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Q. Write short notes on Abrasion Test?
The abrasion test for ballast shall be carried out using Los-Angeles machine.The abrasive charge shall consist of 12 nos. cast iron or steel spheres approx. 48mm dia and each weighing between 390 and 445 gm ensuring total weight of charge as 5,000 ± 25 gm.
The test sample of 10000gm shall consist of clean ballast conforming to the following grading :- Passing 50mm and retained on 40 mm square mesh sieve 5,000 gm and Passing 40 mm and retained on 25mm square mesh sieve 5,000 gm tolerance of ± 2% permitted. The sample shall be dried in oven at 100 - 110 °C to a constant weight and weighed (Weight 'A')
The test sample and the abrasive charge shall be placed in the Los-Angeles abrasion testing machine and the machine rotated at a speed of 20 - 33 revolutions/minute for 1000 revolutions. At the completion of test, the material shall be discharged and sieved through 1.70mm IS sieve.
The material coarser than 1.70 mm IS sieve shall be washed, dried in oven at 100-110°C to a constant weight and weighed (weight B).
The proportion of loss between Weight "A" and Weight "B" of the test sample shall be expressed as a percentage of the original weight of the test sample. This value shall be reported as: Aggregate Abrasion Value =((A-B)/A)X100.
State the short-term deflections If short-term deflections are considered, the instantaneous deflection due to design loads may be calculated using elastic analysis based on t
With a clear sketch indicate the system of protection of line for works of short duration where ‘ Stop dead restriction' need to be observed on a single line section on a BG track.
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incoming water contains 15 mg/L as a substance
Q. Mosaic and P V C Tiles? The water sink at water points may be provided with mosaic lining at other than important station. Mosaic tiles also may be provided in flooring of
DEFINITION TYPE STEP OF CONSTRUCTION STEP OF SAFETY
LA values of different sizes of materials can be proportionately determined?
what is the eccentricity of ellipse
Binder: Normally 60/70 penetration grade, and provides cohesion to the mixture and increases its stability. The mix design is done by the Marshall test, in which a specimen
Attached information shows construction details of a water tank. The slab was poured in one pour and the walls (incl. Baffles) were poured in two even sections. Forms were stripped
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