1.0.1 This specification is formulated with a view to making the concrete structures of marine harbour engineering have necessary and good corrosion prevention durability, and achieving advanced technology, economy and rationality, safety and duration, reliable quality and convenient construction.
1.0.2 This specification is applicable to the design and construction for corrosion prevention durability of concrete structures of newly-built marine harbour engineering. The concrete structures of other newly-built offshore engineering may comply with by reference to it.
1.0.3 For the implementation of this specification, necessary inspection and test equipment shall be allocated.
1.0.4 The design and construction for corrosion prevention durability of concrete structures of newly-built marine harbour engineering shall not only meet the requirements of this specification, but also the relevant ones of the current national standard.
2 Terms
2.0.1 Concrete structure and member
The structure made of reinforced concrete, prestressed concrete or plain concrete is the concrete structure; the unit consisting of the concrete structure is the concrete member.
2.0.2 Corrosion prevention durability of concrete structure
Capacity of concrete structure to prevent concrete damage due to reinforcement corrosion within the design working life under normal design, construction, operation and maintenance conditions.
2.0.3 Design working life
Target date of the structure or member used according to the design purpose and service conditions without overhaul.
2.0.4 Corrosion prevention durability design of concrete structure
Process to determine the relevant technical index and various measures according to the service conditions in order to guarantee the concrete structure has the required corrosion prevention durability.
2.0.5 Concrete tension stress limit coefficient αct
Ratio of the tension stress ftc generated by tension edge concrete when the member is in the acted frequent combination (short term effect combination) and the product of the standard value ftk of concrete tensile strength and the plastic influence coefficient γ of concrete in tension zone, namely
2.0.6 Sea water environment
Environment of sea port and estuary port influenced by sea water.
2.0.7 Reference concrete
Concrete for contrast test, without admixtures and additives.
2.0.8 Replacement ratio of cement with fly ash
Mass percentage of cement in reference concrete replaced with fly ash.
2.0.9 Super-substitute technique
Mix proportion design method that makes the mass of the mixed fly ash exceed that of the replaced cement in order to reach the purpose of equal consistency and strength of fly ash concrete and reference concrete.
2.0.10 Silica fume
Dust collected by a dust arrester installation from the silicon steam exhausted via a flue when smelting ferrosilicon or industrial silicon.
2.0.11 High performance concrete
Concrete that is prepared with low water-cement ratio, large high-grade additives and stricter quality control under normal temperature by adopting common material and common process of concrete and has high durability, high dimensional stability, good operation performance and higher strength.
2.0.12 Epoxy resin coated steel bar
Steel bar that the powder made of filling, thermosetting epoxy resin and admixtures such as crosslinking agent is spray coated to preheated steel bar with surface treated through electrostatic spraying process on the strictly controlled plant flow line to make the steel bar form a layer of tough, penetration-free and continuous insulation coating.
2.0.13 Steel bar rust inhibitor
Concrete admixture which is capable of inhibiting electrochemical corrosion of steel bar.
2.0.14 Impregnated concrete surface by silicane
Corrosion prevention measures to impregnate the concrete surface layer with silicane liquid so as to make this surface layer have low water absorption, low chloride penetration ratio and high air permeability.
3 General Requirements
3.0.1 Concrete structures of marine harbour engineering must be subjected to corrosion prevention durability design to guarantee safety and natural service function of concrete structures within the design working life.
3.0.2 For the corrosion prevention durability design of concrete structures, the high-grade concrete with reasonable structure form, good construction and corrosion resistance as well as impermeability shall be selected with respect to structure intended function and environment conditions; for the concrete members in splash area, high performance concrete should be adopted, or special corrosion prevention measures may be adopted simultaneously.
3.0.3 For the members in splash area, the steel bars with good welding performance should be adopted.
3.0.4 Different corrosion prevention requirements and measures shall be proposed to the concrete according to the intended function and environment conditions of concrete structure position. The concrete position may be divided according to water area sheltering conditions and harbour engineering design water level or astronomical tide level in accordance with those specified in Table 3.0.4.
