Types of limes and their properties, Civil Engineering

Types of Limes and their Properties

The limes are classified in three categories as fat lime, hydraulic lime and poor lime:

(1) Fat lime: It is composed of 95 percentage of calcium oxide. As water is added, it slakes vigorously and its volume increases 2 to 21/2 to times. It is in white color. Its properties are following :

1.    It has high degree of plasticity

2.    hardens slowly

3.    It is white in color

4.    It sets slowly in the presence of air

5.    It slakes vigorously.

(2) Hydraulic lime: It contains ferrous oxide and clay. Depending upon the percentage of clay exit, the hydraulic lime is divided into the following three categories:

   i.        Moderately hydraulic lime (11 to 20% clay content)

   ii.        Feebly hydraulic lime (5 to 10% clay content)

   iii.        Eminently hydraulic lime (21 to 30% clay content)

The properties of hydraulic lime are following:

Its color is not perfectly white

It is sets under water

Its binding property improves if fine powder is mixed with sand and kept in the form of heap for a week, before utilizing.

It forms a thin paste with water and do not dissolve in water.

(3) Poor lime: It contains more than 30% clay. Its color is muddy. It has poor binding property. The mortar composed with such type of lime is used for inferior works.

IS 712-1973 classifies lime as class A, B, C, D and E.

Class A Lime: It is predominantly hydraulic lime. It is usually supplied as hydrated lime and It is generally used for structural works.

Class B Lime: It contains hydraulic lime and fat lime both. It is supplied as hydrated lime or as quick lime. It is utilized for making mortar for masonry works.

Class C Lime: It is predominantly fat lime, supplied both as quick lime and fat lime. It is utilized for finishing coat in plastering and for white washing.

Class D Lime: This lime contains large quantity of magnesium oxide and is similar to fat lime. It is also commonly used for white washing and for finishing coat in plastering.

Class E Lime: It is not a pure lime stone. It is known as kankar. It is available in block and modular form. It is supplied as hydrated lime. It is usually used for masonry mortar.

Posted Date: 10/16/2012 2:38:53 AM | Location : United States

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