GB/T 23265-2023 English PDF (GBT23265-2023)

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GB/T 23265-2023: Chopped basalt fiber for cement concrete and mortar
GB/T 23265-2023
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
Chopped Basalt Fiber for Cement Concrete and Mortar
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
GB/T 14685 Pebble and crushed stone for construction
GB/T 18374 Reinforcement Terminology
GB/T 21120-2018 Synthetic fibers for cement concrete and mortar
GB/T 50081 Standard for test methods of concrete physical and mechanical properties
JGJ 55 Specification for mix proportion design of ordinary concrete
negotiation between the supplier and the purchaser.
4.3 Labeling of product
The labeling of product shall consist of purpose, fiber type, nominal diameter, nominal length
and standard number.
EXAMPLE 1: The labeling of the crack-proof and anti-cracking chopped basalt fiber strands for
concrete with a nominal diameter of 20μm and a nominal length of 25mm is as follows:
BF S 20μm-25 GB/T23265
EXAMPLE 2: The labeling of the toughening and reinforcing chopped basalt fiber plied yarn for concrete
with a nominal diameter of 200μm and a nominal length of 40mm is as follows:
BZ T 200μm-40 GB/T23265
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.
5.2 The raw materials for the production of chopped basalt fiber shall be basalt or igneous rocks
with basalt as the main component, which are melted at high temperature and then drawn by a
sieve plate to produce uniformly dispersed continuous fibers.
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
6.2.1 The length deviation of chopped basalt fiber shall be no greater than ±2mm of the nominal
length.
6.2.2 The diameter deviation of chopped basalt fiber should be no greater than ±10% of the
625℃ for no less than 30min, and the sample shall be cooled to room temperature 20℃±5℃
in a dryer before the test.
7.3.5 Moisture content
The moisture content of basalt fiber shall be determined according to the method specified in
GB/T 9914.1.
7.3.6 Combustible matter content
The combustible matter content of basalt fiber shall be determined according to the method
specified in GB/T 9914.2.
7.3.7 Alkali-resistant tensile stress retention rate
The alkali-resistant tensile stress retention rate of the plied yarn shall be determined according
to the method specified in Appendix C. The alkali-resistant tensile stress retention rate of the
strand shall be determined according to the method specified in Appendix D.
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.
7.4.2.3 Stone
Crushed stone with a particle size of 5mm~20mm shall comply with the provisions of GB/T
14685.
7.4.2.4 Water
It shall meet the requirements of JGJ 63.
7.4.2.5 Admixtures
It shall meet the requirements of GB 8076-2008.
7.4.2.6 Fiber
Chopped basalt fiber to be tested.
7.4.3 Preparation of concrete and mortar
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:
a) The concrete strength grade is C30;
b) When using admixtures and other concrete admixtures, the concrete mix ratio shall be
adjusted according to the requirements of the corresponding standards;
c) Chopped basalt fiber: the recommended dosage of the test fiber provided by the client;
d) Water consumption of the reference concrete: to make the slump of the concrete reach
180mm±20mm. The test concrete and the reference concrete use the same mix ratio, only
the fiber content is increased.
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:
a) The raw materials for the test shall be weighed and measured, and the accuracy of mass
weighing is: ±0.2% for cement, water, adm...