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2. The total content of chloride and alkali in concrete and the quality and application technology of admixture in 1 Kunming soil shall comply with the current national standards. It is strictly forbidden to use chloride-containing cement in steel bars, Kunming concrete structures and prestressed concrete structures.
3. In the roadway engineering, the quality of the mineral admixture (admixture) in the concrete should comply with the current national standards.
(1) The variety, specification, quality and performance of steel and steel processing parts must meet the design requirements and specifications.
(2) When steel bars and prestressed steel bars enter the site, the test pieces shall be taken for mechanical property test in accordance with the requirements stipulated by the current national standards, and the quality shall comply with the relevant standards. When it is found that the steel bars are brittle, the welding performance is poor, or the mechanical properties are not normal, the chemical composition inspection or other special tests should be carried out on the batch of steel bars.
(3) The surface of the steel bar must be clean and free of cracks, broken edges and nicks.
(4) For the steel bars with seismic fortification requirements, the strength shall meet the requirements of the current regulations.
(5) The coating quality of the meta-bonded prestressed tendons shall comply with the requirements of the standard for pre-stressed steel strands.
(2) prior to the use of tendons should be visually inspected for prestressed concrete have to be expanded after the smooth, without bending, the surface should be crack, spines, mechanical damage, like oil and iron oxide scale; for The meta-bonded prestressed tendon sheath should be smooth, crack-free, and free of wrinkles.
Quality inspection content and requirements of materials commonly used in mining engineering
(1) Cement and aggregate for concrete (including mineral admixtures)
1. When entering the site, the cement should be inspected for its variety, grade, package or bulk warehouse number, date of manufacture, etc., and its strength, stability and other necessary performance indicators should be re-examined. The quality must conform to the corresponding current national standards. .
(2) Steel bars and steel strands
Main control project
2. General items
(1) The steel bars should be straight and the surface must be free of cracks, oil, granules or flakes.