Sampling Specifications for Construction Experiments Standards?

Hello dear<>

Thank you very much for your question. The requirements of the road test sampling specification are; 1.Sampling Locations:

Samples should be taken at a representative part of the test subject to avoid staining or other influences on the sampling site. 2.Sampling Method:

A scientific and accurate sampling method should be used to avoid damage or contamination of the sample during sampling. 3.Number of samples:

The number of samples should be determined according to the test requirements and sample characteristics to ensure that the samples obtained are representative and reliable. 4.Sample preservation:

The samples should be properly stored to avoid contamination or deterioration of the samples, which may affect the test results. The requirements and regulations of Xun Oak are to ensure the accuracy and reliability of road test results, and also to help improve the quality and efficiency of road construction and maintenance. Road test sampling specification is a very important part of road engineering, which involves the accuracy and reliability of road test, which directly affects the quality and efficiency of road construction and maintenance.

With the continuous advancement and development of technology, the road test sampling specifications are also constantly updated and improved to accommodate the application of new materials and technologies. At the same time, the implementation of road test sampling specifications requires the joint efforts and cooperation of all parties, including road construction and maintenance units, test institutions, regulatory departments, etc., to ensure the accuracy and reliability of road tests. I hope my answer can help you, and I wish you a happy life!

1. Raw materials for steel bars: according to GB50204-2015 "Code for Acceptance of Construction Quality of Concrete Structure Engineering": inspection and acceptance shall be carried out in batches, and the weight of each batch shall not be greater than 60T.

Each batch should be composed of steel bars from the same factory, the same furnace number, the same grade, the same specification, the same production process, and the same entry time. The number and method of sampling shall be in accordance with the specified requirements.

2. Steel bar weldments: according to Chapter 5 of JGJ18-2012 "Steel Welding and Acceptance Regulations": quality inspection and acceptance.

Flash butt welding, arc welding, electroslag pressure welding, pneumatic welding, embedded parts T-joint: every 300 joints of the same type (with the level of reinforcement, the same type of joint, the same diameter of reinforcement) as a batch, less than 300 joints, should also be calculated as a batch. (stirrup flash butt welding is 600 for 1 batch, less than 600 is also counted as a batch).

3. Steel bar mechanical connectors: According to Article JGJ107-2016 "Steel Bar Mechanical Connection Regulations": the on-site inspection of joints should be carried out according to the acceptance batch.

Under the same construction conditions, the joints of the same grade, the same form and the same specification of the same batch of materials should be accepted and inspected with 500 as an acceptance batch, and less than 500 should also be accepted as an acceptance batch.

According to the "Concrete Strength Inspection and Evaluation Standards".

The sampling of concrete test blocks and the retention of test blocks shall comply with the following provisions: 1. No more than 100 cubic meters of concrete with the same mix ratio, and sampling shall not be less than once;

2. When the concrete of the same mix ratio is less than 100 trays mixed in each working shift, the sampling shall not be less than once;

3. When a continuous pouring exceeds 1000 cubic meters, sampling is taken every 200 cubic meters; For each floor, the concrete of the same mix ratio shall be sampled not less than once;

4. At least one group of standard curing test blocks should be retained for each sampling, and the number of retention groups for curing test blocks under the same conditions should be determined according to actual needs.

It is not GBT 50152-2012 but GB T 50152-2012 concrete structure test method standard, which is not the content of concrete test block production, etc., but the "Technical Standard for On-site Testing of Concrete Structures", and has been changed to GB T 50784-2013;

Code for the Design of Concrete Structures is not GB 50010-2002, but GB 50010-2010. There is no concrete test block production and maintenance;

The landlord only needs to refer to the 1 5 paragraphs in Article 1 5 of the GB 50204-2002 (2011 Edition) "Code for Construction Quality Acceptance of Concrete Structure Engineering", and the article (impermeability test block).

Standard curing test block: 1000m, a group of every 200m, that is, 8 groups;

Maintenance test block under the same conditions: 3 groups of foundation division (to meet the requirements of non-mathematical statistics), 2 groups of raft foundation retention;

Impermeability test block: one group of indwelling every 500m, and one group of indwelling for every 250-500m in the future; And each project shall not be less than two groups (standard maintenance), 1500m, and 4 groups of liuzhi. (Some local standards require that the impermeability test block under the same condition be indwelled at the same time, and the retention method is the same as the standard maintenance).

Refer to GB50208-2011

The concrete sampling specifications are as follows:

1. For every 100 trays of concrete mixed but not more than 100 cubic meters of concrete with the same mix ratio, the number of sampling times shall not be less than once;

2. When the concrete of the same mix ratio is less than 100 trays mixed in each working shift, the number of sampling shall not be less than once;

3. When a continuous pouring exceeds 1,000 cubic meters, the sampling of concrete with the same mix ratio shall not be less than once every 200 cubic meters;

4. For concrete on the same floor and with the same mix ratio, sampling shall not be less than once;

5. At least one group of standard curing specimens should be retained for each sampling, and the number of retention groups for curing specimens under the same conditions should be determined according to actual needs.

According to the provisions of the "Code for Construction Quality Acceptance of Concrete Structure Engineering", the sampling of concrete impermeability test blocks shall be as follows: for concrete structures with impermeability requirements, the concrete specimens shall be randomly sampled at the pouring site. For the same project and the same mix ratio of concrete, sampling should not be less than once, and the number of retention groups can be determined according to actual needs.

The sampling of steel bars is sent for inspection in batches of every 60 tons, and the tensile and bending of the raw materials are sent for inspection separately.

(1) The cement test should be the same cement plant, the same strength grade, the same variety, the same production time, the same entry date of cement, 400t for an acceptance batch. 500t of bulk cement and 200t of bagged cement are an acceptance batch, and when the tonnage is less than a batch, it is also calculated according to an inspection batch.

2) A group of samples for each acceptance batch, the quantity is 12kg.

3) Sampling should be representative, generally the same amount of samples can be taken from more than 20 different parts or 20 bags, the total number is at least 12kg, and it is divided into two equal parts after mixing, one is tested by the laboratory according to the standard, and one is sealed and stored for re-testing.

4) Construction enterprises should be sampled according to the unit project.

It stands to reason that there are normative provisions, but it still depends on the requirements of supervision, and then asks the laboratory in combination with the requirements of supervision.