Tests on limestones, Civil Engineering

Assignment Help:

Tests on Limestones

Practical tests are made on lime stones to decide their suitability is following:

    i.       Physical tests

   ii.        Heat test

   iii.       Chemical test

   iv.       Ball test.

(i) Physical Test: Pure limestone is white color stone. Hydraulic lime stones are brown, bluish grey or it has dark colors. The hydraulic lime gives out earthy smell. They are having clayey taste. Presence of lumps gives indication of quick lime and unburnt lime stones.

(ii) Heat Test: A piece of dry stone which weigh is W1 is heated in an open fire for few hours. If weight of sample stone after cooling is W2, the loss of weight is W2 - W1. The loss of weight shows the amount of carbon dioxide. From this the amount of calcium carbonate in limestone may be worked out.

(iii) Chemical Test: A teaspoon with full of lime is placed in a test tube and dilute hydrochloric acid is poured in it. Content is stirred and test tube is kept in the stand for 24 hours. Vigorous effervescence and less residue show pure limestone. If effervescence is less and its residue is more it shows impure limestone.

If thick gel is formed and after test tube is held upside down it is possible to recognize class of lime as shown below:

  • Class A lime, if gel do not flow.
  • Class B lime, if gel tends to flow down.
  • Class C lime, if there is no gel formation.

(iv) Ball Test: This test is conducted to recognize whether the lime belongs to class C or to class B. By adding adequate water approximate 40 mm size lime balls are building and they are left undisturbed for 6 hours. Then the balls are placed in a basin of water. If within minute's slow expansion and slow disintegration begin it indicates class C lime. If there is little or no expansion, but just cracks appear it belongs to class B lime.


Related Discussions:- Tests on limestones

Process of installation of elastomeric bearing, The process of installation...

The process of installation of elastomeric bearing differs in case of precast vis-a-vis cast-in-situ girders. For precast girders, the bearing may be fixed to the underside of the

Transit sheds and warehouses, Transit Sheds and Warehouses: These are ...

Transit Sheds and Warehouses: These are sheds constructed as steel frames or RCC frames with a steel truss, with galvanised iron or asbestos cement sheets. Transit sheds may b

Explain the term- shrinkage of concrete, LOSS OF PRESTRESS DUE TO SHRINKAG...

LOSS OF PRESTRESS DUE TO SHRINKAGE OF CONCRETE We know that concrete shrinks in volume when it dries up. This volume reduction takes place in the form of reduction of all dime

Aggregates, list the properties of aggregates

list the properties of aggregates

Abrasion test - tests on stones, Abrasion Test:   This test is carri...

Abrasion Test:   This test is carried out on stones used as aggregates for road construction. The test result shows the suitability of stones against   the grinding action u

Influenza virus, humans who - are the most likely to contact swine flu

humans who - are the most likely to contact swine flu

Engineering economics, Ask quA contractor has both a 3-cy and a 5-cy shovel...

Ask quA contractor has both a 3-cy and a 5-cy shovel in the equipment fleet. Select the minimum size shovel that will excavate 450,000 bcy of common earth in a minimum of 120 worki

Pipes, difference between delievery and suction pipe?

difference between delievery and suction pipe?

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