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Summary of test sampling of various materials at construction site

Release time: August 19, 2020 popularity: eight

1 cement physical property test

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

2. Sampling method: evenly sample at least 20 bags of cement in different parts at random. After mixing evenly, take 10 kg sample.

2 mechanical property test of steel bar raw material

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

2. Sampling method: two steel bars are randomly selected from each batch for tensile test, and two bars are used for cold bending test as a group, and the length is determined according to the detection instruments in different laboratories.

Single and double lap welding and electroslag pressure welding test of 3 steel bar

1. Sampling frequency: in the cast-in-place reinforced concrete structure, 300 steel bars and joints of the same type shall be taken as a batch; in the building structure, 300 steel bars and joints of the same type in no more than two floors shall be regarded as a batch, and when less than 300 joints, they shall still be regarded as a batch.

According to the different test methods, each test room was randomly divided into two groups.

Flash butt welding test of 4 steel bar

1. Sampling frequency: 300 welded joints of the same brand and diameter completed by the same welder in the same shift shall be regarded as a batch. When the number of joints welded in the same shift is small, it can be accumulated within one week. If there are still less than 300 joints, it is still calculated as one batch.

2. Sampling method: randomly cut from each batch of joints, tensile strength of 3 joints and cold bending of 3 joints into a group.

5 steel bar mechanical connection test

1. Sampling frequency: 500 joints of the same model and specification shall be taken as a batch, and less than 500 joints shall be regarded as a batch.

2. Sampling method: three joints are randomly cut from each batch, and another three steel bars are taken as the base material for tensile test as a group, and the length is determined according to the testing instruments in different laboratories.

Test of autoclaved aerated concrete block

1. Sampling frequency: every 10000 pieces is a batch, and less than 10000 pieces are still regarded as a batch.

2. Sampling method: according to the center of expansion direction, a total of 9 samples are taken as a group, and each sample is cut into 100 × 100 × 100 mm.

Test on small hollow block of ordinary concrete

1. Sampling frequency: every 10000 pieces is a batch, and less than 10000 pieces are still regarded as a batch.

2. Sampling method: 5 pieces were randomly selected as a group.

Test of 8 lightweight aggregate concrete small hollow block

1. Sampling frequency: every 10000 pieces is a batch, and less than 10000 pieces are still regarded as a batch.

2. Sampling method: 10 pieces were randomly selected as a group.

9 autoclaved lime sand brick test

1. Sampling frequency: every 100000 pieces is a batch, and less than 100000 pieces are still regarded as a batch.

2. Sampling method: 10 ~ 20 pieces were randomly selected as a group. Depending on the requirements of each laboratory.

Physical test on properties of 10 fine aggregate

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

2. Sampling method: in the process of sampling, the surface of the sampling part shall be removed first, and then approximately equal amount of sand shall be extracted from each part to form a group of samples with the weight of about 30 kg.

11 physical test of gravel performance

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

2. Sampling method: in the process of sampling, the surface of the sampling part shall be removed first, and then approximately equal amount of sand shall be extracted from each part to form a group of samples with the weight of about 50 kg.

12 strength test of concrete compression specimen

one Sampling frequency: the sampling frequency shall not be less than once for every 100 plates of concrete with the same mix proportion and no more than 100 m3; the sampling shall not be less than once when the concrete of the same mix proportion is less than 100 plates; the sampling shall not be less than once per 200 m ~ 3 of concrete with the same mix proportion when the concrete of the same mix proportion is poured continuously for more than 1000 m ~ 3; the sampling shall be conducted for the concrete of each floor and the same mix proportion Not less than once.

For the cast-in-place pile, there must be a group of test pieces for every 50m 3 of cast-in-place pile, and each pile with less than 50m3 must have a group of test pieces; when the concrete strength of beam, slab and column is different by two grades, the test piece shall be left at the column head separately.

2. Sampling method: randomly take samples from the concrete pouring site, and make 3 test blocks as a group.

Impermeability test of 13 concrete specimens

1. Sampling frequency: when the continuous pouring amount of concrete is less than 500 m3, two groups of impermeable test pieces shall be retained. For each 250 ~ 500m3 increase, two groups shall be added. If the raw materials, mix proportion or construction method are changed, the test pieces shall be retained separately.

2. Sampling method: randomly sampling and manufacturing at the concrete pouring site, 6 test blocks as a group.

14 flexural test of concrete specimen

one Sampling frequency: two groups of test pieces should be made at the same time every day or when paving 200m3 concrete (Airport 400m m3). The age should be 7 days and 28 days respectively. A group of test pieces should be added for each 100m3 ~ 200m ~ concrete paving to check the later strength, and the age should not be less than 90 days. If there are less than 100 discs of concrete of the same proportion mixed in each work shift, and the ready mixed concrete is less than 100m3, the sampling shall not be less than once.

2. Sampling method: randomly take samples from the concrete pouring site, and make 3 test blocks as a group.

Compressive test of 15 mortar specimen

1. Sampling frequency: at least one group of mortar with the same strength grade, the same mix proportion and the same raw materials shall be sampled from each mixer, each floor or 250m3 masonry.

2. Sampling method: six test blocks are randomly selected from the outlet of mortar mixer as a group.

16 waterproof material test

1. Sampling frequency: 3-5 kg for mortar and concrete waterproof agent; 5 kg for every 10 tons of polymer cement waterproof coating; 30 kg for every 20 tons of PVC elastic waterproof coating;

3 m2 for each batch of polymer waterproof coating (sheet); 2 m for each batch of polymer waterproof coating (waterstop and expanded rubber); 1 l for every 5 tons of polymer waterproof membrane adhesive; 3 m2 for each batch of self-adhesive rubber asphalt waterproof membrane, asphalt composite tire flexible waterproof membrane and polyvinyl chloride waterproof coating.

2. Sampling method: random sampling on site.

17 prestressed steel strand test

1. Sampling frequency: take the same steel grade, the same specification, the same production process, every 60 tons as a batch.

2. Sampling method: cut 3 pieces from the steel hinge line with qualified appearance size (arc cutting is not allowed) as a group, and the length is determined according to the detection instruments in different laboratories.

18 plastic water supply and drainage pipe test

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

2. Sampling method: randomly select 4 × 1m plastic water supply and drainage pipes and 9 plastic water supply and drainage pipes as a group.

3. Glue not less than 500g.

19 mechanical and electrical performance test of wire and cable

1. Sampling frequency: the sampling frequency is based on the number of materials of the same manufacturer and the same specification and model. One group is sampled when the material quantity (length) is less than 10000m, and one group is sampled every 20000m above 10000m, and the total number of samples is not less than two groups.

2. Sampling method: a group of 50m was randomly selected from the area of 10mm2 and below. A group of 20 m ~ 2 m ~ 2 ~ 50 m ~ 2 was randomly selected as a group.

20 leakage switch protection performance test

1. Sampling frequency: the sampling shall be based on the number of materials from the same manufacturer and the same specification and model. If the number of materials (number) is 100 or less, one group shall be sampled. If more than 100 pieces are sampled, one group shall be sampled for every 100 pieces, and the total number of samples shall not be less than two groups.

2. Sampling method: three samples of each model were randomly selected as a group.

Test of 21 aluminum alloy door and window profiles

1. Sampling frequency: the same supplier, the same variety and model, a batch of 1000 m2 doors and windows and below, and two batches of 2000 m2 doors and windows and above.

2. Sampling method: two 1m samples of each model were randomly selected as a group.

22 compaction test of Civil Engineering

1. Sampling frequency: one group is sampled for each 20 ~ 50m2 of foundation pit backfill; one group is sampled for each layer of foundation trench or pipe trench backfill; one group is sampled for each layer of indoor filling according to 100 ~ 500m2; one group is sampled for each layer of leveling and filling of housing construction project, and one group is sampled for each layer of 400 ~ 900m2.

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

23 compaction test of Municipal Engineering

1. Sampling frequency: subgrade: 3 points per 1000 m2; stable layer and cushion layer: 1 point per 1000 m2; drainage engineering: 3 points for each well section and each layer (30cm thick) for rainwater and sewage.

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

Mix proportion test of 24 mortar

1. Sampling frequency: one group shall be tested for each different mix proportion, and another group shall be tested again when the composition of materials changes.

2. Sampling method: the compressive strength of mortar is randomly selected. One group of mortar samples are taken for each 3 sections of rainwater and sewage well masonry.

25 concrete mix proportion test

1. Sampling frequency: one group shall be tested for each different mix proportion, and another group shall be tested again when the composition of materials changes.

2. Sampling method: materials required for mortar mix proportion shall be randomly selected, and the quantity shall be determined according to the requirements of different laboratories.

Prestress test of anchorage 26

Sampling frequency of different batches is more than 200. Take 5% of the anchorages from each batch, but not less than 5 sets for hardness test.

2. Sampling method: random sampling 5% of the anchorage, but not less than 5 sets.

Test of 27 prestressed anchorage steel strand assembly

1. Sampling frequency: no more than 200 sets of the same material and production process shall be taken as a batch. Five sets of anchorages were selected from the same batch.

2. Sampling method: five sets of anchors were randomly selected as a group.

28 standard compaction test

1. Sampling frequency: no less than one group of the same composition materials, and repeat when the composition materials of the structural layer change (no less than 1 group).

2. Sampling method: 25 kg is randomly selected for the particle size below 25 mm and 50 kg for the particle size above 25 mm.

Mix test of 29 graded crushed stone

1. Sampling frequency: no less than one group of the same composition materials, and repeat when the composition materials of the structural layer change (no less than 1 group).

2. Sampling method: About 20kg of graded crushed stone materials are randomly selected.

30 unconfined pressure test

1. Sampling frequency: for stabilized fine-grained soil, 6 specimens are made for each operation section or every 2000 m2; for stabilized medium grained soil and coarse-grained soil, 9 specimens are prepared for each operation section or 2000 m2 as a group.

2. Sampling method: after random sampling on site, it shall be sent to the laboratory for molding immediately.

31 plasticity index test

1. Sampling frequency: once every 1000 m2, and inspect at any time in case of abnormality.

2. Sampling method: about 5 kg samples were randomly selected on site.

32 deflection test

1. Sampling frequency: 40-50 measuring points per vehicle road for each evaluation section (no more than 1000m).

2. Sampling method: on site inspection by inspectors.

Pull out test of 33 facing brick

1. Sampling frequency: each 300 m2 of similar wall facing brick is a group, each floor should not be less than 1 group, less than 300 m2 of similar wall facing brick every two floors as a group.

2. Sampling method: the distance between three facing bricks in each group should be greater than 50cm, and the pasting age of facing bricks must be more than 28 days.

Test on three indexes of 34 asphalt

1. Sampling frequency: 100 tons / batch.

2. Sampling method: about 5 kg was randomly selected as a group.

Test of fine aggregate, coarse aggregate and mineral powder for asphalt

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

2. Sampling method: random sampling on site, and the quantity shall be determined according to the requirements of different laboratories.

36 asphalt compactness (core pulling) test

1. Sampling frequency: 2000 m2 / point for different structural layers, at least 3 points. 2. Sampling method: on site inspection by inspectors.

37 standard density (Marshall) test of asphalt

1. Sampling frequency: different mix proportion / group.

2. Sampling method: random sampling on site, and the quantity shall be determined according to the requirements of different laboratories.

38 test of geotextile and geogrid

1. Sampling frequency: 500 rolls / group.

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

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