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GB/T 14685-2011 PDF in English


GB/T 14685-2011 (GB/T14685-2011, GBT 14685-2011, GBT14685-2011)
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GB/T 14685-2011: PDF in English (GBT 14685-2011)

GB/T 14685-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.15
Q 13
Replacing GB/T 14685-2001
Pebble and Crushed Stone for Construction
ISSUED ON. JUNE 16, 2011
IMPLEMENTED ON. FEBRUARY 01, 2012
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Foreword
This standard was drafted according to the rules specified in GB/T 1.1-2009.
This standard replaces GB/T 14685-2001 "Pebble and Crushed Stone for Building";
the main changes of technical content, compared with GB/T 14685-2001, are listed as
follows.
- Standard name was modified (the cover of Edition 2001; the cover of this edition);
- Application scope was modified (Chapter 1 of Edition 2001; Chapter 1 of this
edition);
- Definition of crushed stone was modified (3.2 of Edition 2001; 3.2 of this edition);
- The original purpose and specifications were deleted (4.2 and 4.4 of Edition 2001);
- General requirements of stones for construction were added (Chapter 5 of this
edition);
- Technical requirements of grain composition, clod content, elongated or flat
particle content and pebble crushing index were modified (5.1, 5.2, 5.3 and 5.6 of
Edition 2001; 6.1, 6.2, 6.3 and 6.6 of this edition);
- Technical requirements of apparent density, stacking density and voidage were
modified (5.7 of Edition 2001; 6.7 and 6.10 of this edition);
- Technical requirements of water absorption were added (6.8 of this edition);
- Technical requirements of water ratio were added (6.10 of this edition);
- Test method of apparent density was modified (6.12 of Edition 2001; 7.12 of this
edition);
- Test method of alkali-carbonate reaction was modified (6.14 of Edition 2001; 7.15
of this edition);
- Requirements of exit-factory inspection items were modified (Article 7.1.1 of
Edition 2001; Article 8.1.1 of this edition);
- Requirements of type inspection were modified (Article 7.1.2 of Edition 2001;
Article 8.1.2 of this edition);
- Criteria were modified (Article 7.3.2 of Edition 2001; Article 8.3.2 of this edition).
This standard was proposed by and shall be under the jurisdiction of China Building
Materials Federation.
Table of Contents
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 5 
4 Classification ... 6 
5 General Requirements ... 7 
6 Technical Requirements ... 7 
7 Test Methods ... 9 
8 Inspection Rules ... 42 
9 Mark, Storage and Transportation ... 43 
Annex A (Normative) Aggregate Alkali Reactivity Inspection ... 44 
Reference ... 46 
Pebble and Crushed Stone for Construction
1 Scope
This standard specifies the definitions, classification and specification, technical
requirements, test methods, inspection rules, symbol, storage and transportation of
pebble and crushed stone for building.
This standard is applicable to the cement concrete for construction engineering (except
hydraulic structure), and the pebbles and crushed stones used for its products.
2 Normative References
The following documents are indispensable for the application of this standard. For
dated normative references, only the dated editions are applicable to this document.
For undated references, the latest editions of the normative documents (including all
the amendments) are applicable to this document.
GB 175 Common Portland Cement
GB/T 2419 Test Method for Fluidity of Cement Mortar
GB/T 6003.1 Test Sieves of Metal Wire Cloth
GB/T 6003.2 Test Sieves of Perforated Metal Plate
GB 6566 Limit of Radionuclides in Building Materials
GB/T 17671 Method of Testing Cements -- Determination of Strength
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Pebble
Rock particles of which the particle size is larger than 4.75mm, formed through natural
weathering, water-flow transport, sorting and stacking.
3.2 Crushed stone
Rock particles of which the particle size is larger than 4.75mm, made of natural rock,
pebble or mining barren rock through mechanical crashing and screening of natural
rock or pebble.
3.3 Elongated or flat particle
Elongated particles are those pebble and crushed stone particles of which the length
is larger than 2.4 times of the average particle diameter of the corresponding particle-
grade; flaky particles are those of which the thickness is less than 0.4 times of the
average particle diameter (average particle diameter refers to the average value of the
upper and lower limit particle size).
3.4 Clay content
Material finer than 75 μm in pebble and crushed stone.
3.5 Clay lumps and friable particles content
Contents of particles in the pebble and crushed stone of which the original particle size
is larger than 4.75mm, and less than 2.36mm after immersion cleaning with water and
squeezing with hands.
3.6 Firmness
The ability of pebble and crushed stone to resist fracture under the action of natural
weathering and other external physicochemical factors
3.7 Alkali-aggregate reaction
Expansion reaction of concrete components such as concrete and admixture, alkali in
the environment, as well as alkali active mineral in the aggregate occurring slowly in
the humid environment and resulting in concrete cracking damage.
4 Classification
4.1 Classification
Stones for construction are divided into.
a) Pebble;
b) Crushed stone.
4.2 Type
They can be divided into Type I, Type II and Type III according to the technical
G1 - Mass of dried samples before test, g;
G2 - Mass of dried samples after test, g
7.4.3.2 Clay content is the arithmetical mean of two test results, to the accuracy of 1%.
7.4.3.3 Rounding-value comparison method is adopted for evaluation.
7.5 Clay lumps and friable particles content
7.5.1 Instrument and equipment
a) Blowing oven. it shall be able to control the temperature within (105 ± 5)°C;
b) Balance. weighing is 10kg; sensibility is 1g;
c) Square-opening sieve. one sieve with 2.36mm and 4.75mm aperture respectively;
d) Vessel. make sure the samples not spill during elutriation;
e) Enamel tray and fur brush, etc.
7.5.2 Test procedures
7.5.2.1 Sample according to the provisions of 7.1; divide the samples to the quantity
slightly larger than 2 times of those specified in Table 11. Samples shall be placed in
the oven; dry under (105±5)°C to constant quantity. Particles less than 4.75mm shall
be screened out after cooling to the room temperature. Samples shall be divided into
two equal portions for usage.
7.5.2.2 A portion of samples shall be weighed according to the quantity specified in
Table 11, to the accuracy of 1g. The samples shall be poured into the elutriation vessel,
and fresh water shall be injected to make the water surface higher than the upper
surface of the sample; soak for 24 hours after mixed evenly. The clods shall be crushed
with hands in the water. Samples shall be placed on the 2.36mm sieve and elutriated
with water until the water in the vessel is clean through visual observation.
7.5.2.3 The residual samples shall be taken out from the sieve carefully; put into the
enamel tray; place into the oven and dry under (105±5)°C to constant quantity. The
mass shall be weighed after cooling to the room temperature, to the accuracy of 1g.
7.5.3 Result calculation and evaluation
7.5.3.1 Clay lumps and friable particles content shall be calculated according to
Formula (2), to the accuracy of 0.1%.
b G
-GGQ  ×100 (2)
Where, Qb - Clay lump, %;
G1 - Mass of screen-residue sample through 4.75 mm sieve, g;
G2 - Mass of dried samples after test, g
7.5.3.2 Clay lumps and friable particles content is the arithmetical mean of two test
results, to the accuracy of 1%.
7.6 Content of elongated or flat particle
7.6.1 Instrument and equipment
a) ...
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.