GB/T 14684-2022 English PDF (GB/T14684-2022)

GB/T 14684-2022: Sand for construction
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GB/T 14684-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.15
CCS Q 13
Replacing GB/T 14684-2011
Sand 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
Introduction ... 6
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 7
4 Classifications and categories ... 9
5 General requirements ... 10
6 Technical requirements ... 10
7 Test methods ... 13
8 Inspection rules ... 54
9 Marking, storage, transport ... 55
Sand for construction
1 Scope
This document stipulates the classification and categories, general requirements,
technical requirements, test methods, inspection rules, marking, storage, transportation
of sand for construction.
This document applies to cement concrete and its products, as well as sand used in
ordinary mortar, in construction projects.
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 601 Chemical reagent - Preparations of standard volumetric solutions
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 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.
4.1.1 According to the source, it is divided into natural sand, manufactured sand, mixed
sand.
4.1.2 According to the fineness modulus, it is divided into coarse sand, medium sand,
fine sand, extra fine sand. The fineness modulus are as follows:
- Coarse sand: 3.7 ~ 3.1;
- Medium sand: 3.0 ~ 2.3;
- Fine sand: 2.2 ~ 1.6;
- Extra fine sand: 1.5 ~ 0.7.
4.2 Category
Construction sand is divided into category I, category II, category III, based on particle
gradation, clay content (fine content), methylene blue (MB) value, clay lumps and
friable particles content, hazardous substances, soundness, crushing index, flake
particle content technical requirements.
5 General requirements
5.1 In addition to complying with the provisions of 6.4, hazardous substances in
manufactured sand, which are produced from mining waste rock and tailings, shall also
comply with the requirements of the environmental protection and safety-related
standards and specifications in China.
5.2 The technical requirements, test methods, inspection rules, marking, storage and
transportation of mixed sand shall be implemented as for manufactured sand.
6 Technical requirements
6.1 Particle gradation
6.1.1 Except for extra-fine sand, the cumulative screening residue of category I sand
shall comply with the requirements of Zone 2 in Table 1; the sub-calculated screening
residue shall comply with the requirements of Table 2. The cumulative screening
residue of category II and category III sand shall comply with the requirements of Table
1. The actual particle gradation of sand can be exceeded, except for 4.75 mm and 0.60
mm screen; however, the sum of the cumulative screen residue excess values at all
levels shall not be greater than 5%.
in a moist state. Pile it into a round cake, which has a thickness of about 20 mm. Then
divide the round cake into 4 equal parts, along two mutually perpendicular diameters.
Take 2 diagonal sets. Mix them thoroughly. Then pile them into a round cake. Repeat
the above process, until the sample is reduced to the required amount for the test.
7.1.3.3 The samples used in the bulk density and manufactured sand soundness tests
can be tested directly, after being mixed evenly, without being reduced.
7.2 Test environment
The temperature of the laboratory shall be maintained at (20 ± 5) °C.
7.3 Particle gradation
7.3.1 Instruments and equipment
Instruments and equipment shall meet the following requirements:
a) Oven: Temperature controlled at (105 ± 5) °C;
b) Balance: The measuring range is not less than 1000 g; the graduation value is not
more than 1 g;
c) Test sieve: The sieves which have specifications of 0.15 mm, 0.30 mm, 0.60 mm,
1.18 mm, 2.36 mm, 4.75 mm, 9.50 mm; have sieve bottom and sieve cover;
comply with the provisions for square hole test sieves in GB/T 6003.1 and GB/T
6003.2;
d) Sieve shaker.
7.3.2 Test procedures
7.3.2.1 Take samples according to the provisions of 7.1. Screen out particles larger than
9.50 mm. Calculate the screening residue percentage. Reduce the specimen to about
1100 g. Dry it in an oven at (105 ± 5) °C, until it reaches constant weight. After cooling
to room temperature, divide it into 2 equal portions, to prepare for use.
Note: Constant weight means that when the interval between two adjacent weighing is not less
than 3 hours, the difference in mass between the two is not greater than the weighing accuracy
required for the test (the same below).
7.3.2.2 Weigh 500 g of specimen, accurate to 1 g. Pour the specimen onto a set of sieves
(with sieve bottom), which are assembled from top to bottom according to the hole size.
Then sieve it.
7.3.2.3 Place the sieve set on the sieve shaker. Shake the sieve for 10 minutes. Remove
the sieve set. Sieve it by hand one by one, according to the size of the sieve holes, until
the throughput per minute is less than 0.1% of the total specimen volume. The passed
w - Moisture content;
mw0 - Mass of methylene blue before drying, in grams (g):
mw1 - Mass of methylene blue after drying, in grams (g).
b) Preparation of methylene blue solution: Weigh [100 × (1 + w)/10] g ± 0.01 g of
the undried methylene blue, that is, (10.00 ± 0.01) g of dry methylene blue,
accurate to 0.01 g. Pour into a beaker, which contains about 600 mL of distilled
water at a temperature of 35 °C ~ 40 °C. Use glass rod to stir continuously, until
the methylene blue is completely dissolved. Cool it to 20 °C. Pour the solution
into a 1 L volumetric flask. Use distilled water to rinse the beaker, to move all the
methylene blue solution into the volumetric flask. The temperature of the
volumetric flask and the solution shall be maintained at (20 ± 1) °C. Add distilled
water to the 1 L mark of the volumetric flask. Shake the volumetric flask, to
ensure that the methylene blue is completely dissolved. Move the solution from
the volumetric flask into a dark storage bottle. Mark the preparation date and
expiration date. Store it in a dark place. The shelf life of methylene blue solution
shall not exceed 28 days.
7.5.1.3 Filter paper: Rapid quantitative filter paper shall be used.
7.5.2 Instruments and equipment
Instruments and equipment shall meet the following requirements:
a) Oven: Temperature controlled at (105 ± 5) °C;
b) Balance: The measuring range is not less than 1000 g and the graduation value is
not greater than 0.1 g; the measuring range is not less than 100 g and the
graduation value is not greater than 0.01 g;
c) Test sieves which have hole diameter of 75 μm, 1.18 mm, 2.36 mm;
d) Container: The depth is greater than 250 mm. When washing the specimen, keep
the specimen from splashing.
e) Pipette: 5 mL, 2 mL;
f) Fine content meter or impeller stirrer: Adjustable speed, up to (600 ± 60) r/min,
diameter (75 ± 10) mm;
g) Timing device: graduation value 1 s;
h) Glass volumetric flask: 1 L.
7.5.3 Test procedures
7.5.3.1 Determination of the content of manufactured sand and gravel powder
The fine content of manufactured sand powder shall be determined in accordance with
the provisions of 7.4.2.
7.5.3.2 Determination of methylene blue value of manufactured sand
7.5.3.2.1 Take samples according to the provisions of 7.1. Reduce the specimen to about
400 g. Place it in an oven and dry it at (105 ± 5) °C, to a constant weight. After cooling
to room temperature, screen out the particles larger than 2.36 mm, to prepare for use.
7.5.3.2.2 Weigh 200 g of the specimen, accurate to 0.1 g; record it as m0. Pour the
specimen into a beaker containing (500 ± 5) mL distilled water. Use an impeller mixer,
to stir it at (600 ± 60) r/min for 5 minutes, to form a suspension. Then continue to stir
at (400 ± 40) r/min, until the end of the test.
7.5.3.2.3 Add 5 mL of methylene blue solution to the suspension. Stir for at least 1
minute at (400 ± 40) r/min. Then use a glass rod to dip a drop of the suspension. The
suspension droplets shall be such that the diameter of the sediment is within 8 mm ~ 12
mm. Drop it on the filter paper. At the same time, the filter paper shall be placed on an
empty beaker or other support, so that the surface of the filter paper does not come into
contact with any solid or liquid. If there is no color halo around the sediment, add
another 5 mL of methylene blue solution. Continue stirring for 1 min. Then use a glass
rod to dip a drop of the suspension into the filter paper. If there is still no color halo
around the sediment, repeat the above steps, until a stable light blue halo of about 1 mm
appears around the sediment. At this time, stirring shall be continued, without adding
methylene blue solution. A contamination test shall be performed once every 1 minute.
If the color halo disappears within 4 minutes, add another 5 mL of methylene blue
solution; if the color halo disappears within 5 minutes, add another 2 mL of methylene
blue solution. In both cases, stirring and staining tests shall be continued, until the halo
persists for 5 minutes.
7.5.3.2.4 Record the total volume (V) of methylene blue solution, which is added when
the color halo lasts for 5 minutes, accurate to 1 mL.
7.5.3.3 Rapid test of methylene blue
7.5.3.3.1 Prepare specimen according to 7.5.3.2.1.
7.5.3.3.2 Stir it according to 7.5.3.2.2.
7.5.3.3.3 Add 30 mL of methylene blue solution to the beaker at one time. Stir
continuously for 8 minutes at (400 ± 40) r/min. Then use a glass rod to dip a drop of the
suspension, to drop it on the filter paper. Observe the precipitate, to see whether there
is any obvious color halo around.
7.5.4 Result calculation
and cool to room temperature; then measure its density, until the solution
density reaches 2000 kg/m3.
7.8.2 Instruments and equipment
Instruments and equipment shall meet the following requirements:
a) Oven: Temperature controlled at (105 ± 5) °C;
b) Balance: The measuring range is not less than 1000 g; the graduation value is not
more than 0.1 g;
c) Measuring tools: A measuring cup which has a measuring range of 1000 mL and
a graduation value not greater than 5 mL; a measuring cylinder which has a
measuring range of 250 mL and a graduation value not greater than 5 mL; a beaker
which has a measuring range of 150 mL and a graduation value not greater than
1 mL;
d) Hydrometer: Measuring range is 1800 kg/m3 ~ 2200 kg/m3;
e) Test sieve: The sieve which has hole diameter of 4.75 mm and 0.30 mm;
f) Mesh basket: The inner diameter and height are both about 70 mm; the mesh hole
diameter is not larger than 0.30 mm.
7.8.3 Test procedures
7.8.3.1 Take specimens according to the provisions of 7.1. Reduce the specimen to
about 800 g. Dry it in an oven at (105 ± 5) °C to a constant weight. After cooling to
room temperature, screen out the particles larger than 4.75 mm and smaller than 0.30
mm. Divide into 2 parts equally, to prepare for use.
7.8.3.2 Weigh 200 g of the specimen, accurate to 0.1 g. Record it as md0. Pour the
specimen into a measuring cup, which contains heavy liquid. Use a glass rod to stir
thoroughly, to fully separate the lightweight materials and sand in the specimen. After
standing for 5 minutes, pour the floating lightweight materials together with part of the
heavy liquid into the mesh basket. The lightweight materials remain on the mesh basket,
while the heavy liquid flows into another container through the mesh basket. Sand
particles shall not be brought out when pouring the heavy liquid. Generally, pouring
will stop when the distance between the surface of the heavy liquid and the surface of
the sand is 20 mm ~ 30 mm; pour the flowing out heavy liquid back into the measuring
cup, which contains the specimen. Repeat the above process, until no lightweight
material floats.
7.8.3.3 Use clean water to wash the substance remaining in the mesh basket. Then move
it into a beaker which reaches constant weight (mass md1). Place it in an oven and dry
it to constant weight at (105 ± 5) °C. After cooling to room temperature, weigh the total
value is not greater than 5 mL, 1000 mL and the graduation value is not greater
than 5 mL;
c) Test sieve: A sieve which has a hole diameter of 4.75 mm.
7.9.3 Test procedures
7.9.3.1 Take samples, according to the provisions of 7.1. Reduce the specimen to about
500 g. After air-drying, screen out particles larger than 4.75 mm, to prepare for use.
7.9.3.2 Put the air-dried specimen into the 250 mL volumetric cylinder, to the 130 mL
mark. Then inject the sodium hydroxide solution to the 200 mL mark. Add the stopper.
Shake vigorously. Let it stand for 24 hours.
7.9.3.3 Compare the color of the upper solution of the specimen and the standard
solution. The measuring cylinder which contains the standard solution shall be
consistent with that containing the specimen.
7.9.4 Results evaluation
7.9.4.1 When the color of the solution in the upper part of the specimen is lighter than
the color of the standard solution, the organic matter content of the specimen is deemed
to be qualifi...