Frequency and basis of quality inspection for raw materials in water conservancy engineering: 1. Cement 1. Frequency basis: (1) General Portland Cement (GB175-2007); (2) Medium Heat Portland Cement and Low Heat Portland Cement (GB200-2017); (3) Low Heat Micro Expansion Cement (GB2938-2008); (4) Sulfate resistant Portland cement (GB748-2005). (5) Specification for Construction of Hydraulic Concrete (SL677-2014). 2. Testing frequency: every 200-400 tons of the same manufacturer, variety, strength grade, and batch number. 3. Test items and contents: compressive strength and flexural strength at 3d and 28d, fineness, setting time, stability, etc. 2、 Rebar 1. Inspection frequency basis: 1. "Steel for reinforced concrete - Part 1: Hot rolled plain round steel bars" (GB1499.1-2017); 2. Steel for reinforced concrete - Part 2: Hot rolled ribbed steel bars (GB1499.2-2018); 3. "Specification for Construction of Hydraulic Concrete" (SL677-2014). 2. Inspection frequency: every 60t of the same furnace (batch) number and cross-sectional size. 3. Testing items and contents: appearance quality and diameter, tensile strength, yield point, elongation, cold bending, etc. 3、 Admixture 1. Test frequency basis: "Specification for Construction of Hydraulic Concrete" (SL677-2014). 2. Detection frequency: Dosage ≥ 1%: no more than 100t is considered as a batch; Content 0.05% ≤ X< 1%: 50t is a batch; Dosage< 0.05%: 2t is a batch. 3. Test items and contents: water reduction rate, bleeding rate ratio, air content, setting time difference, slump loss, compressive strength ratio. If necessary, inspect the shrinkage ratio, relative durability, and uniformity. 4、 Fly ash 1. Detection frequency basis: "Specification for Construction of Hydraulic Concrete" (SL677-2014). 2. Testing frequency: one batch per 200t for continuous supply of the same type and batch number. 3. Test items and contents: fineness, water demand ratio, ignition loss, water content, etc. 5、 Silicon powder 1. Test frequency basis: "Interim Provisions on Quality Standards for Silicon Powder Used in Hydraulic Concrete" (Water Regulation Science and Technology [1991] No. 10). 2. Testing frequency: Continuous supply of 20t of the same batch number is considered as one batch. 3. Test items and contents: silica content, moisture content, loss on ignition, pozzolanic index, fineness, and uniformity. 6、 Lime 1. Test frequency basis: 1. "Building Quicklime" (JC/T479-2013); 2. "Building Hydrated Lime" (JC/T 481-2013). 2. Inspection frequency: 1 inspection per batch upon arrival. 3. Test items and contents: magnesium oxide+calcium oxide, magnesium oxide, sulfur trioxide, fineness, carbon dioxide (quicklime), slurry production (quicklime), free water (hydrated lime), stability (hydrated lime). 7、 Plastic pipes (1) Unplasticized polyvinyl chloride (PVC-U) pipes for building drainage. 1. Test frequency basis: "Unplasticized polyvinyl chloride (PVC-U) pipes for building drainage" (GB/T5836.1-2006). 2. Testing frequency: Same manufacturer, same specification, same batch number, every 50t batch. 3. Test items and contents: average outer diameter, wall thickness, density, Vicat softening temperature, longitudinal shrinkage, tensile yield strength, and drop hammer impact. （2） Unplasticized polyvinyl chloride (PVC-U) pipes for water supply 1. Test frequency basis: "Unplasticized polyvinyl chloride (PVC-U) pipes for water supply" (GB/T10002.1-2006). 2. Testing frequency: for the same manufacturer, specification, and batch number: Dn ≤ 63mm, one batch every 50t; Dn ≥ 63mm, per 100t batch. 3. Test items and contents: average outer diameter, wall thickness, density, Vicat softening temperature, longitudinal shrinkage rate, drop hammer impact, hydraulic test, hygiene performance (to be conducted when transporting drinking water). （3） Unplasticized polyvinyl chloride (PVC-U) pipes for low-pressure water supply irrigation 1. Test frequency basis: "Unplasticized polyvinyl chloride (PVC-U) pipes for low-pressure water supply irrigation" (GB/T13664-2006). 2. Testing frequency: Same manufacturer, same specification, same batch number, every 30t. 3. Test items and contents: average outer diameter, wall thickness, density, longitudinal shrinkage, tensile yield stress, hydrostatic test, flat test, drop hammer impact. （4） Polyethylene (PE) pipes for water supply 1 Test frequency basis: Polyethylene (PE) Pipeline Systems for Water Supply - Part 2: Pipes GB/T13663.2-2018. 2. Test frequency: One batch every 200t of the same manufacturer, specification, and batch number. 3. Test items and contents: average outer diameter, wall thickness, hydrostatic strength, longitudinal shrinkage, elongation at break, and hygiene performance (when transporting drinking water). (5) Buried polyethylene (PE) structural wall pipelines. 1. Test frequency basis: Polyethylene (PE) structural wall pipeline systems for underground use - Part 1: Polyethylene double wall corrugated pipes (GB/T19472.1-2004). 2. Testing frequency: same manufacturer, same specification, and same batch number: every 60t when the inner diameter is ≤ 500mm; Inner diameter> At 500mm, one batch per 300t. 3. Test items and contents: average outer diameter, wall thickness, ring stiffness, impact performance, ring flexibility, oven test. 8、 Water 1. Detection frequency basis: "Specification for Construction of Hydraulic Concrete" (SL677-2014). 2. Detection frequency: once every 6 months for surface water; Groundwater once a year; Regenerated water once every 3 months. 3. Test items and contents: pH value, insoluble matter, soluble matter, chloride, sulfate, alkali content. 9、 Ordinary hollow anchor rods 1. Testing frequency basis: Technical Conditions for Hollow Anchor Rods (TB/T3209-2008). 2. Testing frequency: One batch per 1000 sets of the same batch number and specification. 3. Testing items and contents: yield strength, tensile strength, yield strength, maximum force, elongation after fracture. 10. Steel wire mesh/gabion cage 1. Testing frequency basis: Engineering Machine-made Steel Wire Mesh and Combination (YB/T4190-2009). 2. Inspection frequency: 1 inspection per batch upon arrival. 3. Testing items and contents: wire diameter, wire tensile strength, wire elongation, and mesh size; The amount of galvanizing and the tensile strength of the mesh shall be in accordance with the design requirements. 11、 Polyethylene foam board 1. Test frequency basis: Technical Specification for Deformation Joints of Concrete Structures in Water Supply and Drainage Engineering (CECS/T117-2017). 2. Inspection frequency: 1 inspection per batch upon arrival. 3. Test items and contents: apparent density, tensile strength, compressive strength, tear strength, hardness, etc. 12、 Geosynthetic materials 1. Test frequency basis: "Technical Specification for Application of Geosynthetic Materials in Hydraulic and Hydroelectric Engineering" (SL/T225-98). 2. Inspection frequency: 1 inspection per batch upon arrival. 3. Test items and contents: unit area mass, thickness, tensile strength, elongation at break, tear strength, and bursting strength; The equivalent pore diameter, permeability coefficient, hydrostatic pressure resistance and aging resistance shall be in accordance with the design requirements

Function of testing report:

1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report

2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms

3. Used as a sales report: issuing legally effective testing reports to make consumers more confident

4. Papers and research: Provide professional personalized testing needs

5. Judicial services: providing scientific, fair, and accurate testing data

6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

100% inspection and testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Testing and testing characteristics:

1. The testing industry is fully covered, meeting different testing needs

2. Fully cover the laboratory and allocate localized testing nearby

3. Engineers provide one-on-one services to make testing more accurate

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6. Short cycle, low cost, and attentive service

7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China