Urban development management organization
People's Republic of China (PRC) (China) Industry Standard
JGJ××-200×
Technical specification for application of sea sand concrete
Technical specification for sea sand concrete
(Draft for Comment)
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Issued by the Ministry of Housing and Urban-Rural Development of the People's Republic of China
People's Republic of China (PRC) (China) Industry Standard
Technical specification for application of sea sand concrete
Technical specification for sea sand concrete
Approved by: Ministry of Housing and Urban-Rural Development of the People's Republic of China
Implementation date: 200 ××× day.
China Building Industry Press
200× Beijing
order
According to the Notice of the Ministry of Housing and Urban-Rural Development on Printing and Distributing (Ministry of Housing and Urban-Rural Development [2008] 102), the compilation team conducted extensive investigation and study, conscientiously summed up practical experience, and made this specification on the basis of extensive consultation with relevant international standards and advanced foreign standards.
The main technical contents of this specification are: 1 general; ② terminology; 3. Basic provisions; 4 raw materials; 5. Performance of sea sand concrete; 6. Mixed design; 7 architecture; 8 quality inspection and acceptance.
This specification is under the centralized management of the Ministry of Housing and Urban-Rural Development, and the specific technical content is interpreted by China Institute of Building Science. If you have any comments or suggestions during the implementation, please send them to the Standard Management Group of Technical Specifications for the Application of Sea Sand Concrete (address: No.30, North Third Ring Road, Beijing, postal code:100013; Email: cabrcrete @ vip. 163.com).
Editor-in-chief of this specification: China Institute of Building Research and Zhejiang Zhonglian Construction Group Co., Ltd.
Participating units of this specification:
Main drafters of this specification:
This specification is mainly reviewed by the following personnel:
order
1 General 1
2 Terminology 2
3 Basic clause 3
4 raw materials 4
4. 1 haisha 4
4.2 Other raw materials 5
5 sea sand concrete performance 6
5. Technical requirements of1mixture 6
Mechanical properties 6
5.3 Long-term Performance and Durability 6
6 Mix proportion design 8
6. 1 Basic Requirements 8
6.2 Mix proportion design step 9
6.3 Determination of Preparation Strength 9
6.4 mixture ratio calculation 10
6.5 Matching, Adjustment and Determination 10
7 architecture 12
7. 1 general provisions 12
7.2 Preparation of Sea Sand Concrete 12
7.3 Transportation, Pouring and Maintenance of Sea Sand Concrete 12
8 Quality Inspection and Acceptance 13
8. 1 quality inspection of concrete raw materials 13
8.2 Performance test of concrete mixture 13
8.3 Performance test of hardened concrete 14
8.4 acceptance of concrete works 14
Description of words used in this standard 15
List of reference standards 16
Description of terms 17
content
1 general provisions
2 clause 2
3 Basic requirements 3
4 raw materials 4
4. 1 haisha 4
4.2 Other raw materials 5
5 sea sand concrete performance 6
Technical requirements for mixtures 6
5.2 Mechanical Properties 6
5.3 Long-term Performance and Reliability 6
6 Mixed design 8
6. 1 Basic Requirements 8
6.2 Mix Design Procedure 9
6.3 Determination of mixing strength 9
6.4 mixture ratio calculation 10
6.5 Trial mixing and adjustment and determination of mixture ratio 10
7 architecture 12
7. 1 general requirements 12
7.2 Mixing of sea sand concrete 12
7.3 Transportation, Pouring and Maintenance of Sea Sand Concrete 12
8 Quality Inspection and Acceptance 13
8. 1 quality inspection of concrete raw materials 13
8.2 Performance test of concrete mixture 13
8.3 Performance test of hardened concrete 14
8.4 acceptance of concrete works 14
Interpretation of wording in this specification 15
List of normative standards 16
Interpretation of terms 17
1 general rules
1.0. 1 This specification is formulated to standardize the application of sea sand concrete in construction projects and ensure the engineering quality.
1.0.2 This specification is applicable to the design, construction, quality inspection and acceptance of marine sand concrete in construction projects.
1.0.3 the application of sea sand concrete shall comply with the provisions of this specification and the current relevant national standards.
2 terminology
2.0. 1 sea sand
Sand produced in the ocean, including beach sand and seabed sand. This specification refers to the purified sea sand that meets the technical requirements of this specification.
Beach sand
Sand on the beach.
Submarine sand
Sand in shallow sea or deep sea bottom.
2.0.4 Sea sand concrete
Concrete with sea sand as fine aggregate.
3 Basic clauses
3.0. 1 sea sand must be purified and meet the requirements of this specification before it can be used to prepare concrete.
3.0.2 Sea sand concrete shall not be used for prestressed concrete structures.
3.0.3 When preparing sea sand concrete, seabed sand should be used and artificial sand should be mixed.
3.0.4 Alkali-free activated sea sand should be used for preparing concrete.
3.0.5 In the production process of sea sand concrete, chloride ion content in concrete should be detected.
4 raw materials
4. 1 haisha
4. 1. 1 The grain size distribution of sea sand shall meet the requirements in Table 4. 1. 1. Area Ⅱ sand should be selected for concrete preparation, and medium sand with fineness modulus of 2.3~3.0 should be selected for pumping concrete preparation.
Table 4. 1. 1 sea sand particle gradation
Zone 1, Zone 2 and Zone 3
4.75mm10 ~ 010 ~ 010 ~ 0.
2.36 mm 35~5 25~0 15~0
1.18mm 65~35 50~ 10 25~0
600 μm 85 ~ 7 1 70 ~ 4 1 40 ~ 16
300μm 95~80 92~70 85~55
150 μm 100 ~ 90 100 ~ 90 100 ~ 90
Note: Compared with the figures listed in the table, except for 4.75mm and 600μ m screens, the actual particle size distribution of sand can be slightly exceeded, but the total amount of excess should be less than 5%.
4. 1.2 The quality requirements of sea sand shall comply with the provisions in Table 4. 1.2. The test method for quality inspection of sea sand shall conform to the current industry standard "Standard for Quality and Inspection Methods of Sand and Stone for Ordinary Concrete" JGJ 52.
Table 4. 1.2 Quality Requirements of Sea Sand
Project index
Chloride ion content (%) ≤ 0.03
Mud content (%) ≤ 1.0
Clay content (%) ≤ 0.5
Robustness index (%) ≤ 8
Mica content (mass %)≤ 1.0
Light matter content (mass %)≤ 1.0
Sulfide and sulfate content (%), calculated by SO3 mass) ≤ 1.0
The content of organic matter meets the requirements of JGJ52.
4. 1.3 The alkali activity of sea sand should be tested according to the current national standard "Building Sand" GB 14684. Technical measures should be taken to prevent alkali-aggregate reaction when using sea sand with potential alkali activity.
4. 1.4 The maximum size of shells in sea sand should not exceed 4.75 mm ... The shell content should comply with the provisions in Table 4. 1.4. For concrete sand with frost resistance, impermeability or other special requirements less than or equal to C25, its shell content should not be greater than 5%.
Table 4. 1.4 Shell content in sea sand
Concrete strength grade ≥C40 C35~C30 C25~C 15
Shell content (mass percentage) ≤ 3 ≤ 5 ≤ 8.
4. 1.5 The radioactivity of sea sand shall conform to the current national standard "Radionuclide Limit of Building Materials" GB 6566.
4.2 Other raw materials
4.2. 1 Sea sand concrete should be used for ordinary portland cement. Cement should comply with the current national standard "General Portland Cement" GB 175, and the chloride ion content should not be greater than 0.06%.
4.2.2 Mineral admixtures such as fly ash, granulated blast furnace slag powder and silica fume should be used for sea sand concrete, and the fly ash should not be lower than Grade II, and the granulated blast furnace slag powder should not be lower than S95. Quality of fly ash, granulated blast furnace slag powder, silica fume, etc. It shall meet the relevant provisions of Fly Ash for Cement and Concrete GB/T 1596, Granulated Blast Furnace Slag Powder for Cement and Concrete GB/T 18046 and Technical Specification for Application of Mineral Admixtures GB/T XXX respectively.
4.2.3 Coarse aggregate and fine aggregate except sea sand shall comply with the relevant provisions of the current industry standard "Standard for Quality and Inspection Methods of Sandstone for Ordinary Concrete" JGJ 52.
4.2.4 The water used for sea sand concrete shall conform to the current industry standard "Standard for Water Use for Concrete" JGJ 63, and the chloride ion content of mixed water shall not exceed 500 mg/L. ..
4.2.5 Polycarboxylic acid water reducer should be adopted for sea sand concrete, and its quality should comply with the current industry standard "Polycarboxylic acid High Performance Water Reducer" JG/T 223; Other admixtures shall comply with GB 8076 of Concrete Admixtures and GB 50 1 19 of Technical Specification for Application of Concrete Admixtures.
4.2.6 When sea sand concrete is used in reinforced concrete engineering, steel bar rust inhibitor can be added, and it shall conform to the current industry standard "Technical Specification for Application of Steel Bar Rust Inhibitor" JGJ ××.
4.2.7 Admixtures should have good compatibility with cement and sea sand. Admixtures can be compatible with cement and sea sand. Sea sand and standard sand can be used respectively, and the comparative test can be carried out according to the workability test method of cement mortar in the current national standard "Homogeneity test method of concrete admixture" GB/T 8077.
5 sea sand concrete performance
5. 1 technical requirements of mixture
5. 1. 1 sea sand concrete mixture should have good cohesiveness and water retention, without segregation and bleeding.
5. 1.2 The slump of sea sand concrete should meet the engineering design and construction requirements; The slump loss of pumped sea sand concrete should not be greater than 30 mm/h, and the slump test method of sea sand concrete should comply with the current national standard "Standard for Performance Test Methods of Ordinary Concrete Mixtures" GB/T 50080.
5. 1.3 The setting time of sea sand concrete should meet the construction requirements, and the setting time of mortar should be compared with standard sand according to the current national standard "Standard for Testing Methods of Basic Performance of Building Mortar" JGJ/T 70, and the setting time difference of mortar should not be greater than 30min.
5. 1.4 The chloride ion content of sea sand concrete mixture should not be greater than the provisions in Table 6. 1.5 of this specification. The determination of chloride ion content in sea sand concrete mixture should adopt the rapid determination method of chloride ion content in concrete mixture in JTJ 270, the current industry standard.
5.2 Mechanical properties
5.2. 1 The standard value of strength, design value of strength, elastic modulus, axial compressive strength, axial tensile fatigue strength and design value of fatigue deformation modulus of sea sand concrete shall comply with the current national standard "Code for Design of Concrete Structures" GB 500 10.
5.2.2 The compressive strength of sea sand concrete shall be evaluated according to the current national standard "Standard for Inspection and Evaluation of Concrete Strength" GBJ 107, and shall meet the design requirements.
5.2.3 Other mechanical properties of sea sand concrete, such as axial compressive strength and elastic modulus, shall be inspected and determined in accordance with GB/T 5008 1, and shall meet the design requirements.
5.3 Long-term Performance and Durability
5.3. 1 coefficient of shrinkage and creep of sea sand concrete shall meet the design requirements.
5.3.2 The durability of sea sand concrete shall include carbonation resistance, sulfate corrosion resistance, water permeability resistance, chloride ion permeability resistance, frost resistance and alkali aggregate reaction resistance.
5.3.3 The durability of sea sand concrete shall meet the requirements in Table 5.3.3 and the design.
Table 5.3.3 Durability Requirements of Sea Sand Concrete
Technical requirements for durability projects
Carbonization depth (mm) ≤25
Sulfate resistance grade (5%Na2SO4 dry-wet cycle) ≥KS60
Impermeability grade ≥P8
Chloride ion penetration resistance (28d electric flux, C) ≤3000.
Chloride ion penetration resistance (chloride ion migration coefficient of 84d RCM, 10- 12m2/s) ≤4.0.
Frost resistance grade ≥F 100
Alkali aggregate reaction (52-week expansion rate, %) ≤0.04
5.3.4 The test method of long-term performance and durability of sea sand concrete shall comply with the provisions of GB/T 50082, Test Method Standard for Long-term Performance and Durability of Ordinary Concrete.
6 mixed design
6. 1 Basic requirements
6. 1. 1 The mix proportion design of sea sand concrete should conform to the current industry standard "Code for Design of Mix Proportion of Ordinary Concrete" JGJ 55, and meet the performance, mechanical properties, long-term performance and durability of the mixture required by design and construction, with the principle of improving concrete compactness and controlling chloride ion content.
6. 1.2 The maximum water-binder ratio of sea sand concrete shall comply with the current national standard "Code for Durability Design of Concrete Structures" GB/T 50476.
6. 1.3 The minimum dosage of sea sand concrete cementing material shall comply with the provisions in Table 6. 1.3. The maximum dosage of sea sand concrete cementing material should not exceed 550 kg/m3; The maximum dosage of mass concrete cementing material should not exceed 450kg/m3.
Table 6. 1.3 Minimum dosage of sea sand concrete cementing material
Maximum water-binder ratio and minimum dosage of cementing material (kg/m3)
Plain concrete reinforced concrete
0.60 250 280
0.55 280 300
0.50 320
0.45 350
Note: 1 Cementitious material dosage refers to the sum of cement dosage and mineral admixture dosage;
2 The concrete preparation with strength grade of C 15 and below is not restricted by this table.
6. 1.4 The content of mineral admixtures and additives shall be determined through trial mixing of concrete, and shall meet the design requirements and construction requirements of strength and durability of sea sand concrete.
6. 1.5 The chloride ion content in sea sand concrete shall be calculated according to the chloride ion content of each raw material, and the maximum chloride ion content shall comply with the provisions in Table 6. 1.5.
Table 6. 1.5 Maximum chloride ion content in sea sand concrete
Maximum chloride ion content under environmental conditions (%)
Reinforced concrete plain concrete
Dry or moisture-proof environment 0.3-0.3
Wet environment without chloride ion 0. 1
The wet environment contains chloride ion of 0.06.
Corrosion environment 0.06
Note: Chloride ion content refers to the percentage relative to the dosage of cementing material.
6. 1.6 When the water level changes in deicing salt environment, long-term wet and cold environment and cold areas in winter, air entraining agent should be added to the sea sand concrete. The air content of concrete can be 4.5% ~ 6.0%, and should not exceed 7.0%.
6. 1.7 When mixing artificial sand and sea sand to prepare sea sand concrete, the mass ratio of sea sand to artificial sand should be 2/3 ~ 3/2.
6. 1.8 For important engineering structures, the maximum alkali content in concrete should not be greater than 3.0 kg/m3; For the calculation of total alkali content of concrete related to measures to prevent alkali-aggregate reaction, the alkali content of fly ash can be calculated as 1/6 of the measured alkali content of fly ash, and the alkali content of slag powder can be calculated as 1/2 of the measured alkali content of slag powder.
6. 1.9 The construction mixture ratio of sea sand concrete should be followed up in the application process, and the mixture ratio should be adjusted in time.
6.2 Mix proportion design steps
6.2. The mix design of1sea sand concrete shall be carried out according to the following steps:
1 Calculate the mixing strength of concrete;
2. Calculate the concrete mixture ratio;
3. According to the calculated mixture ratio, put forward the trial mixture ratio that meets the requirements of concrete workability after trial mixing;
4. On the basis of trial mix, through trial mix and adjustment, the design mix ratio that meets the requirements of strength and durability is put forward;
5. Adjust the production adaptability of the design mixture ratio and determine the construction mixture ratio.
6.3 Determination of Preparation Strength
6.3. The preparation strength of1sea sand concrete shall be calculated according to the following provisions:
1 When the design strength grade is less than or equal to C60, the preparation strength shall be calculated according to the following formula:
(6.3. 1- 1)
Where,-preparation strength of sea sand concrete, MPa；;
—— Standard value of cubic compressive strength of concrete, where is the design strength grade value of sea sand concrete, MPa；;
—— Standard deviation of strength of sea sand concrete, MPa.
2 When the design strength grade is greater than C60, the preparation strength shall be calculated according to the following formula:
(6.3. 1-2)
6.3.2 The standard deviation of the strength of sea sand concrete shall be determined according to the following provisions:
1 When the strength data of the same variety of sea sand concrete is nearly 1 to 3 months, the standard deviation of its strength shall be calculated according to the following formula:
(6.3.2)
Where-the strength of the first group of specimens, MPa；;
—— Average strength of specimen, MPa；;
—— Number of test piece groups, which should be greater than or equal to 30.
For sea sand concrete with strength grade less than or equal to C30, when the calculated value is greater than or equal to 3.0N/mm2, the value shall be taken according to the calculated result; When the calculated value is less than 3.0N/mm2, it should be 3.0N/mm2. For sea sand concrete with strength grade greater than C30 and less than or equal to C60, when the calculated value is greater than or equal to 4.0N/mm2, the value shall be taken according to the calculated result; When the calculated value is less than 4.0N/mm2, it should be 4.0N/mm2.
2 When there is no recent strength data of the same variety of sea sand concrete, the standard deviation of its strength can be taken according to Table 6.3.2.
Table 6.3.2 Standard Deviation Value (MPa)
Standard value of concrete strength ≤C20 C25~C45 C50~C60
4.0 5.0 6.0
6.4 Mix proportion calculation
6.4. 1 The calculation of the mixture ratio of sea sand concrete shall conform to the current industry standard "Code for Design of Mix Ratio of Ordinary Concrete" JGJ 55.
6.4.2 The weight method should be used to calculate the mixture ratio of sea sand concrete.
6.4.3 When calculating the mixture ratio of sea sand concrete, the aggregate should be based on dry mass.
6.4.4 The weight of concrete mixture per cubic meter assumed in calculation can be taken within the range of 2300kg~2400kg when the concrete strength grade is not greater than C35; When the concrete strength grade is greater than C35, it can be taken in the range of 2350kg~2450kg; When the concrete strength grade is high, the upper limit should be taken, and when the concrete strength grade is low, the lower limit should be taken.
6.5 Matching, Adjustment and Determination
6.5. The trial mixing, adjustment and determination of1sea sand concrete shall conform to the current industry standard "Code for Design of Mix Proportion of Ordinary Concrete" JGJ 55.
6.5.2 During trial mixing of sea sand concrete, the mixture ratio should be adjusted according to the influence of shells and light substances.
6.5.3 When determining the design mix ratio and construction mix ratio, the apparent density of concrete mixture shall be determined, and the mix ratio correction coefficient shall be calculated according to the following formula:
(6.5.3)
Where-the measured apparent density of concrete mixture, kg/m3;
—— The calculated apparent density of concrete, that is, the sum of the mass of raw materials used in each cubic meter of concrete, kg/m3.
When the absolute value of the difference between the measured value and the calculated value of concrete apparent density exceeds 2% of the calculated value, the dosage of each material in the mixture ratio should be multiplied by the correction coefficient as the determined design and construction mixture ratio.
6.5.4 The mixture ratio of sea sand concrete shall be inspected and evaluated on the basis of meeting the performance requirements of concrete mixture and the design strength grade of concrete, and the qualified mixture ratio can be determined as the design mixture ratio and construction mixture ratio.
7 architecture
7. 1 General provisions
7. 1. 1 The construction of sea sand concrete shall comply with the relevant provisions of the current national standard "Code for Construction of Concrete Structure Engineering" GB XXX and "Standard for Quality Control of Concrete" GB 50 164.
7. 1.2 During the construction period, the quality of sea sand, other raw materials and concrete shall be inspected according to the requirements in Chapter 8 of this specification.
7.2 Preparation of Sea Sand Concrete
7.2. 1 Ready-mixed concrete should be used as the production method of sea sand concrete. When it is necessary to mix concrete on site, centralized mixing method with automatic metering device should be adopted.
7.2.2 Electronic measuring instruments shall be adopted for the measurement of raw materials, and the measuring instruments shall be calibrated before use to ensure normal operation. The allowable deviation of raw material measurement shall conform to the provisions in Table 7.2.2. When using polycarboxylic acid high-performance water reducer, the maximum allowable deviation of measurement shall be 0.5%.
Table 7.2.2 Allowable deviation of measurement of various raw materials
Allowable deviation of raw material type measurement (by mass)
Cementing materials (cement, admixture, etc.). ) 1%
Chemical admixture (superplasticizer or other chemical additives) 1%
Coarse aggregate and fine aggregate plus or minus 2%
Mixed water 1%
7.2.3 The mixing of sea sand concrete should adopt a forced mixer with two horizontal shafts, and the mixing time can be controlled in 60s~90s. When mixing concrete with sea sand and/or powdery admixture with fineness modulus less than 2.3, the upper limit of mixing time should be taken.
7.2.4 Before preparing concrete, the moisture content of coarse and fine aggregate should be determined, and the concrete mixture ratio should be adjusted according to the change of moisture content; Water content of aggregate shall be sampled at least twice per shift, and shall be sampled at any time in rainy days. The aggregate yard shall be equipped with a canopy.
7.2.5 Before each shift starts, it is best to mix the sea sand evenly in the yard with a forklift.
7.3 Transportation, Pouring and Maintenance of Sea Sand Concrete
7.3. 1 The transportation, pouring and curing of sea sand concrete shall comply with the relevant provisions of the current national standards "Code for Construction of Concrete Structure Engineering" GB XXX and "Standard for Quality Control of Concrete" GB 50 164.
8 Quality inspection and acceptance
8. 1 Quality inspection of concrete raw materials
8. 1. 1 When the raw materials of sea sand concrete enter the site, the supplier shall provide the quality certificate to the buyer according to the specified batch. The quality certificate shall include the type inspection report, ex-factory inspection report and certificate of conformity, etc. In addition, the instruction manual of admixture products should be provided.
8. 1.2 Conduct on-site inspection after raw materials enter the site; In the process of engineering, concrete raw materials should also be sampled.
8. 1.3 The incoming inspection and spot check of raw materials of this project shall meet the following requirements:
1 Sea sand shall include particle gradation, fineness modulus, chloride ion content, shell content, silt content and mud block content.
2 Other raw materials shall be implemented according to the relevant standards for the application of various raw materials in concrete.
8. 1.4 raw material inspection rules shall meet the following requirements:
1 sea sand is an inspection lot every 400m3.
2 Every 500 tons of bulk cement is an inspection lot (every 200 tons of bagged cement); Fly ash, phosphorus slag powder or ground slag powder every 200 tons as an inspection lot; Sand and stone aggregate should be taken as an inspection lot every 400m3; Admixtures should be taken as an inspection lot every 50 tons.
3 Different batches or intermittent supply of concrete raw materials, less than one inspection lot, should be inspected once per batch according to the same variety and grade of materials.
8. 1.5 The quality of sea sand and other raw materials shall comply with the provisions in Chapter 4 of this specification.
8.2 Performance test of concrete mixture
8.2. 1 Various measuring instruments and equipment of the preparation system can only be used after being calibrated and qualified before being put into use, and the concrete production unit shall conduct self-inspection once a month. The measurement deviation of raw materials should be checked twice per shift; The concrete mixing time shall be inspected twice per shift, and the inspection results shall comply with the provisions of Article 7.2.2 of this specification.
8.2.2 Sea sand concrete mixture shall be sampled for inspection, and the inspection items shall include slump, diffusivity, slump loss over time, setting time, segregation, bleeding, viscosity and water retention, and chloride ion content. Slump, expansion, segregation, bleeding, viscosity and water retention should be sampled and tested at the mixing site and pouring site respectively.
8.2.3 The inspection frequency of sea sand concrete mixture is: slump, expansion, segregation, bleeding, viscosity and water retention items are inspected at least twice per shift. The slump loss with time, setting time and chloride ion content are tested every 24 hours.
8.2.4 The performance test of sea sand concrete mixture shall comply with the provisions of Section 5. 1 of this specification.
8.2.5 If the performance of sea sand concrete mixture is abnormal, the cause of the problem should be found out in time and the mixture ratio should be adjusted according to the actual situation.
8.3 Performance test of hardened concrete
8.3. 1 The inspection of mechanical properties, long-term performance and durability of sea sand concrete shall comply with the provisions of Sections 5.2 and 5.3 of this specification, and the items specified in the design shall be inspected, and the items not specified in the design may not be inspected.
8.3.2 The performance test of sea sand concrete shall meet the following requirements:
The strength test of 1 shall conform to the current national standard "Standard for Inspection and Evaluation of Concrete Strength" GBJ 107, and other mechanical performance tests shall conform to the engineering requirements and relevant standards;
2 Durability inspection and evaluation shall conform to the current industry standard "Concrete Durability Inspection and Evaluation Standard" JGJXXX;
3 Long-term performance inspection rules can be implemented according to the current industry standard "Concrete Durability Inspection and Evaluation Standard" JGJ XXX.
8.3.3 The mechanical properties of sea sand concrete shall comply with the provisions of Section 5.2 of this specification; Long-term performance and durability shall comply with the provisions of Section 5.3 of this specification.
8.4 Acceptance of concrete works
8.4. 1 The acceptance of sea sand concrete works shall comply with the Code for Acceptance of Construction Quality of Concrete Structures (GB 50204).
8.4.2 When the sea sand concrete project is completed and accepted, it shall also comply with the provisions of this specification on the long-term performance and durability of sea sand concrete. If there are unqualified items, experts should be organized to conduct special review and put forward treatment opinions, which should be put on record as part of the acceptance documents.
Description of words used in this standard
1 In order to facilitate different treatment when implementing the provisions of this standard, the words with different strict requirements are explained as follows:
1) is very strict and must be:
The positive word is "must" and the negative word is "forbidden";
2) Strictly speaking, under normal circumstances, this should be done:
Positive words should be used, and negative words should be "no" or "no";
3) indicates that a little choice is allowed, and this should be done first if conditions permit;
The positive word is "appropriate" and the negative word is "inappropriate";
4) "can" is used to indicate that you have a choice and can do it under certain conditions.
2 The wording that should be implemented according to other relevant standards is "shall comply with the provisions of ..."
Reference standard list
1. Concrete strength inspection and evaluation standard GBJ 107
2. Radionuclide limit in building materials (GB 6566)
3. Test method for uniformity of concrete admixture GB/T 8077
4. Code for Design of Concrete Structures (GB 500 10)
5. Technical Specification for Application of Concrete Admixtures (GB 50 1 19)
6. Standard for Performance Test Methods of Ordinary Concrete Mixture GB/T 50080
7. Standard GB/T 5008 1
8. Standard for long-term performance and durability test methods of ordinary concrete GB/T 50082
9. Concrete quality control standard GB 50 164
10. Code for Quality Acceptance of Concrete Structure Engineering (GB 50204)
1 1. Code for Durability Design of Concrete Structures GB/T 50476
12. Technical specification for application of mineral admixture GB/T XXX
13. Code for Construction of Concrete Structure Engineering GB XXX
14. Ordinary Portland cement GB 175
15. Fly ash for cement and concrete GB/T 1596
16. Concrete admixture GB 8076
17. Building sand GB 14684
18. granulated blast furnace slag powder for cement and concrete GB/T 18046
19. Standard for Quality and Inspection Methods of Sand and Stone for Ordinary Concrete (JGJ 52)
20. Code for Design of Mix Proportion of Ordinary Concrete JGJ 55
2 1. Standard of test method for basic performance of building mortar JGJ/T 70
22. Code for concrete test of waterway engineering JTJ 270
23. The concrete durability inspection evaluation standard JGJ XXX
24. Concrete water standard JGJ 63
25. Polycarboxylic acid series high performance water reducer JG/T 223
26. Technical specification for application of steel corrosion inhibitor JGJ XXX