GB/T 15345-2017 in English
VALIDTest methods of concrete pipes for water transmisson
- Issued on:2017-05-31
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$505.00
《GB/T 15345-2017混凝土输水管试验方法》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
Analysis of the core content of the standard
| Test items | Requirements of the 2003 version | Main changes of the 2017 version |
|---|---|---|
| Scope of application | 4 types of pipes | New UPCP and JCCP, expanded to 6 types |
| Hydrostatic test | General requirements | Detailed PCCP/JCCP special equipment (Appendix A) |
| Protective layer detection | Water absorption test | Changed to water absorption rate test (boiling method) |
Key Technical Points
Appearance Quality Inspection Specifications
The crack width is measured using a reading microscope (division value ≤0.01mm). Two methods are provided for calculating the area of defects such as honeycomb and pockmarks:
- Circular defect: S=πD2/4 (D is the average of the vertical and horizontal values)
- Irregular defect: S=Lmax×(Wmax+Wmin)/2
Key Points for Implementation of Water Pressure Test
| Tube type | Constant pressure time (min) | Pressure gauge requirements |
|---|---|---|
| SCP | 10 (impermeability) | 1.6 level accuracy, measuring range 1.3-1.5 times test pressure |
| PCCP | 5 (cracking resistance) | |
| JCCP | 5 (corner) |
Note: The vertical device pressure gauge should be installed at the bottom to avoid the influence of water column pressure difference.
Comparative analysis of the new and old standards
Main improvements of the 2017 version:
- Appendix A (Instrument List) of the 2003 version has been deleted, and each chapter has been changed to a separate provision
- Newly added Three-point test method (Appendix B) for PCCP external pressure detection
- Added displacement control method (11.4.1) for double rubber ring joint angle test
Suggestions for the implementation of the standard
- The location of the measuring point for geometric dimension detection shall be determined according to 5.3.1, and the ovality of the socket shall be ≤1/12 of the pipe diameter
- The cutting method (Appendix C) is preferred for the protective layer mortar strength test, and the test block requires 28 days of curing
- Arbitration test: the damage method is used for hollowing detection, and the displacement control method is used for double rubber ring angle
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