JGJ 53-1992 Quality standard and test method for crushed stone or pebbles for ordinary concrete JGJ53-92 JGJ53-1992 standard download decompression password: www.bzxz.net

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Industry Standard of the People's Republic of China
Crushed Stone or Pebbles for Ordinary Concrete
Quality Standard and Test Method
Technical Requirements and Test Method of Gravel and Crushed Stone for Ordinary Concrete
JCJ53-92
1994Beijing
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Crushed Stone or Pebbles for Ordinary Concrete
Quality Standard and Test Method
JCJ53-92
Editor: China Academy of Building ResearchApproval Department: Ministry of Construction of the People's Republic of ChinaEffective Date: September 1, 1993
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Notice on the Release of the Industry Standard "Quality Standard and Test Method for Crushed Stone or Pebbles for Ordinary Concrete" Jianbiao [1992] No. 931
According to the requirements of the Ministry of Construction (89) Jianbiao Jizi No. 8, the "Quality Standard and Test Method for Crushed Stone or Pebbles for Ordinary Concrete" edited by the China Academy of Building Research has been reviewed and approved as an industry standard, numbered JGJ53-92, and will be implemented on September 1, 1993. The original ministry standard "Quality Standard and Test Method for Crushed Stone and Pebbles for Ordinary Concrete" (JGJ53-79) is abolished at the same time.
This standard is under the unified management of the China Academy of Building Research, the Ministry of Construction's construction engineering standards and technology management unit, and the specific interpretation and other work are the responsibility of the editor-in-chief. It is organized and published by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
December 30, 1992
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
2 Terms and Symbols
2.1 Terms·
2.2 Symbols
3 Quality Requirements·
4 Acceptance, Transportation and Stacking·
5 Sampling and Reduction
5.1 Sampling
5.2 Sample Reduction
6 Inspection Methods
Sieve Analysis of Crushed Stone or Pebbles Test
Test for apparent density of crushed stone or pebbles (standard method)Test for apparent density of crushed stone or pebbles (simplified method)Test for moisture content of crushed stone or pebbles
Test for water absorption of crushed stone or pebbles
Test for bulk density and compact density of crushed stone or pebbles..+
Test for mud content of crushed stone or pebbles
Test for mud content of crushed stone or pebbles
Test for total content of needle-shaped and flaky particles in crushed stone or pebblesTest for organic matter content in pebbles
Test for strength of crushed stone or pebbles
Compression resistance of rocks Strength test
Crushing index value test of crushed stone or pebbles
Sulfide and sulfate content test in crushed stone or pebbles6.15
Alkali activity test of crushed stone or pebbles (lithographic method):6.16Alkali activity test of crushed stone or pebbles (chemical method)6.17Alkali activity test of crushed stone or pebbles (mortar length method)6.18Alkali activity test of carbonate aggregate (rock column method)Engineering Construction Standard Full-text Information System
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（46)
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Crushed stone or pebble test report form
Appendix A
Appendix B
Explanation of terms used in this standard
Additional explanation
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Engineering Construction Standard Full Text Information System
Standard.
In order to reasonably use crushed stone or pebble and ensure the quality of ordinary concrete, this standard is formulated to apply to the quality inspection of crushed stone or pebble with a maximum particle size of not more than 80mm used in the production of ordinary concrete in general industrial and civil buildings and structures. 3. The quality inspection of crushed stone or pebbles shall comply with the provisions of the relevant current national standards in addition to this standard.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Terms and Symbols
2.1.1 Crushed stone: rock particles with a particle size greater than 5 mm obtained by crushing and screening natural rocks or pebbles.
2.1.2 Pebbles: rock particles with a particle size greater than 5 mm formed by natural conditions.
2.1.3 Needle-shaped and flake-shaped particles: any rock particle with a length greater than 2.4 times the average particle size of the particle to which it belongs is a needle-shaped particle; any rock particle with a thickness less than 0.4 times the average particle size is a flake-shaped particle. The average particle size refers to the average value of the upper and lower limit particle sizes of the particle size. 2.1.4 Mud content: the content of particles with a particle size less than 0.080 mm. 2.1.5 Mud content - the content of particles in aggregate with a diameter greater than 5 mm that become less than 2.5 mm after washing and hand squeezing.
2.1.6 Crushing index - the ability of crushed stone or pebbles to resist crushing. 2.1.7 Solidity - the ability of crushed stone or pebbles to resist fragmentation under the influence of climate, environmental changes or other physical factors.
2.1.8 Alkali-reactive aggregate - aggregate that can react chemically with alkali in cement or concrete.
Mass.
Apparent density - the bulk density of aggregate particles per unit volume (including internal closed voids) - the mass of aggregate per unit volume in the natural stacking state. Compact density - the mass of aggregate per unit volume after compaction according to the specified method. 2.2
1p - apparent density.
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Engineering Construction Standard Full-text Information System
Moisture content, water absorption rate.
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P1,P——Bulk density, compact density. 2.2.3
e,0e1—Mud content and mud block content.
—Needle and flake particle content in gravel or pebble. 2.2.6
3. ——Crushing index value of gravel or pebble. 2.2.7e——Expansion rate of specimen at t days age. est——Length change rate of specimen after t days of immersion. 2.2.8
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Grading
Continuous particle size
80~100
95~100
90~100
95~100
90~100
95~10090~100
95~100
95~100
85~100
95~100
95~100
Note: The upper limit of the nominal particle size is the maximum particle size of that particle size. Engineering Construction Standard Full-text Information System
Grain gradation range of crushed stone or pebbles
Cumulative sieve residue by weight (%)
Sieve hole size (round hole sieve) (mm)
85~100
95~100
80~100
95~100
75~100
70~100
Engineering Construction Standard Full-text Information System
Quality requirements
Grain gradation of crushed stone or pebbles shall meet the requirements of Table 3.0.1. (See Table on Page 4)
Single particle size should be used to combine into a continuous particle size with the required gradation, and can also be mixed with continuous particle sizes to improve its gradation or to form a continuous particle size with a larger particle size. It is not suitable to use a single particle size to prepare concrete. If it must be used alone, a technical and economic analysis should be conducted, and tests should be conducted to prove that segregation will not occur or affect the quality of concrete. If the particle gradation does not meet the requirements of Table 3.0.1, measures should be taken and tested to ensure the quality of the project before it is allowed to be used. 3.0.2
2 The content of needle-shaped and flake-shaped particles in crushed stone or pebbles should meet the requirements of Table 3.0.2. Needle and flake particle content
Concrete strength grade
Needle and flake particle content,
by weight (%)
Greater than or equal to C30
Less than c30
For concrete equal to or less than C10, the needle and flake particle content can be relaxed to 40%.
The mud content in crushed stone or pebbles shall comply with the provisions of Table 3.0.3. Mud content in crushed stone or pebbles
Concrete strength grade
Mud content by weight (%)
Greater than or equal to C30
Less than c30
For concrete with anti-freeze, anti-seepage or other special requirements, the mud content of crushed stone or pebbles used should not be greater than 1.0%. If the mud content is basically non-clay stone powder, the mud content can be increased from 1.0% and 2.0% in Table 3.0.3 to 1.5% and 3.0% respectively. For crushed stone or pebbles for concrete equal to or less than C10 grade, the mud content can be relaxed to 2.5%. The mud content in crushed stone or pebbles shall comply with the requirements of Table 3.0.4. Mud content in crushed stone or pebbles
Concrete strength grade
Mud content by weight (%)
Greater than or equal to C30
Less than C30
For concrete with antifreeze, anti-seepage and other special requirements, the mud content of crushed stone or pebbles used should not exceed 0.5%. For crushed stone or pebbles used in concrete equal to or less than C10 grade, the mud content can be relaxed to 1.0%. 3.0.5 The strength of crushed stone can be expressed by the compressive strength and crushing index value of rock. The rock strength should first be provided by the production unit. The crushing index value can be used for quality control in the project. The crushing index value of crushed stone should comply with the provisions of Table 3.0.5-1. Rock compressive strength test should be carried out when the concrete strength grade is C60 and above. In other cases, if there is doubt or it is considered necessary, the rock compressive strength test can also be carried out. The ratio of rock compressive strength to concrete strength grade should not be less than 1.5, and the strength of igneous rock should not be less than 80MPa, metamorphic rock should not be less than 60MPa, and sedimentary rock should not be less than 30MPa. Crushing index value of crushed stone
Rock type
Sedimentary rock
Metamorphic rock or plutonic
Igneous rock
Igneous rock
Concrete strength grade
C55~C40
≤C35
C55~C40
≤C35
C55~C40
≤C35
Table 3.0.5-1
Crushing index value of crushed stone (%)
Water-injected rocks include limestone, sandstone, etc. Metamorphic rocks include gneiss, quartzite, etc. Deep-seated igneous rocks include granite, syenite, diorite and peridotite, etc. Extrusive igneous rocks include basalt and diabase, etc.
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
The strength of pebbles is expressed by the crushing index value. Its crushing index value should be adopted according to the provisions of Table 3.0.5~2.
Crushing index value of pebbles
Concrete strength grade
Crushing index value (%)
C55~C40
Table 3.0.5-2
≤C35
The firmness of crushed stone and pebbles is tested by the sodium sulfate solution method. After 5 cycles, the weight loss of the sample should meet the requirements of Table 3.0.6. Robustness index of crushed stone or pebbles
Environmental conditions of concretewwW.bzxz.Net
Concrete used outdoors in severe cold and cold areas and often in a humid or dry-wet alternating state
Concrete used under other conditions
Weight loss after cycle (%)
Crushed stone or pebbles used in underground structures with corrosive media or often in water level change areas or with fatigue resistance, wear resistance, impact resistance and other requirements should not exceed 8%.
3.0.7 The content of sulfide and sulfate in crushed stone or pebbles, as well as the content of harmful substances such as organic impurities in pebbles should comply with the provisions of Table 3.0.7. Content of harmful substances in crushed stone or pebbles
Sulfide and sulfate content
(converted to SO3, by weight)
Organic matter content in pebbles
(tested by colorimetry)
Quality requirements
The color should not be darker than the standard color.
If it is darker than the standard color, it should be made into
concrete for strength comparison test,
The compressive strength ratio should not be less than 0.95.
If crushed stone or pebbles with granular sulfate or sulfide impurities are found, the project is required to set up standard full-text information system7. Content of harmful substances in crushed stone or pebbles
Sulfide and sulfate content
(converted to SO3, by weight)
Organic matter content in pebbles
(tested by colorimetry)
Quality requirements
The color should not be darker than the standard color.
If it is darker than the standard color, it should be made into
concrete for strength comparison test,
The compressive strength ratio should not be less than 0.95.
If crushed stone or pebbles with granular sulfate or sulfide impurities are found, the project is required to set up standard full text information system7. Content of harmful substances in crushed stone or pebbles
Sulfide and sulfate content
(converted to SO3, by weight)
Organic matter content in pebbles
(tested by colorimetry)
Quality requirements
The color should not be darker than the standard color.
If it is darker than the standard color, it should be made into
concrete for strength comparison test,
The compressive strength ratio should not be less than 0.95.
If crushed stone or pebbles with granular sulfate or sulfide impurities are found, the project is required to set up standard full text information system
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