TB/T 2140.2-2018 English PDF (TBT2140.2-2018)

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TB/T 2140.2-2018: Railway ballast - Part 2: Test methods
TB/T 2140.2-2018
NATIONAL RAILWAY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.040
S 05
Replacing TB/T 2328.1~2328.19-2008
Railway ballast - Part 2: Test methods
ISSUED ON: AUGUST 27, 2018
IMPLEMENTED ON: MARCH 01, 2019
Issued by: National Railway Administration
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Terms and definitions ... 5 
3 Test methods ... 7 
Annex A (normative) Inspection sieve mesh ... 61 
Annex B (normative) Calibration method of pycnometer ... 64 
Annex C (normative) Use requirements for glass filter ... 65 
Railway ballast - Part 2: Test methods
1 Scope
This Standard specifies test methods and calculations for Los Angeles abrasion
ratio, standard collect stuff concussion temper, stones wear resistant rigidity
coefficient, standard collect stuff crunch rate, ballast collect stuff crunch rate,
filter coefficient, rock powder test model compressive strength, rock powder
fluid limit, rock powder mold limit, combination of rock powder fluid limit and
mold limit, vitriol natrium liquor marinate loss lead, stones density, stones
specific gravity, ballast grading, acicular index and laminated index, air-slake
grain and other incidental stones, the dust content of the grain below 0.1mm,
surface cleanness of railway ballast.
This Part is applicable to railway ballast test. The tests of Los Angeles abrasion
ratio, rock powder fluid limit, rock powder mold limit, vitriol natrium liquor
marinate loss lead, ballast grading parameter for grading of gravel on the
bottom of ballast and bed surface may refer to corresponding methods in this
Standard.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1 Los Angeles abrasion ratio
The parameter that uses the abrasion index of Los Angeles wear machine to
indicate ballast (bottom ballast, grading gravel) resistance to impact, abrasion
and edge shearing and other joint action capacity.
2.2 standard collect stuff concussion temper
The parameter that uses the impact index of standard collect stuff concussion
testing machine to indicate the ability of ballast material to resist instantaneous
crash or impact.
2.3 stones wear resistant rigidity coefficient
The parameter that uses the loss of stone after abrasion on the disc abrasion
rigidity testing machine for 1000r to indicate the resistance of the stone to
abrasion.
2.4 standard collect stuff crunch rate
The parameter that uses the mass percentage lost to reflect the crushing
resistance of the stone after using specified test model and load to crush the
gravels of standard particle size.
2.5 ballast collect stuff crunch rate
The parameter of grading change of ballast aggregate specimen according to
the specified test model and load after crushing.
2.6 filter coefficient
The unit flow under unit hydraulic gradient in isotropic media to indicate the
ease of fluid passing through the pore skeleton.
NOTE: Filter coefficient is also called hydraulic conductivity coefficient.
2.7 rock powder test model compressive strength
Use rock powder to prepare the specified test piece. Its uniaxial compressive
strength after drying is called rock powder test model compressive strength.
2.8 rock powder fluid limit
The limit water content of water rock powder from flowing state to molding state
(or from molding state to flowing state).
2.9 rock powder mold limit
The limit water content of water rock powder transited from molding state to
semi-solid state.
2.10 vitriol natrium liquor marinate loss lead
The parameter that uses sodium sulphate crystal expansion in micro-cracking
and open pores of ballast to measure the resistance of ballast to weathering
and frost cracking.
2.11 stones density
The mass per unit volume of stones (excluding the volume of open and closed
pores).
2.12 stones specific gravity
The mass per unit volume of the stones in the dry state including the open and
closed pores.
2.13 ballast grading
The percentage of the mass of ballast particles of various sizes in the total mass.
The standard ballast grading specifies that the mass of ballast particles of
various sizes accounts for a certain percentage of the total mass.
2.14 acicular index
The mass percentage of particles with a length (maximum size) greater than
1.8 times the average particle size.
2.15 laminated index
The mass percentage of particles with a thickness (minimum size) less than 0.6
times the average particle size.
2.16 airslake grain
The particle that some or all of the minerals on the crushed surface of the ballast
are tarnished and the color is changed.
2.17 other incidental stones
The crushed stones that are inconsistent with the rock material of the specimen
submitted for inspection.
2.18 the dust content of the grain below 0.1mm
The percentage of the mass of rock powder in the ballast with a particle size
below 0.1mm.
2.19 surface cleanness of railway ballast
The mass percentage of dust, mud and other debris on the surface of the
particles of the railway ballast product.
3 Test methods
3.1 Test of Los Angeles abrasion ratio
3.1.1 Equipment and machinery
3.1.1.1 The inner diameter of Los Angeles abrasion machine cylinder is 710mm,
the inner length is 510mm, the manufacturing error is ±1mm. The cylinder shall
not be deformed. The structure type and design dimensions are shown in Figure
1. The cylinder rotating speed is 31r/min ~ 33r/min.
3.4.2.2 Sieving
From the naturally wind dried or baked dried specimens, sieve 3 standard
specimens of which the particle size is 10mm~16mm. Each specimen mass Gc1
is 3000g ± 5g. The percentage of acicular, laminated particles of specimen shall
not exceed 5% respectively.
3.4.3 Procedures
3.4.3.1 Filling specimen into test model
The filling of specimen in test model is conducted on a 10cm thick cast iron
(steel plate) countertop. The steps are as follows:
a) Insert a round bard with a diameter of 15mm into the round groove at the
bottom of the test model to make the chassis 10mm above the countertop;
b) Fill the specimen twice in layers. After each layer of filling, shake 30 times
left and right with the round bar as the center;
c) After the second layer shaking, level the specimen surface;
d) Install the indenter.
3.4.3.2 Loading test
At a loading rate of 0.6kN/s ~ 0.8kN/s, load the specimen at a constant speed
to 200kN. Maintain 2min. Unload, Remove the indenter. Pout the specimen out.
3.4.3.3 Sieving
Use a sieve of which the hole side length is 2.5mm to sieve specimens. Weigh
the sieved mass Gc2. Take the integer part.
According to the same procedures, take another two specimens for the test.
3.4.4 Calculation
3.4.4.1 Calculate the standard collect stuff crunch rate of each ballast according
to formula (8).
where,
CA - Standard collect stuff crunch rate of ballast, in percentage (%);
size grade.
3.6 Test methods for filter coefficient
3.6.1 Equipment and machinery
3.6.1.1 South 55 type variable head permeameter.
3.6.1.2 Constant water head glass.
3.6.1.3 Water supply bottle and catheter.
3.6.1.4 Balance: the maximum weighing is not less than 1000g, the division
value / resolution is 0.01g.
3.6.1.5 Blast drying oven: the maximum control temperature of the equipment
is not less than 200°C, with a temperature adjustment device.
3.6.1.6 Cement mortar mixer.
3.6.1.7 Milling ...