GB/T 23265-2023 PDF English
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Chopped basalt fiber for cement concrete and mortar
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GB/T 23265-2023: PDF in English (GBT 23265-2023) 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, admixtures and chopped basalt fiber; ±0.5% for
sand and stone.
b) If a 60L or 100L forced concrete mixer is used, and the mixing volume shall be controlled
between 10L and 45L to ensure uniform mixing. The material input and mixing time are
generally: sand, stone, cement, water and admixture are mixed for 60s to 90s; and then
the fiber is added and mixed for 25s to 35s. After the material is discharged, it is manually
turned over on the iron plate for 2 to 3 times before test.
c) If a 15L mortar mixer is used to mix the mortar, and the mixing method is carried out in
accordance with the mixing method of concrete.
7.4.4 Test piece preparation, curing and number of specimens required for testing
7.4.6.3 Bending toughness (energy absorption value)
The bending toughness (energy absorption value) is measured according to the method in
Appendix E.
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.
8.1.2 Batching rules
Products of the same variety, specification, production process, and stable and continuous
production are a batch. Each batch is 10t, and less than 10t is also a batch.
8.1.3 Sampling and retention of samples
Take batch as a unit, 1kg of samples are taken for each batch. The samples of each batch are
divided into two equal portions, one is inspected according to the specified items; and the other
is sealed and stored for half a year in preparation for re-inspection or arbitration.
8.1.4 Judgment rules
After the product is inspected, if the performance indicators of the test fibers meet the
requirements of this Document, the batch of fibers is judged to be qualified. If they do not meet
the requirements of this Document, the batch of fibers is judged to be unqualified.
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;
b) After formal production, if there are major changes in materials and processes, which
may affect product performance;
c) During normal production, inspection shall be carried out at least once a year;
d) When the production is stopped for more than half a year and then resumed;
e) When the exit-factory inspection results are significantly different from the last type
inspection.
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.
8.2.5 Judgment rules
After product is inspected, if the performance indicators of chopped basalt fiber meet the
requirements of Clause 6, the batch of chopped basalt fiber shall be judged to be qualified; if it
does not meet the requirements of Clause 6, the batch of chopped basalt fiber shall be judged
to be unqualified.
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
9.2.1 Product that has any of the following conditions shall not leave the factory:
a) Defective products;
b) Incomplete technical documents (product instructions, certificates, inspection reports);
Appendix A
(Normative)
Test Method for Breaking Strength and Tensile Strength of
Plied Yarn
A.1 Overview
This method is applicable to the test for breaking strength and tensile strength of chopped plied
yarn with a fiber length of no less than 30 mm. For plied yarn with a fiber length of less than
30 mm, the supplier shall provide homogeneous products with a fiber length of no less than 30
mm for this item test.
A.2 Principle
Under specified conditions, the chopped plied yarn is stretched to break on a tensile testing
machine, and the breaking strength measurement value of the specimen is obtained from the
data display and acquisition system, and the tensile strength is obtained by calculation.
A.3 Apparatus
The apparatus includes:
a) Tensile testing machine, precision level 1;
b) Electric constant temperature blast drying oven, controllable temperature 100℃,
accuracy ±2℃.
A.4 Materials
The materials are mainly adhesive sheets and fiber adhesives.
A.5 Test method
A.5.1 Test conditions
A.5.1.1 Specimen processing
a) The specimen shall be divided into four parts in the provided sample.
b) Place the specimen in an oven at 50℃±2℃ and dry for 1h±5min. Cool to room
temperature in the dryer and reinforce both ends of each fiber (the length of the reinforced
part at both ends of the fiber is no less than 10mm) with adhesive sheets and fiber
adhesive to ensure that the fiber length of the middle test part is equal to 10mm±1mm.
Appendix B
(Normative)
Test Methods for Breaking Strength, Tensile Strength,
Elastic Modulus and Elongation at Break of Strand
B.1 Overview
This method is applicable to the determination of breaking strength, tensile strength, elastic
modulus and elongation at break of strand with a length of no less than 15mm. During the test,
the monofilament or protofilament of strand is taken. For strand with a length of less than 15mm,
the supplier shall provide homogeneous products with a length of no less than 15mm for this
item test.
B.2 Principle
Take a single fiber from the strand and stretch it to break on a constant-speed elongation tensile
tester under specified conditions. The measured values of tensile properties such as breaking
strength, tensile strength, elastic modulus, and elongation at break of the specimen are obtained
from the load-elongation curve or data display and acquisition system.
B.3 Apparatus
The main apparatus includes:
a) Fiber strength tester: load measurement range: can adapt to the maximum load
requirements of the specimen. Load measurement error: ±1%. Load measurement
resolution: 0.001N. Elongation measurement range: 100mm. Elongation measurement
error: ≤0.05mm. Elongation measurement resolution: 0.1%. Lower clamp descending
speed: continuously adjustable. Clamp spacing: 1mm~20mm continuously adjustable.
Lower clamp stroke: 100mm. With load-elongation curve output function or initial
modulus automatic calculation function;
b) Microscope: should be able to meet the measurement value, accurate to 0.5μm,
magnification 400~1000;
c) Electrothermal constant temperature blast drying oven: with controllable temperature of
100℃, accuracy of ±2℃.
B.4 Test method
B.4.1 Test conditions
Appendix C
(Normative)
Test Method of Alkali-Resistant Tensile Stress Retention
Rate of the Piled Yarn
C.1 Overview
This method is applicable to the test of alkali-resistant tensile stress retention rate of plied yarn
with a length of no less than 30mm. For plied yarn basalt fiber with a length of less than 30mm,
the supplier shall provide homogeneous products with a length of no less than 30mm for this
item test.
C.2 Apparatus
The apparatus includes:
a) Tensile testing machine: accuracy level 1; the test force value shall be within the range of
20%~80% of the instrument range; and have displacement control function;
b) Electrothermal constant temperature blast drying oven: with controllable temperature of
100℃, accuracy of ±2℃;
c) Water bath: temperature control range (0~100)℃, accuracy ±2℃;
d) Balance: graduation value is 0.1g;
e) Measuring cup: range is 1000mL;
f) Storage container with lid, mixer, and spatula.
C.3 Materials
The materials include:
a) Reference cement, which meets the requirements of Appendix A of GB 8076-2018;
b) Distilled water;
c) Adhesive sheet and adhesive.
C.4 Test method
C.4.1 Test conditions
Appendix D
(Normative)
Test Method of Alkali-Resistant Tensile Stress Retention
Rate of Strand
D.1 Overview
This method is applicable to the test of alkali-resistant tensile stress retention rate of strand.
During the test, strand basalt fibers with a length of no less than 15 mm are used. For strand
basalt fibers with a length of less than 15 mm, the supplier shall provide homogeneous products
with a length of no less than 15 mm for this item test.
D.2 Apparatus
The apparatus includes:
a) Strength extensometer: precision level 1; the test force value shall be within the range of
20%~80% of the instrument range; strength measurement resolution: 0.001N; lower
clamp descending speed: continuously adjustable; clamp spacing: 1mm~20mm
continuously adjustable;
b) Electrothermal constant temperature blast drying oven: controllable temperature 100℃,
accuracy ±2℃;
c) Water bath: temperature control range (0~100)℃±2℃;
d) Measuring cup: range 1000mL;
e) Storage container with lid and mixer.
D.3 Materials
The materials include:
a) Reference cement, in accordance with the requirements of Appendix A of GB 8076-2018;
b) Distilled water;
c) Adhesive sheet and adhesive.
D.4 Test method
D.4.1 Test conditions
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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