are carried out in accordance with GOST 23789.
3. PACKAGING, LABELING, TRANSPORTATION AND STORAGE
________________
* Packaging, labeling, transportation and storage - in accordance with GOST 26871.
3.1. Binders are shipped unpacked or packed in bags in accordance with GOST 2226 and other containers.
3.2. Binders used for the porcelain-faience and ceramic industries, as well as for special purposes, must be shipped only packed in bags in accordance with GOST 2226.
3.3 The manufacturer must accompany each shipped batch with a document in the prescribed form, which indicates:
- name of the organization subordinate to which the manufacturer is located;
- name and address of the manufacturer;
- batch number and date of issue of the document;
Batch weight and dispatch date;
- name and address of the recipient;
- designation of the binder according to clause 1.10 and the results of physical and mechanical tests;
- specific surface area for finely ground astringent;
- designation of this standard.
3.4. During transportation and storage, binders must be protected from moisture and contamination.
4. MANUFACTURER WARRANTY
4.1. The manufacturer must ensure that the properties of gypsum binders comply with the requirements of this standard, subject to the conditions of transportation and storage.
The guaranteed shelf life of binders is 2 months from the date of manufacture.
APPENDIX 1 (for reference). AREA OF APPLICATION OF GYPSUM BINDERS
ANNEX 1
Information
Scope of application of binders | |
1. Manufacturing of gypsum building products of all types | G-2 - G-7, all hardening periods and degrees of grinding |
2. Manufacturing of thin-walled building products and decorative parts | G-2 - G-7, fine and medium grinding, fast and normal hardening |
3. Production of plastering works, sealing joints and special purposes | G-2 - G-25, normal and slow hardening, medium and fine grinding |
4. Manufacturing of forms and models in porcelain and earthenware, ceramics, engineering and other industries, as well as medicine | G-5 - G-25, fine grinding with normal hardening times |
5. For medical purposes | G-2 - G-7, fast and normal hardening, medium and fine grinding |
APPENDIX 2 (for reference). INFORMATION DATA ABOUT COMPLIANCE WITH GOST 125-79 ST SEV 826-77
APPENDIX 2
Information
INFORMATION DATA ABOUT COMPLIANCE WITH THIS STANDARD ST SEV 826-77
Section, clause GOST 125-79 | Section, paragraph ST SEV 826-77 |
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Group Zh12
INTERSTATE STANDARD
GYPSUM BINDERS
Specifications
Gypsum binders. Specifications
Text Comparison of GOST 125-79 with GOST 125-2018, see the link.
- .
____________________________________________________________________
OKP 57 4431
Date of introduction 1980-07-01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Construction Materials Industry of the USSR
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated July 19, 1979 N 123.
3. INSTEAD GOST 125-70, GOST 5.1845-73
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
5. REPUBLICATION. October 2002
This standard applies to gypsum binders obtained by heat treatment of gypsum raw materials to calcium sulfate hemihydrate and used for the manufacture of building products of all types and during construction work, as well as for the manufacture of forms and models in porcelain, earthenware, ceramics and other industries.
The standard complies with the requirements of ST SEV 826-77 in the part specified in Appendix 2.
Requirements for medical gypsum must be established by the appropriate regulatory and technical document developed on the basis of ST SEV 826-77.
1. TECHNICAL REQUIREMENTS
1. TECHNICAL REQUIREMENTS
1.1. Binders must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the manner established by the manufacturer's ministry.
1.2. For the production of binders, gypsum stone is used in accordance with GOST 4013 or phosphogypsum in accordance with the current regulatory and technical documentation.
1.3. Depending on the compressive strength, the following grades of gypsum binders are distinguished: G-2, G-3, G-4, G-5, G-6, G-7, G-10, G-13, G-16, G -19, G-22, G-25.
The minimum tensile strength of each brand of binder must correspond to the values given in Table 1.
Table 1
Binder grade | Ultimate strength of beam samples with dimensions 40x40x160 mm at the age of 2 hours, MPa (kgf/cm), not less |
|
when compressed | when bending |
|
1.4. Depending on the setting time, the types of binders listed in Table 2 are distinguished.
table 2
1.5. For the porcelain-faience and ceramic industries, binders are produced with the setting times established for normal-hardening gypsum.
1.6. Depending on the degree of grinding, the types of binders listed in Table 3 are distinguished.
Table 3
1.7. For the porcelain, earthenware and ceramics industries, finely ground binders are produced with a maximum residue on a sieve with cells with a clear mesh size of 0.2 mm of no more than 1%.
1.8. The manufacturer must determine the specific surface area of the finely ground binder at least once a month and indicate its value in a document of the established form.
1.9. Binders used in porcelain, earthenware, ceramics and other industries must meet the additional requirements specified in Table 4.
Table 4
1.10. Binders of the highest quality category must meet the additional requirements specified in Table 5.
Table 5
An example of a symbol for a gypsum binder with a strength of 5.2 MPa (52 kgf/cm) with setting times: beginning - 5 minutes, end - 9 minutes and residue on a sieve with a clear cell size of 0.2 mm 9%, i.e. binder grade G-5, fast-hardening, medium grinding:
G-5 A II
Note. Possible areas of application of binders are indicated in Appendix 1.
2. ACCEPTANCE RULES AND TEST METHODS
________________
* Acceptance rules - according to GOST 26871.
2.1. Delivery and acceptance of binders is carried out in batches. A batch is considered to be binder of one type and one brand.
The batch size is determined depending on the annual capacity of the enterprise in the following quantities:
Up to 200 tons - with an annual capacity of St. 150 thousand tons;
Up to 65 tons - with an annual capacity of up to 150 thousand tons.
When shipping binders in courts, the size of the batch is determined by agreement of the parties.
2.2. The manufacturer must guarantee and confirm with a document in the established form that the properties of the binder comply with the requirements of this standard based on the results of current tests.
2.3. The consumer has the right to carry out a control check of compliance of the properties of the binder with the requirements of this standard, using the sampling procedure and test methods in accordance with GOST 23789.
If a discrepancy is detected between the bending or compressive strength of the binder and the grade specified in the relevant document, it must be changed in accordance with the actual strength.
2.4. Sampling and testing methods for binders are carried out in accordance with GOST 23789.
3. PACKAGING, LABELING, TRANSPORTATION AND STORAGE
________________
* Packaging, labeling, transportation and storage - in accordance with GOST 26871.
3.1. Binders are shipped unpacked or packed in bags in accordance with GOST 2226 and other containers.
3.2. Binders used for the porcelain-faience and ceramic industries, as well as for special purposes, must be shipped only packed in bags in accordance with GOST 2226.
3.3 The manufacturer must accompany each shipped batch with a document in the prescribed form, which indicates:
Name of the organization subordinate to which the manufacturer is located;
Name and address of the manufacturer;
Batch number and date of issue of the document;
Batch weight and dispatch date;
Recipient's name and address;
Designation of the binder according to clause 1.10 and the results of physical and mechanical tests;
Specific surface area for finely ground astringent;
Designation of this standard.
3.4. During transportation and storage, binders must be protected from moisture and contamination.
4. MANUFACTURER WARRANTY
4.1. The manufacturer must ensure that the properties of gypsum binders comply with the requirements of this standard, subject to the conditions of transportation and storage.
The guaranteed shelf life of binders is 2 months from the date of manufacture.
APPENDIX 1 (for reference). AREA OF APPLICATION OF GYPSUM BINDERS
ANNEX 1
Information
Scope of application of binders | |
1. Manufacturing of gypsum building products of all types | G-2 - G-7, all hardening periods and degrees of grinding |
2. Manufacturing of thin-walled building products and decorative parts | G-2 - G-7, fine and medium grinding, fast and normal hardening |
3. Production of plastering works, sealing joints and special purposes | G-2 - G-25, normal and slow hardening, medium and fine grinding |
4. Manufacturing of forms and models in porcelain and earthenware, ceramics, engineering and other industries, as well as medicine | G-5 - G-25, fine grinding with normal hardening times |
5. For medical purposes | G-2 - G-7, fast and normal hardening, medium and fine grinding |
APPENDIX 2 (for reference). INFORMATION DATA ABOUT COMPLIANCE WITH GOST 125-79 ST SEV 826-77
APPENDIX 2
Information
INFORMATION DATA ABOUT COMPLIANCE WITH THIS STANDARD ST SEV 826-77
Electronic document text
and verified by:
official publication
M.: IPK Standards Publishing House, 2002
UDC 691.55:006.354 Group Zh12
INTERSTATE STANDARD
GYPSUM BINDERS
Specifications
Gypsum binders. Specifications
OKP 57 4431
Date of introduction 07/01/80
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Construction Materials Industry of the USSR
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated July 19, 1979 No. 123
3. INSTEAD GOST 125-70, GOST 5.1845-73
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
5. REPUBLICATION. October 2002
This standard applies to gypsum binders obtained by heat treatment of gypsum raw materials to calcium sulfate hemihydrate and used for the manufacture of building products of all types and during construction work, as well as for the manufacture of forms and models in porcelain, earthenware, ceramics and other industries.
The standard complies with the requirements of the standard ST SEV 826-77 in the part specified in Appendix 2.
Requirements for medical gypsum must be established by the appropriate regulatory and technical document developed on the basis of ST SEV 826-77.
1. TECHNICAL REQUIREMENTS
1.1. Binders must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the manner established by the manufacturer's ministry.
For the production of binders, gypsum stone is used in accordance with GOST 4013 or phosphogypsum in accordance with the current regulatory and technical documentation.
1.3. Depending on the compressive strength, the following grades of binders are distinguished: G-2, G-3, G-4, G-5, G-6, G-7, G-10, G-13, G-16, G- 19, G-22, G-25.
The minimum tensile strength of the binder for each brand of binder must correspond to the values given in table. 1.
