GB/T 14685-2022 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 14685-2022 | English | 500 |
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Pebble and crushed stone for construction
| Valid |
| GB/T 14685-2011 | English | 140 |
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Pebble and crushed stone for construction
| Obsolete |
| GB/T 14685-2001 | English | RFQ |
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Pebble and crushed stone for building
| Obsolete |
| GB/T 14685-1993 | English | RFQ |
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3 days
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Pebble and crushed stone for building
| Obsolete |
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GB/T 14685-2022: Pebble and crushed stone for construction---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14685-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.15
CCS Q 13
Replacing GB/T 14685-2011
Pebble and crushed stone for construction
Issued on. APRIL 15, 2022
Implemented on. NOVEMBER 01, 2022
Issued by. State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Classifications and categories... 8
5 General requirements... 8
6 Technical requirements... 8
7 Test methods... 11
8 Inspection rules... 48
9 Marking, storage, transportation... 49
1 Scope
This document stipulates the classification and categories, general requirements,
technical requirements, test methods, inspection rules, marking, storage, transportation
of pebbles and crushed stone used for construction.
This document applies to pebbles and crushed stone, which are used in cement concrete
and its products in construction projects (except hydraulic buildings).
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB 175 Common Portland cement
GB/T 2419 Test method for fluidity of cement mortar
GB/T 6003.1 Test sieves - Technical requirements and testing - Part 1.Test sieves
of metal wire cloth
GB/T 6003.2 Test sieves - Technical requirements and testing - Part 2.Test sieves
of perforated metal plate
GB 6566 Limits of radionuclides in building materials
GB 8076-2008 Concrete admixtures
GB/T 14684-2022 Sand for construction
GB/T 17671 Test method of cement mortar strength (ISO method)
SL/T 352-2020 Test code for hydraulic concrete
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Pebble
Under the action of natural conditions, rocks undergo crushing, weathering, sorting,
migration, accumulation (sedimentation), forming rock particles which have a
particle size greater than 4.75 mm.
3.2 Crushed stone
Rock particles, which have a particle size greater than 4.75 mm, as produced from
natural rocks, pebbles or mining waste rocks, through mechanical processing such
as crushing and screening.
3.4 Irregular particle
The particles of pebbles and crushed stone whose smallest one-dimensional size is
less than 0.5 times the average particle diameter of the particle level to which the
particle belongs.
3.5 Clay content in pebble
The content of clay particles in pebbles, which have a particle size less than 75 μm.
3.6 Clay content and fine content in crushed stone
The content of clay and stone powder particles in the crushed stone, which have a
particle size less than 75 μm.
4 Classifications and categories
4.1 Classification
Stones used for construction are divided into two categories. pebbles and crushed stone.
4.2 Category
Stones for construction are classified according to clay content in pebble (clay content
and fine content in crushed stone), clay lumps and friable particles content, elongated
and flaky particle content, irregular particle content, sulfide and sulfate content,
soundness,
5 General requirements
In addition to complying with the provisions of 6.4, harmful substances in crushed stone
produced from mining waste rock shall also comply with the requirements of China's
environmental protection and safety-related standards and specifications.
6 Technical requirements
6.1 Particle gradation
The particle gradation of pebbles and crushed stone shall comply with the requirements in Table 1.
6.2 Clay content in pebble, clay content and fine content in crushed stone, clay
lumps and friable particles content
The clay content in pebble, clay content and fine content in crushed stone, clay lumps
and friable particles content shall comply with the requirements in Table 2.
6.3 Elongated and flaky particle content and irregular particle content
6.3.1 Elongated and flaky particle content
The elongated and flaky particle content of pebbles and crushed stone shall comply
with the requirements in Table 3.
6.3.2 Irregular particle content
The irregular particle content of category I pebbles and crushed stone shall not exceed 10%.
6.4 Hazardous substances
The harmful substance content of pebbles and crushed stone shall comply with the
provisions of Table 4.
6.5 Soundness
When using the sodium sulfate solution method for testing, the mass loss of pebbles
and crushed stone shall comply with the requirements in Table 5.
6.6 Strength
6.7 Apparent density, continuous graded loose packing void ratio
The apparent density of pebbles and crushed stone and the void ratio of continuously
graded loose stacks shall comply with the following requirements.
6.8 Water absorption rate
The water absorption rate of pebbles and crushed stone shall comply with the
requirements in Table 9.
6.9 Radioactivity
The radioactivity of pebbles and crushed stone shall comply with the requirements of GB 6566.
6.10 Alkali-aggregate reaction
When the purchaser makes a request, the measured expansion rate and alkali activity
evaluation results shall be provided.
6.11 Moisture content and bulk density
When the purchaser makes a request, the actual measured value shall be provided.
7 Test methods
7.1 Specimen
7.2 Test environment and test sieve
7.3 Particle gradation
7.3.1 Instruments and equipment
Instruments and equipment shall meet the following requirements.
7.3.2 Test procedures
7.3.3 Result calculation and evaluation
7.4 Clay content in pebble and clay content and fine content in crushed stone
7.5 Clay lumps and friable particles content
7.5.3 Result calculation and evaluation
7.6 Elongated or flaky particle content
7.6.1 Instruments and equipment
Instruments and equipment shall meet the following requirements.
7.6.2 Test procedures
7.6.3 Result calculation and evaluation
The content of elongated or flaky particles shall be calculated according to formula (3),
accurate to 1%.
7.7 Irregular particle content
7.7.1 Instruments and equipment
Instruments and equipment shall meet the following requirements.
7.7.2 Test procedures
7.7.3 Result calculation and evaluation
7.8 Organic matter content
7.8.1 Reagents and materials
Reagents and materials shall comply with the following requirements.
7.8.2 Instruments and equipment
Instruments and equipment shall meet the following requirements.
7.8.3 Test procedures
7.8.4 Result evaluation
7.9 Sulfide and sulfate content (based on SO3 mass)
7.10 Soundness
7.10.1 Reagents and materials
Reagents and materials shall comply with the following requirements.
7.10.2 Instruments and equipment
Instruments and equipment shall comply with the following requirements.
7.10.3 Test procedures
7.10.4 Result calculation and evaluation
7.11 Rock compressive strength
7.12 Crush Indicator
7.12.1 Instruments and equipment
Instruments and equipment shall meet the following requirements.
7.12.2 Test procedures
7.12.3 Result calculation and evaluation
7.13 Apparent density
7.13.1 Liquid specific gravity balance method
7.13.2 Jar method
7.14 Packing density and void ratio
7.14.1 Instruments and equipment
Instruments and equipment shall meet the following requirements.
7.14.2 Test procedures
7.14.3 Result calculation and evaluation
7.14.4 Calibration method of volumetric cylinder
Fill the volumetric cylinder with drinking water, at a temperature of 15 °C ~ 25 °C. Use
a glass plate to push it along the opening of the cylinder, to make it close to the water
surface. Wipe the outer wall of the cylinder dry. Then weigh its mass. The volume of
the volumetric cylinder is calculated according to formula (17), accurate to 1 mL.
7.15 Water absorption
7.15.1 Instruments and equipment
Instruments and equipment shall meet the following requirements.
7.15.2 Test procedures
7.15.3 Result calculation and evaluation
7.16 Radioactivity
It is carried out, according to the provisions of GB 6566.
7.17 Alkali-aggregate reaction
7.18 Moisture content
7.18.1 Instruments and equipment
Instruments and equipment shall meet the following requirements.
7.18.2 Test procedures
7.18.3 Result calculation
8 Inspection rules
8.1 Inspection
8.1.1 Exit-factory inspection
The exit-factory inspection items of pebbles and crushed stone shall be. loose packing
density, particle gradation, clay content in pebble (clay content and fine content in
crushed stone), clay lumps and friable particles content, elongated or flaky particle
content, irregular particle content (category I).
8.1.2 Type inspection
Type inspection shall be carried out under any of the following circumstances.
8.2 Group-batching rules
Group batches according to the same classification, category, nominal particle size,
daily output. If the daily output does not exceed 4000 t, every 2000 t forms a batch; if
it is less than 2000 t, it is also a batch.
8.3 Determination rules
8.3.1 When the test results are all in compliance with the provisions of 6.1 ~ 6.9 of this
document, the batch of products can be judged to be qualified.
8.3.2 When a test result does not meet the requirements of 6.1 ~ 6.9, it shall double the
sample from the same batch of products, to carry out reinspection of this item. After re-
inspection, if the test results meet the requirements, the batch of products can be judged
to be qualified; if they still do not meet the requirements of 6.1 ~ 6.9, they will be judged
to be unqualified. When two or more test results are inconsistent, the batch of products
will be deemed unqualified.
9 Marking, storage, transportation
9.1 When pebbles and crushed stone leave the factory, both the supplier and the buyer
shall inspect and accept the products in the factory. The manufacturer shall provide a
product quality certificate, which includes.
9.2 Pebbles and crushed stone shall be stacked and transported separately, according to
classification, category, nominal particle size, to prevent artificial crushing and product
contamination.
9.3 During transportation, measures shall be taken to prevent spillage to avoid
environmental pollution.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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