GB/T 23265-2023 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 23265-2023 | English | 470 |
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Chopped basalt fiber for cement concrete and mortar
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| GB/T 23265-2009 | English | 439 |
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Chopped basalt fiber for cement, cement mortar and concrete
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GB/T 23265-2023: Chopped basalt fiber for cement concrete and mortar---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT23265-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.40
CCS Q 12
Replacing GB/T 23265-2009
Chopped Basalt Fiber for Cement Concrete and Mortar
Issued on. MAY 23, 2023
Implemented on. DECEMBER 1, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 7
4 Classification and Labeling... 8
5 General Requirements... 9
6 Technical Requirements... 9
7 Test Method... 11
8 Inspection Rules... 16
9 Marking, Exit-Factory, Packaging, Transportation and Storage... 17
Appendix A (Normative) Test Method for Breaking Strength and Tensile Strength of
Plied Yarn... 19
Appendix B (Normative) Test Methods for Breaking Strength, Tensile Strength, Elastic
Modulus and Elongation at Break of Strand... 23
Appendix C (Normative) Test Method of Alkali-Resistant Tensile Stress Retention Rate
of the Piled Yarn... 30
Appendix D (Normative) Test Method of Alkali-Resistant Tensile Stress Retention Rate
of Strand... 32
Appendix E (Normative) Bending Toughness Test Method... 34
1 Scope
This Document specifies the classification and marking, general requirements, technical
requirements, test methods, inspection rules, as well as marking, delivery, packaging,
transportation and storage of chopped basalt fibers for cement concrete and mortar.
This Document is applicable to chopped basalt fibers for cement concrete and mortar.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB 175 Common portland cement
GB/T 4472-2011 Determination of density and relative density for chemical products
GB/T 7690.5-2013 Reinforcements - Test method for yarns - Part 5.Determination of fiber
diameter for glass fiber
GB 8076-2008 Concrete Admixtures
GB/T 9914.1 Test method for reinforcement products - Part 1.Determination of moisture
content
GB/T 9914.2 Test method for reinforcement products - Part 2.Determination of
combustible-matter content for glass fiber
GB/T 14684 Sand for construction
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 18374 and the
following apply.
3.1 Chopped basalt fiber
The basalt fiber is cut into a certain length by a cutter so that it can be inorganic mineral fiber
that is evenly dispersed in cement concrete or mortar.
3.2 Nominal diameter
It is used to indicate the diameter of basalt fiber monofilament in basalt fiber products.
3.3 Strand
A bundle of slightly bonded filaments drawn at the same time.
3.4 Plied yarn
Fibers that are made by plying two or more strands.
3.5 Moisture content
The moisture content of the strand or plied yarn measured under specified conditions, that is,
the ratio of the difference between the wet mass and the dry mass of the specimen o the wet
mass.
4 Classification and Labeling
4.1 Classification of product
4.1.1 Chopped basalt fibers are classified into strand (code S) and plied yarn (code T) according
to their fiber types.
4.2 Specifications and dimensions
4.2.1 The specifications and dimensions of chopped basalt fibers shall comply with the
provisions of Table 1.
4.2.2 Chopped basalt fibers of other specifications and dimensions can be produced upon
negotiation between the supplier and the purchaser.
5 General Requirements
5.1 The products included in this Document shall not cause harm to humans, organisms and the
environment; and shall comply with the relevant standards and specifications for safety and
environmental issues related to production and use.
5.3 The appearance of chopped basalt fiber shall be golden brown.
5.4 Chopped basalt fiber shall be used in accordance with the specific dosage provided by the
manufacturer. The mixing method of the test concrete or mortar during construction shall be
carried out in accordance with the mixing method provided in the instructions of the test product.
6 Technical Requirements
6.1 Appearance quality
The chopped basalt fiber has uniform color and no surface pollution.
6.2 Dimension deviation
6.3 Performance index of chopped basalt fiber
6.3.1 The performance index of chopped basalt fiber shall meet the requirements of Table 2.
Table 2 – Performance index of chopped basalt fiber
6.4 Performance index of cement concrete and mortar mixed with chopped basalt fiber
The performance index of cement concrete and mortar mixed with chopped basalt fibers shall
meet the requirements of Table 3.
7 Test Method
7.1 Appearance quality
Normal illumination, distance 0.5m, visual inspection.
7.2 Dimension deviation
7.3 Performance index test of chopped basalt fiber
7.3.1 Tensile strength
The tensile strength of the plied yarn fiber shall be measured according to the method specified
in Appendix A; and the tensile strength of the strand fiber shall be measured according to the
method specified in Appendix B.
7.4 Performance test of cement concrete and mortar mixed with chopped basalt fiber
7.4.1 Test environment
The test shall be carried out indoors at a temperature of 20℃±5℃. The raw materials for mixing
concrete or mortar shall be transported indoors in advance and the storage time shall be no less
than 24h.
7.4.2 Test materials
7.4.2.1 Cement
Cement with a P•O42.5 shall comply with the provisions of GB 175.
7.4.2.2 Sand
Medium sand with a mud content of less than 1% shall comply with the provisions of GB/T
14684.
7.4.3.1 Concrete
The mix ratio of the reference concrete and the test concrete shall be designed according to JGJ
55 and shall comply with the following provisions.
7.4.3.2 Mortar
The mass mix ratio of cement, sand and water in the reference mortar is. 1.1.5.0.5.The mass
mix ratio of cement, sand and water in the test mortar is. 1.1.5.0.5; and the chopped basalt fiber
is the recommended dosage of the test fiber provided by the client.
7.4.3.3 Measuring and mixing of concrete and mortar
The measuring and mixing of concrete and mortar shall comply with the following provisions.
7.4.4 Test piece preparation, curing and number of specimens required for testing
7.4.4.1 Concrete test piece preparation and curing shall be carried out in accordance with GB/T
50081; and the standard curing age of hardened concrete or mortar is 28 days. The test items
and the number of required test pieces are detailed in Table 4.
7.4.4.2 During the test, three batches of concrete or mortar for testing one type of fiber shall be
completed on the same day.
7.4.5 Concrete and mortar crack reduction factor
The concrete and mortar crack reduction factor test of shall be carried out in accordance with
Appendix E of GB/T 21120-2018.
7.4.6 Hardened concrete and mortar
7.4.6.4 Concrete impact strength ratio
The concrete impact strength ratio is measured according to Appendix G of GB/T 21120-2018.
8 Inspection Rules
8.1 Exit-factory inspection
8.1.1 Exit-factory inspection items
It includes appearance, size, density, moisture content, and combustible matter content.
8.2 Type inspection
8.2.1 Type inspection conditions
Type inspection shall be carried out in any of the following situations.
a) When the new product or old product is transferred to the factory for trial production and
identification;
8.2.2 Type inspection items
It includes all technical requirements in Clause 6.
8.2.3 Batching rules
The same as 8.1.2.
8.2.4 Sampling and sample retention
Take the batch as a unit. The sampling quantity of each batch is 2kg of Type-S fiber and 10kg
of Type-T fiber. Each batch of samples is divided into two equal portions, one is inspected
according to the specified items; and the other is sealed and kept for half a year in preparation
for re-inspection or arbitration.
9 Marking, Exit-Factory, Packaging, Transportation and Storage
9.1 Marking
The following content shall be marked on all packages in a prominent position. product name,
mark, net mass, manufacturer name, factory address, production date, this Document number,
etc. If there is a trademark, it shall be marked on the product package. Labor protection tips
shall be specially marked on the packaging.
9.2 Exit-factory
9.2.2 The manufacturer shall provide product instructions with the goods, which shall include
product name and model, exit-factory date, main characteristics, scope of application and
recommended dosage, storage conditions, usage methods and precautions.
9.3 Packaging, transportation and storage
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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