Impact test - tests on stones, Civil Engineering

Assignment Help:

Impact Test:

Resistance of stones to impact is found by conducting tests in impacting testing machine .It contain of a frame with guides in which a metal hammer weighing 13.5 to15 kg may freely fall from a height of 380 mm.

913_impact testing machine.png

                  Aggregate impact testing machine

Aggregates of size 10 mm to 12.5 mm range are filled in cylinder in three equal layers; each layer being tamped 25 times. Similar is then transferred to the cup and again tamped 25 times. The hammer is then permitted to fall freely on the specimen 15 times. The specimen is then sieved throughout 2.36 mm sieve. Then,

674_impact testing machine1.png

Where           

 W2 = weight of fines

W1 = original weight.

The recommended impact values for several works are:

  • for wearing course >/30%
  • for bituminous mechadam >/35%
  • for water bound mechadam >/40%

Related Discussions:- Impact test - tests on stones

Softening test point, the importance of softening point of a bitumen materi...

the importance of softening point of a bitumen material in the design of a pavement

Vertical curves - geometric design of roads, Vertical Curves: When tw...

Vertical Curves: When two vertical gradients meet, it is necessary to provide a vertical curve. Two types of vertical curves are used: (a) Summit curve, where the point of

What are the conditions essential for darcy law, What are the conditions es...

What are the conditions essential for Darcy's law to be applicable for flow of water by soil ? Why is the permeability of a clay soil with flocculated structure greater than tha

Show the functions of wet wells, Q. Show the Functions of wet wells? We...

Q. Show the Functions of wet wells? Wetwells are designed to store provisionallysewage/water before it is pumped out. They are generally provided for sewage and stormwater pump

Soil Mechanics, Good evening. I have two homework projects from the Soil Me...

Good evening. I have two homework projects from the Soil Mechanics. I am interesting if anybody can solve them.

What is the safe bearing capacity of a rectangular footing, What is the saf...

What is the safe bearing capacity of a rectangular footing, 1 m × 2 m, placed at a depth of 2 m in an saturated clay having unit weight of 20 kN/m 3 and unconfined compression str

Show elastomeric bearings, 1. Elastomeric bearings must not be placed one b...

1. Elastomeric bearings must not be placed one behind the other along the longitudinal axis of the girder on a single line of support under any circumstances. 2. Bearings of dif

Show ph value of water, Q. PH Value of Water? It is a symbol for hydrog...

Q. PH Value of Water? It is a symbol for hydrogen ion concentration and indicates acidity or alkalinity. When P H Value more than 7 water is alkaline and less than 7 water is a

What is absolute pressure, Absolute pressure is simply the addition of the ...

Absolute pressure is simply the addition of the observed gage pressure plus the value of the local atmospheric pressure.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd