GB/T 23265-2023 in English
VALIDChopped basalt fiber for cement concrete and mortar
- Issued on:2023-05-23
- Implemented on:2023-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
$447.00
《GB/T 23265-2023水泥混凝土和砂浆用短切玄武岩纤维》由TC197（全国水泥制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
Background of Standard Revision and Technological Evolution
This revision is the first major update of GB/T 23265 standard since its first release in 2009, which mainly reflects the three development stages of basalt fiber application technology:
| Technical stage | Features of 2009 version | Improvements of 2023 version |
|---|---|---|
| Performance indicators | Focus on basic mechanical properties | Added durability indicators such as bending toughness and impact strength ratio |
| Test methods | 6 basic tests | 5 normative appendices added, the test system is more complete |
| Application classification | Single function classification | Refined into two categories: crack prevention and crack resistance (BF/BSF) and toughening and reinforcement (BZ) |
Analysis of core technical requirements
4.1 Product classification system
The standard establishes a three-dimensional classification matrix:
- Fiber morphology: original yarn bundle (S type) and plied yarn (T type)
- Application scenarios: concrete (BF/BZ) and mortar (BSF)
- Functional positioning: crack prevention and crack resistance and toughening and reinforcement
6.3 Key performance indicators
Typical case: When BZ fibers are used in a bridge project, their tensile strength must be ≥1500MPa, elastic modulus ≥35GPa, and the strength retention rate must still remain above 65% after alkali treatment.
| Core Index Comparison | S-type fiber | T-type fiber | |
|---|---|---|---|
| Mechanical properties | Tensile strength | ≥1250MPa | ≥1250MPa |
| Elastic modulus | ≥30GPa | - | |
| Elongation at break | ≤5.0% | ||
| Alkali resistance | ≥50% | ≥65% | |
Implementation points and engineering suggestions
Principles of material selection
- Length matching: 12-30mm fiber for concrete, 3-15mm for mortar
- Diameter control: single filament diameter deviation ≤±10%, twisted yarn acceptance according to the indicated value
- Dosage optimization: refer to the manufacturer's recommendation, usually 0.5-2kg/m³
Construction quality control
Common problems: Insufficient mixing time caused fiber agglomeration in a subway project, which was later adjusted to the process of dry mixing for 30 seconds + wet mixing for 90 seconds, which significantly improved the dispersion uniformity.
Acceptance inspection process
| Inspection type | Item | Sampling quantity | Judgment basis |
|---|---|---|---|
| Factory inspection | 5 items such as appearance and size | 1kg/batch | Chapter 6 Basic requirements |
| Type inspection | All items inspection | S type 2kg, T type 10kg | Technical consistency verification |
Test method innovation
The 5 newly added normative appendices in the standard constitute a complete test system:
- Appendix A: Tensile test of plied yarn class=instrument>Pattern reinforcement method, solve the problem of short fiber clamping
- Appendix E: Using Energy absorption value to evaluate bending toughness, which is more in line with engineering practice
- Appendix C/D: 80℃ alkali solution accelerated aging method to simulate long-term durability
Test points: During the alkali resistance test, it is necessary to pay attention to the pH value of the cement clear solution should be ≥12.5, and it needs to be fully rinsed with distilled water after soaking to avoid the influence of residual alkali.
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