(1) sampling. The construction unit is responsible for material sampling and specimen making, and the witness is responsible for material sampling and specimen making, and fill in the witness record account.

(2) check. The process of handing over samples from the site to the test unit after sampling.

(3) receiving.

(4) Test report. The test report should be printed by computer, using the unified form of the whole province, and the signature must be handwritten, and there should be a special seal for "witness inspection" in a unified format.

(5) Report collection. If the inspection result is qualified, the construction unit shall receive the report and handle the registration of receipt; If the test result is unqualified, the witness will receive the test report.

Extended data:

According to the Notice on Provisions on Witness Sampling and Inspection of Housing Construction Engineering and Municipal Infrastructure Engineering:

Article 6 The following test blocks, test pieces and materials must be witness sampled and inspected.

(1) Concrete test block of load-bearing structure;

(2) Masonry mortar test block for load-bearing wall;

(3) Samples of steel bars and connecting joints used for load-bearing structures;

(4) Bricks and small concrete blocks for load-bearing walls;

(5) Cement for mixing concrete and masonry mortar;

(6) Admixtures used in concrete for load-bearing structures;

(seven) waterproof materials used in underground, roof, toilet and bathroom;

(eight) other test blocks, test pieces and materials that must be witnessed as stipulated by the state.

Baidu Encyclopedia-Witness Sampling Detection System for Construction Project Supervision