Tests on limestones, Civil Engineering

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.

Posted Date: 10/16/2012 2:40:22 AM | Location : United States







Related Discussions:- Tests on limestones, Assignment Help, Ask Question on Tests on limestones, Get Answer, Expert's Help, Tests on limestones Discussions

Write discussion on Tests on limestones
Your posts are moderated
Related Questions

Q. Avoidance of designing acute angle of concrete pavement The stress persuaded in acute angle corners of concrete pavement is far much higher than right-angle corners of the

Geometric Design Of Roads: Geometric design of roads deals with elements such as cross-section, horizontal and vertical alignment, sight distances, lateral and vertical cleara

How can we reduced frictional losses Frictional losses can be reduced by several methods, such as : (a) Over-tensioning the tendons by an amount equal to the maximum frictio

Functions and Desirable Characteristics of Pavements Function of Pavement A pavement is that part of a road on which vehicles travel. The pavement has the following f

Find the normal stress: Figure 1 shows the projection of a rectangular prism ABCD, formed by adhesive bonding of two triangular prisms ABC and ACD. The state of stress in the

State the term- friction in tendon Considerable frictional loss takes place due to friction between the tendon and the material surrounding it, namely the concrete or the sheat

What is the difference between routing maintenance and major maintenance in school facilities? Ans) The routine maintenance is the minor and consistent repairs that are engaged