Construction flame retardant materials witness sampling testing range

1. Architectural products: such as marble SLATE, paper plasterboard, cement particleboard, flame-retardant board, sandwich board, rock wool, benzene board, mineral wool board, wallpaper, etc
2. Floor materials: floor, carpet, PVC coil, floor tile, etc
3. Wire and cable: optical cable
4, paint: fire retardant paint
5. Fire performance grading test of insulation materials

Steel structure engineering testing range
1. Ultrasonic inspection of steel structure welding seam
2. Physical properties testing of steel structure materials (yield strength, tensile strength, elongation, bending)
3. Test the bearing capacity of steel structure joints
4. Corrosion protection and fire protection coating test for steel structure (corrosion protection and fire protection coating thickness test)
5. Test the mechanical properties of fastening standard parts and high-strength bolts for mechanical connections of steel structures (test the anti-slip coefficient of friction surfaces, test the torque coefficient and pretension of high-strength bolt joints, test the torque of final twist during construction)
6. Steel structure deformation detection

Construction materials witness sampling range
1. Cement (stability, setting time, strength, fineness)
2. Steel (including welding and mechanical connections) (yield strength, tensile strength, elongation, cold bending, maximum total elongation, weight deviation)
3. Fine aggregate (particle grading, mud content, mud content, density, water content, crushing index)
4. Coarse aggregate (particle grading, mud content, mud lump content, needle flake particle content, crushing index, density, water content)
5. Concrete (mix design, cube compressive strength, consistency, setting time, frost resistance, impermeability, flexural strength, apparent density)
6. Mortar (mix design, compressive strength, consistency, water retention)
7. Brick and block (strength grade, weathering resistance (frost resistance), pan frost, lime burst, density)
8. Ceramic brick (water absorption, thermal shock resistance, frost resistance, bond strength)
9, tile (water absorption, impermeability (impermeability), bearing capacity, frost resistance)
10. Waterproof material (tensile strength, elongation, heat resistance, low temperature bending, impermeability, low temperature flexibility)
11, waterproof coating (solid content, heat resistance, adhesion, tensile properties, heating expansion rate, low temperature flexibility, impermeability)
12. Architectural coating (drying time, water resistance, alkali resistance, washing resistance, temperature and stain resistance)
13. Geoengineering (moisture content, density, maximum dry density, optimal moisture content)
Inspection of prestressed steel strand and anchor fixture
15. Building doors and Windows (wind resistance, air permeability, rain permeability)
16. Pipe fittings (longitudinal shrinkage rate, flat test, tensile yield strength, drop hammer impact test, vica softening temperature, hydrostatic test)
17. Valve (shell and sealing performance, valve maximum allowable pressure, assembly quality)
18. Wire and cable (specification, conductor resistance, cable voltage, insulation resistance, combustion test, insulation wall thickness, voltage resistance test, combustion performance)
19. Switch (appearance quality, creepage distance and electrical clearance, on-off capacity operation)
20. Socket (electric shock protection, insulation resistance, plug pulling force)
21. Polystyrene for insulation (compression strength, apparent density, thermal conductivity, water absorption)
22. External insulation system of expanded polystyrene board thin plastering (thin plastering external insulation system)
23. Thermal insulation materials (thermal insulation materials combustion performance classification (flat plate building materials and products))

Inspection scope of building curtain wall engineering
1. Building curtain wall (air tightness, water tightness, wind pressure deformation, plane deformation)

Construction engineering structure reliability evaluation and testing range
1. Reliability evaluation shall be conducted under the following circumstances:
1) before building overhaul;
2) building reconstruction or capacity increase, reconstruction or expansion;
3) before the change of use or environment of the building;
4) when the building reaches the designed service life and intends to continue to be used;
5) disaster or accident;
6) there are serious quality defects or serious corrosion, damage and deformation.
2. Under the following circumstances, only safety inspection or identification can be conducted:
1) various emergency appraisals;
2) unified inspection of building safety stipulated by national laws and regulations;
3) the temporary housing shall be extended;
4) safety problems are found in usability verification.
3. Usability inspection or verification can only be carried out under the following circumstances:
1) routine inspection of building use and maintenance;
2) buildings have higher comfort requirements.
4. Special verification shall be carried out under the following circumstances:
1) there are special requirements for the maintenance and transformation of the structure;
2) when the durability damage of the structure affects its durability;
3) the structure has obvious vibration influence;
4) the structure needs long-term monitoring.

Building intelligent engineering detection range
1. Construction equipment monitoring system
2. Intelligent integrated system
3. Computer room engineering
4. Integrated wiring system
5, residential (community) intelligent
6. Cable and satellite TV reception system
7. Lightning protection and grounding
Public address system

Main structure engineering field inspection range
1. On-site test of concrete structure strength (rebound method and core drilling method)
2. On-site masonry mortar strength test (rebound method and penetration method)
3. On-site masonry strength test (in situ axial compression method)
4. Thickness test of steel reinforcement protection layer (non-destructive testing)
5. Structural performance test of precast concrete components (deflection, crack resistance, bearing capacity, crack width)
6. Test the tensile bearing capacity of post-anchorage concrete (tensile bearing capacity)
7. Building deformation observation (settlement observation, tilt observation)
8. Structural deformation detection (inclination and crack)

Indoor environment testing range
1. Indoor environmental pollutants (five harmful gas indexes including radon, formaldehyde, ammonia, benzene and TVOC in indoor air)
2. Radon concentration of foundation soil
3. Building materials and decoration materials (formaldehyde and total volatile organic compounds (TVOC) detection in building materials and decoration materials)

Detection range of building energy saving
1. Performance of main components of the insulation system (thermal conductivity, density, moisture content)
2. Performance of exterior wall insulation system (heat transfer coefficient, wind load resistance, impact resistance, bond strength, on-site physical inspection of exterior wall energy-saving structure)
3. Inspection of energy saving of heating residential buildings (indoor and outdoor average temperature detection, heat transfer coefficient of envelope structure, inner surface temperature of thermal bridge, heat consumption per unit heating of buildings, thermal engineering defects)
4. Exterior doors and Windows (air tightness and thermal insulation)
5. Energy conservation project of heating and air-conditioning system (indoor temperature, relative humidity, air volume, water replenishment rate, heat transfer efficiency, water flow of air-conditioning unit, total flow of hot and cold water, total flow of cooling water)
6. Power distribution and lighting energy conservation project (average illumination, lighting power density, low-voltage power supply)
7. Insulating glass (dew point)

1. Cement (stability, setting time, strength, fineness, (masonry cement) water retention rate);

2. Steel (including welding and mechanical connection) (yield strength, tensile strength, elongation, repeated bending, weight deviation, maximum force total elongation, chemical analysis);

3. Fine aggregate (particle gradation, mud content, mud content, density, organic matter content, moisture content);

4. Coarse aggregate (particle gradation, mud content, mud content, needle-like particle content, crushing index, density, organic matter content, moisture content);

5. Concrete (mixture design, cube compressive strength, flexural strength, consistency, setting time, apparent density, frost resistance, impermeability);

6. Asphalt and modified asphalt performance (ductility, softening point, solubility, density and relative density);

7. Asphalt mixture performance (Marshall stability, specimen density, theoretical maximum relative density, Marshall test of asphalt pavement core sample);

8. Subgrade and pavement engineering inspection (thickness, compaction, rebound deflection);

9. Inorganic binder stabilized material properties (compaction test, unconfined compressive strength test, cement dosage);

10. Concrete pavement bricks (compressive strength, flexural strength, frost resistance);

11 Curbs (strength, water absorption, frost resistance).