42 kinds of witness sampling materials, the supervisor must know

First, the physical properties of cement test

1. Sampling frequency: the same cement plant, the same factory, the same factory number and the same strength cement (bulk ≤ 500 tons / batch, bagged ≤ 200 tons / batch).

2. Sampling method: Randomly sample evenly in at least 20 bags of cement in different parts, and after stirring evenly, take 10kg of sample.

Second, the mechanical properties of steel bar raw material test

1. Sampling frequency: the same manufacturer, the same furnace batch number, the same specification, grade, the same delivery status and the same entry time≤60 tons / batch.

2. Sampling method: Each batch of two steel bars is arbitrarily selected to cut two for tensile test, two for cold bending test for a group, and the length is determined by the testing instruments of different laboratories. Sampling length: tensile test is generally 400 ~ 500mm, bending test is generally 350mm.

Third, steel single, double-sided lap welding and electroslag pressure welding test

1. Sampling frequency: In the cast-in-place reinforced concrete structure, 300 steel bars of the same grade and the same type joint should be used as a batch; in the housing structure, 300 steel bars of the same grade and the same type of joint should be used as a batch in no more than two floors, and when there are less than 300 joints, it should still be used as a batch.

2. Sampling method: Each batch of random cut 3 joints for a group, the length according to the testing instruments of different laboratories set. Sampling length: Tensile test is generally 450mm.

Fourth, the steel bar flash butt welding test

1. Sampling frequency: 300 steel welding joints of the same grade and diameter completed by the same welder in the same class as a batch. When the number of joints welded in the same class is small, it can be cumulatively calculated in one week, and the cumulative number is still less than 300 joints, it is still calculated as a batch.

2. Sampling method: random cut from each batch of joints, 3 joints resist pulling 3 joints cold bending into a group.

Fifth, the mechanical connection test of steel reinforcement

1. Sampling frequency: the same model, the same specifications of the joint, 500 as a batch, less than 500 joints are still as a batch.

2. Sampling method: each batch of random cut 3 joints, another 3 steel bars as a base material tensile test for a group, the length according to the testing instruments of different laboratories set.

Sixth, autoclaved aerated concrete block test

1． Sampling frequency: one batch for every 10,000 blocks, less than 10,000 pieces are still used as a batch.

2． Sampling method: According to the center of the expansion direction, a total of 9 specimens are extracted into a group of 9 samples, and each specimen is flat and cut into 100×100×100mm.

Seven, ordinary concrete small hollow block test

1. Sampling frequency: every 10,000 pieces for a batch, less than 10,000 pieces are still a batch.

2. Sampling method: 5 pieces are randomly selected as a group for intensity test.

8. Light aggregate concrete small hollow block test

2. Sampling method: Randomly select 10 blocks into a group.

Nine, autoclaved lime sand brick test

1. Sampling frequency: every 100,000 pieces for a batch, less than 100,000 pieces are still a batch.

2. Sampling method: Randomly select 10 to 20 pieces into a group.

10. Sinter ordinary bricks

1. Sampling frequency: every 35,000 to 150,000 pieces for a batch, less than 35,000 pieces are still a batch.

2. Sampling method: Randomly select 10 pieces for a group for intensity test.

11. Sintered porous bricks

12. Concrete solid bricks

13. Concrete porous bricks

1. Sampling frequency: every 35000-150000 blocks for a batch, less than 35000 blocks are still a batch.

14. Physical test of sand performance

1. Sampling frequency: the same place of origin, the same specification, the same entry time≤ 400m3 / batch or ≤ 600 tons / batch.

2. Sampling method: When sampling, the surface of the sampling site is first eradicated, and then a total of 8 roughly equal sands are evenly extracted from each part to form a group of samples, and the sample weight is about 30kg.

Fifteen, crushed stone performance physical test

2. Sampling method: When sampling the material, the surface of the sampling site is first eradicated, and then a total of 8 parts of roughly equal gravel are evenly extracted from each part to form a group of samples, and the sample weight is about 50kg.

Sixteen, concrete compressive specimen strength test

1. Sampling frequency: each mix of 100 plates and not more than 100 m3 of the same mix of concrete, sampling shall not be less than once; when the same mix of concrete mixed in each work shift is less than 100 plates, sampling shall not be less than once; when a continuous pouring of more than 1000 m3, the concrete of the same mix ratio shall not be taken less than once every 200 m3; the concrete of each floor and the same mix ratio shall not be sampled less than once. For each pouring pile 50m3 must have a set of specimens, less than 50m3 piles, each must have a set of specimens; when the concrete strength of beams, plates and columns differs by two grades, the column head should be separately placed test pieces.

2. Sampling method: Random sampling at the pouring site of concrete, 3 test blocks for a group.

17. Impermeability test of concrete specimens

1. Sampling frequency: When the amount of continuous poured concrete is less than 500 m3, two sets of impermeable specimens should be retained, and two groups should be added for each increase of 250~ 500 m3, such as the raw materials used, the mix ratio or the construction method should be changed, and the test pieces should be retained separately.

2. Sampling method: Random sampling at the pouring site of concrete, 6 test blocks for a group.

18. Anti-folding test of concrete specimens

1. Sampling frequency: every day or paving 200m3 of concrete (airport 400m3), two sets of specimens should be made at the same time, the age period should be 7 days and 28 days respectively; each paving 100m3 ~ 200 m3 concrete should be added a set of specimens, used to check the strength of the later stage, the age period shall not be less than 90 days; the same proportion of concrete mixed per work shift is less than 100 plates, the ready-mixed concrete is less than 100m3, and the sampling shall not be less than once.

Nineteen, mortar specimen compression test

1. Sampling frequency: the same strength level, the same mix ratio, the same raw material mortar, each mixer, each floor or 250m3 masonry sampling at least one group.

2. Sampling method: Randomly select 6 test blocks as a group at the outlet of the mortar mixer.

20. Waterproof material test

1. Sampling frequency: mortar, concrete waterproofing agent per batch of extraction 3 ~ 5kg; polymer cement waterproof coating per 10 tons for a batch, pumping 5kg; PVC elastic waterproof coating per 20 tons for a batch, pumping 30kg; polymer waterproof coating (sheet) per batch of 3 ㎡; polymer waterproof coating (waterstop, expanded rubber) per batch of extraction 2m; polymer waterproofing membrane adhesive per 5 tons for 1 batch, pumping 1L; self-adhesive rubber asphalt waterproofing membrane, Asphalt composite tire flexible waterproofing membrane and PVC waterproof coatings are extracted from each batch of 3 square meters.

2. Sampling method: random sampling at the site.

21. Prestressed steel strand test

1. Sampling frequency: the same steel number, the same specifications, the same production process, every 60 tons for a batch.

2. Sampling method: Cut from the steel hinge line with qualified appearance and size (no arc cutting) 3 strips as a group, and the length is determined according to the detection instruments of different laboratories.

22. Plastic water supply and drainage pipe test

1. Sampling frequency: the same manufacturer, the same material, and no less than one set of plastic drainage pipes of each specification entering the site.

2. Sampling method: Random sampling of plastic water supply and drainage pipes 4×1m, plastic water supply and drainage pipe fittings for a group of 9 pieces.

3. Glue is not less than 500g.

23. Mechanical and electrical performance test of wire and cable

1. Sampling frequency: according to the same manufacturer, the same specifications and models of the number of materials into the base sampling, the number of materials (length) in 10000m and below a sampling group, more than 10000m according to every 20000m sampling group, the total number of samples is not less than two groups.

2. Sampling method: 10mm2 and below are randomly selected from 50m as a group. 10mm2 or more to 50mm2 and below are randomly selected from 20m into a group.

24. Leakage switch protection performance test

1. Sampling frequency: according to the same manufacturer, the same specification of the number of materials into the base sampling, the number of materials (number) in 100 and below a group of samples, more than 100 according to every 100 sampling group, the total number of samples is not less than two groups.

2. Sampling method: Each model randomly draws 3 samples as a group.

25. Building aluminum alloy door and window profile test

1. Sampling frequency: the same supplier, the same variety of models, in 1000 ㎡ doors and windows and below for one batch, in 2000 ㎡ doors and windows and above for two batches.

2. Sampling method: Each model randomly draws 2 1m samples into a group.

26. Civil engineering compaction test

1. Sampling frequency: a group of samples per 20 to 50 square meters for the backfill of the foundation pit; a group of samples for each layer of the base trough or pipe ditch according to the length of 20 to 50 m; a group of samples of 100 to 500 square meters per layer of indoor fill; a group of samples of 400 to 900 square meters per floor of the flat filling of the housing construction site.

2. Sampling method: testing personnel on-site sampling.

27. Municipal engineering compaction test

1. Sampling frequency: Luqi: 3 points per 1000 ㎡ sampling; stable layer, cushion layer: 1 point per 1000 ㎡ sampling; drainage engineering: rainwater, sewage respectively, each well section, each layer (30cm thick) sampling 3 points.

28. Mortar mix ratio test

1. Sampling frequency: each different mix ratio test a group, when the composition of the material changes, should be re-tested a group.

2. Sampling method: random extraction of mortar compressive strength, rainwater, sewage well masonry for every 3 sections of wells to take a group of mortar samples.

29. Concrete mix ratio test

2. Sampling method: random sampling of mortar mix ratio required materials, the number is determined according to the requirements of different laboratories.

30. Prestressed anchor test

1. Sampling frequency: the same material and the same production process, no more than 200 sets for a batch. 5% of the anchors are extracted from each batch, but not less than 5 sets are used for hardness testing.

2. Sampling method: 5% of the anchors are randomly selected on the spot, but not less than 5 sets.

31. Test of steel strand assembly parts of prestressed anchors

1. Sampling frequency: the same material and the same production process, no more than 200 sets for a batch. 5 sets of anchors were extracted from the same batch.

2. Sampling method: Randomly select 5 sets of anchors into a group.

32. Standard strike test

1. Sampling frequency: the same composition material is not less than 1 group, and the composition material of the structural layer is redone when there is a change (not less than 1 group).

2. Sampling method: random sampling of 25kg with maximum particle size below 25mm, random sampling of 50kg with maximum particle size of more than 25mm.

33. Graded gravel cooperation test

2. Sampling method: Random sampling of graded gravel required materials of about 20kg.

Thirty-four, no side limit pressure test

1. Sampling frequency: stable fine-grained soil, each work section or every 2000 square meters to make 6 specimens for a group; stable medium grain soil and coarse-grained soil, each operation section or every 2000 square meters to make 9 specimens for a group.

2. Sampling method: Random sampling on site immediately sent to the laboratory for molding.

35. Plasticity index inspection test

1. Sampling frequency: once every 1000 square meters, check at any time when abnormal.

2. Sampling method: about 5kg sample is randomly sampled on the spot.

36. Bending and sinking test

1. Sampling frequency: 40 to 50 measurement points per vehicle road per assessment section (no more than 1000m).

2. Sampling method: on-site detection by inspectors

37. Finish brick drawing test

1. Sampling frequency: 3 pieces of similar wall finish bricks per 300 square meters are a group, each floor shall not be less than 1 group, and less than 300 square meters of similar wall finish bricks will be extracted every two floors for a group.

2. Sampling method: The spacing of each group of 3 finish bricks adjacent to each other should be greater than 50cm, and the pasting age of the finish bricks must be greater than 28 days.

Thirty-eight, asphalt three major indicators test

1. Sampling frequency: 100 tons / batch.

2. Sampling method: about 5kg is randomly selected as a group on the spot.

Thirty-nine, asphalt with fine aggregates, coarse aggregates, ore powder test

1. Sampling frequency: the same batch is inspected at least once before use.

2. Sampling method: random sampling on site, the number is determined according to the requirements of different laboratories.

40. Asphalt compaction degree (core extraction) test

1. Sampling frequency: 2000㎡ / point for different structural layers, at least 3 points.

2. Sampling method: on-site detection by inspectors.

41. Asphalt standard density (Marshall) test

1. Sampling frequency: different mix ratios/groups.

42. Geotextile and geogrid test

1. Sampling frequency: 500 volumes/group.

2. Sampling method: Randomly select about 5m long into a group.

The content of the article comes from the Internet, if there is infringement, please contact to delete.

Pay attention to the "Ai Sanwei Technology" WeChat public account and watch the live broadcast! Get a free 7-day free trial of BIM software and 12 BIM software tutorial series, as well as wonderful cases, BIM solutions, and send them regularly!