TB/T 1632.2-2014Welding of rails - Part 2: Flash butt welding (English PDF)

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.

3.1 Test of Los Angeles abrasion ratio

3.1.1 Equipment and machinery

3.1.2 Specimen

Sieving and specimen preparation steps are as follows.

3.2 Test of standard collect stuff concussion temper

3.2.1 Equipment and machinery

3.2.1.1 Standard collect stuff concussion testing machine. the structure

dimensions are shown as Figure 2.

3.3 Test methods for stones wear resistant rigidity coefficient

3.3.1 Equipment and machinery

3.3.1.1 The structure of the disc wear resistance rigidity testing machine is shown in Figure 3.Its rotation speed is 31r/min~33r/min.

3.3.1.2 Stone processing equipment such as diamond machine, stone saw and

stone grinder.

3.3.1.3 Blast drying oven. the maximum control temperature of the equipment

is not less than 200��C, with a temperature adjustment device.

3.3.1.4 Balance. weighing is not less than 2000g, the division value / resolution is 0.01g.

3.3.1.5 Vernier caliper. the accuracy is 0.02mm.

3.3.1.6 Soft brush.

3.3.1.7 Small steel ball or plasticine.

3.3.1.8 No.100 emery.

Figure 3 -- Disc wear resistance rigidity testing machine

3.3.2 Specimen

3.3.3 Procedures

3.4 Test methods for standard collect stuff crunch rate

3.4.1 Equipment and machinery

3.5 Test methods for ballast collect stuff crunch rate

3.5.1 Equipment and machinery

3.6 Test methods for filter coefficient

3.6.1 Equipment and machinery

3.7 Test methods for rock powder test model compressive strength

3.7.1 Equipment and machinery

3.7.1.1 Milling machine of which the output particle size is 120 mesh ~ 200 mesh (0.124mm ~ 0.074mm) and standard vibrating sieving machine.

3.7.2 Specimen

3.7.2.1 Clean the gravel specimen of which the particle size is less than 20mm, the mass is about 2kg. Dry at 105��C~110��C for at least 4h.

3.7.2.6 Pour the rock powder into the stirring pot. Turn on power. Slowly add the diluted hydrochloric acid solution. Stir 3min.

3.7.2.7 Clean and assemble the triple test model. Apply engine oil on the

surface and edges. Mix the specimen and respectively fill the triple test model.

3.7.2.8 Place the triple test model on the base frame of the standard vibrating sieving machine. Press with hands. Vibrate 30s. Regulate the triple test model.

Then vibrate another 30s. Add a small amount of specimen. Vibrate 3s to make the specimen top 5mm~10mm higher than the test model facet.

3.8 Test methods for rock powder fluid limit

3.8.1 Equipment and machinery

3.8.2 Specimen

From the rock powder after the Los Angeles abrasion ratio test, sieve 150g of rock powder of which the particle size is less than 0.5mm. Put into the blender.

Add pure water to make uniform thick paste. Cover to seal and place for not less than 24h.

3.8.3 Procedures

3.8.4 Calculation

3.8.4.1 Calculate the rock powder fluid limit according to formula (14).

3.9 Test methods for rock powder mold limit

3.9.1 Equipment and machinery

3.9.2 Specimen

From the rock powder after the Los Angeles abrasion ratio test, sieve 100g of rock powder of which the particle size is less than 0.5mm, Place into the blender.

Add pure water to mix and make uniform thick paste. Cover to seal. Place a day and night for use. It can also take 30g from the liquid limit test specimen for use.

3.9.3 Procedures

3.10 Test methods for combination of rock powder liquid, mold limits

3.10.1 Equipment and machinery

3.10.2 Specimen

3.10.2.1 From the rock powder after the Los Angeles abrasion ratio test, sieve

about 200g of rock powder of which the particle size is less than 0.5mm. Divide into 3 portions. Place in the blender.

3.10.2.2 Respectively according to the sinking depths of 3mm~5mm,

3.11 Test methods for vitriol natrium liquor marinate loss lead

3.11.1 Equipment and machinery

3.11.2 Specimen

3.11.3 Procedures

3.12.3 Procedures

3.12.3.1 Weigh rock powder Gds = 10g. Pour into the 100mL pycnometer. Inject

pure water to nearly half. And slightly shake to make it dissolved in water.

3.12.4 Calculation

3.13 Test methods for stones specific gravity

3.13.1 Equipment and machinery

3.13.3 Procedures

3.13.4 Calculation

3.13.4.1 Calculate the stones specific gravity according to formula (20).

3.14 Test methods for particle size grading

3.14.1 Equipment and machinery

3.14.1.1 Square hole inspection sieve

Super-class ballast. the hole side lengths are respectively 22.4mm, 31.5mm,

40mm, 50mm and 63mm;

3.14.1.3 Container, shovel.

3.14.2 Specimen

Take four sub-specimens at intervals on the finished product discharge port or conveyor belt of the ballast field. The mass of each sub-specimen is about

100kg. Fully mix and spread on a flat concrete floor. Use the method of quartering to take two specimens and mix for spare use. The mass is about

200kg.

3.14.3 Procedures

3.14.4 Calculation

3.14.4.4 When the drawn particle size grading curve falls into the standard

particle size grading range, it means that this ballast specimen is conforming, otherwise it shall be nonconforming.

3.14.4.5 Fill the record of ballast particle size grading test in Table 20 ~ Table

22.

3.16 Test methods for contents of airslake grain and other incidental stones

3.16.1 Equipment and machinery

3.16.1.1 Platform scale. the weighing is not less than 100kg, the division value is 50g.

3.16.1.2 Container, shovel.

3.16.2 Specimen

3.16.3 Procedures

3.16.3.1 Rinse the specimen clean. Dry and weigh its mass Gf1.The mass unit

is kilogram (kg), to the nearest of 0.05kg.

3.16.3.2 Choose a clean concrete floor. Spread the specimens. Compare with

the specimen submitted for inspection (testing report). Pick the airslake grain and other incidental stones in specimens one by one. Weigh the mass Gf2.The mass unit is kilogram (kg), to the nearest of 0.05kg.

3.16.4 Calculation

Calculate the contents of airslake grain and other incidental stones in ballast according to formula (58).

3.17 Test methods for dust content of the grain below 0.1mm

3.17.1 Equipment and machinery

3.17.1.1 Platform scale. the weighing is not less than 100kg, the division value is 50g. Balance. the weighing is not less than 6kg, the division value / resolution is 2g.

3.17.1.2 Square hole sieve. the hole side lengths are respectively 0.1mm,

2.5mm, 5mm and 10mm, for each.

3.17.1.3 Drying. use blast drying oven indoor, the maximum control temperature

of the equipment is not less than 200��C, with temperature adjustment device; it can use fast drying method outdoor, such as high-purity alcohol.

3.17.1.4 Container, wooden or iron stick, shovel.

3.17.2 Specimen

3.17.2.1 Sampling shall be conducted in the quarry crushing and sieving line or stockyard.

When sampling at the discharge port of the ballast yard or the finished product conveyor belt, take four sub-specimens at intervals. Each sub-specimen is about 25kg. When sampling in quarry stockpiles, remove the surface ballast first. Use the shovel to get the ballast inside. Sampling shall not lose powder.

According to the east, west, south and north directions of the pile, respectively take 25kg.

3.17.2.2 The specimen container shall be leak-proof and wear-resistant. The sample shall not be inverted repeatedly to avoid losing rock powders.

3.17.3 Procedures

3.17.3.1 Dry the specimen indoor at 105��C~110��C for not less than 4h. Cool to room temperature. Weigh its mass Gm1.Use high-purity alcohol to conduct fast drying on site. After cooling, weigh its mass Gm2.The mass unit is kg, to the nearest of 0.05kg.

3.18 Test methods for particle surface cleanness

3.18.1 Equipment and machinery

3.18.1.1 A 10L stainless-steel (or Plexiglas) container with spout, hard bristle

brush.

3.18.2 Specimen

3.18.2.1 When sampling in the yard (storage bin) of the quarry or track laying base, the batch of ballast to be inspected shall not be less than 1000m3.

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