1 General
1.0.1 This standard is formulated with a view to unifying the technical requirements for the quality control of concrete for port and waterway engineering, achieving advanced technology and economic rationality, as well as ensuring the quality.
1.0.2 This standard is applicable to the quality control of the ordinary concrete in the permanent hydraulic structures for the port and waterway engineering, not applicable to the concrete made of special materials by particular processes.
1.0.3 Necessary inspection and test equipment shall be arranged and the technical management and quality control systems shall be established during the quality control of concrete for port and waterway engineering.
1.0.4 In addition to complying with this standard, the quality control of concrete for port and waterway engineering shall comply with the relevant ones of the nation.
2 Terminology
2.0.1 Marine environment
The environment where the waterway engineering structures affected by sea water in.
2.0.2 Cementitious material or binder
The generic term of active mineral additives used to prepare concrete cement or cement and fly ash, ground granulated blast furnace slag powder and silica fume etc.
2.0.3 Water to binder ratio
The ratio of water content in unit volume used to prepare concrete to the total amount of cementitious material or binder in unit volume.
2.0.4 Resistance of concrete to chloride penetration
The index of difficult degree of chloride in the environment penetrating into concrete.
2.0.5 Manufactured-sand
Rock particles, nominal particle size less than 5.00mm, formed through dust removal treatment, mechanical disruption and screening of non- soft shale and weathered rock.
2.0.6 Mixed sand
Sand mixied from manufactured-sand and natural sand in certain proportion.
2.0.7 Mass concrete
The concrete estimated to lead to crack caused by concrete temperature change because of such factors as hydration heat of cementitious material or binder, or the concrete whose minimum dimension of structure section is equal to or larger than 1m.
2.0.8 Plain concrete structure
The concrete structure without reinforcement or only be arranged with constructional reinforcement but without stressed reinforcement.
3 Basic Requirements
3.1 Concrete Mixture
3.1.1 The following contents of concrete mixture shall be inspected:
(1) The consistency of concrete mixture;
(2) The consistency loss of flowing and high flowing concrete mixture;
(3) Concrete proportion, constituent materials, mixing equipment, uniformity of concrete mixture when mixing time is changed;
(4) Air content of concrete mixture with frost resistance requirements;
(5) Chloride ion content of concrete mixture used in marine environment;
(6) The temperature of concrete mixture with temperature control requirements.
3.1.2 The consistency of concrete mixture should be is expressed as slump or Vebe consistency, and the inspection method shall meet the relevant requirements of the current professional standard "Testing Code of Concrete for Port and Waterway Engineering”(JTJ 270).
3.1.3 Plastic and flowing concrete mixture should be classified into 4 grades according to its slump size, and shall meet the requirements specified in Table 3.1.3.
Contents
1 General
2 Terminology
3 Basic Requirements
3.1 Concrete Mixture
3.2 Concrete Strength
3.3 Durability Requirements for Concrete
4 Quality Control of Concrete Constituent Materials
4.1 General Requirements
4.2 Cement
4.3 Additives
4.4 Fine Aggregate
4.5 Coarse Aggregate
4.6 Mixing Water
4.7 Admixtures
5 Control of Concrete Proportion
5.1 General Requirements
5.2 Pumped Concrete
5.3 Frost-Resistant Concrete
5.4 Mass Concrete
5.5 Underwater Concrete
5.6 Non-Dispersible Underwater Concrete
6 Quality Control of Concrete Construction Process
6.1 Batching
6.2 Mixing
6.3 Transportation
6.4 Pouring
6.5 Curing
7 Quality Control of Hardened Concrete
7.1 Concrete Appearance Quality
7.2 Concrete Strength
7.3 Concrete Durability
7.4 Treatment of Concrete Quality Problems
Appendix A Standard Test Method for the Resistance of Concrete to Chloride Penetration--Electric Flux Method
A.1 Application Scope
A.2 Test Equipment and Reagents
A.3 Test Procedures
A.4 Calculation of Results
Appendix B Explanation of Wording in This Standard
Additional Explanation
