Types of lime and its applications

Several types of lime are found in construction which range from Quick Lime, Slaked Lime, Fat Lime and Hydraulic Lime. The natural limestone is calcinated at 900 degree celsius temperature to produce lime. Every type lime is different in nature and is utilized in environmental, construction, chemical and metallurgical industries.

The following types of lime is frequently utilized in construction :

1. Quick Lime
2. Slaked Lime
3. Fat Lime
4. Hydraulic Lime

1. Quick Lime: Quick lime is also known as caustic lime ( Calcium Oxide). It is formed by burning clean limestone ( Calcination process). It is the most inexpensive form of lime that which is extremely amorphous and caustic. Quick lime can be easily combined with moisture.

Quick lime is considered as one of the major elements in producing cement. It is also a vital element that can be applied for the treatment of drinking water.

2. Slaked Lime: Slaked lime is formed by the method of slaking under which quick lime is mixed with water. Slaked lime is also called as hydrate of lime. It is found as pure lime in the type of a white powder.

When Slaked lime is uncovered to the atmosphere, it soaks up carbonic acid in the existence of water content. It is also known as calcium hydroxide or calcium hydrate or lime hydrate.

If Slaked lime is produced by adding quick lime and water, a slurry material is made. It is very effective for mortar applications. It is also applied in plastering works and in cement as a binder.

3. Fat Lime: In fat lime, calcium oxide is used in huge amount. It is also known as white lime or rich lime or high calcium lime or pure lime. It slakes intensely while adding water to it. Due to slaking, its volume is raised by two to two and a half times more than that of quick lime.

Fat lime is suitable for pointing in masonry works, foundation, with surkhi to solidify the masonry walls etc.

4. Hydraulic Lime: Hydraulic lime is also known as water lime. It comprises of 30 percent of silica and 5 percent of alumina together with iron oxide. After adding water, this lime sets quickly.

Applications of Lime in Construction.

Major uses of lime are enlisted below:

1. Lime is utilized in the manufacturing of steel to take off the impurities.
2. Make soil stable for construction of roads, airfields and building foundation by mixing lime in huge quantity.
3. Lime slurry is utilized as mortar for masonry work and for plastering.
4. Lime is applied as an additive in asphalt to enhance the property of cohesion. Lime also makes the resistance strength of asphalt better towards stripping and aging.

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Published By

Rajib Dey

www.constructioncost.co

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Different Sorts Of Scaffolding

Definition of scaffolding

The impermanent framework containing platforms at various stages which permits masons to sit and continue their construction work at different height of building is termed as scaffolding. Scaffolding is required for masons to sit and put construction materials when the height of wall, column or any other structural members of a building exceeds 1.5m. It offers a temporary and a safe working platform for different types of work such as construction, maintenance, repair, access, inspection, and so forth.

Divisions of Scaffolding:

There are the following various divisions available:

Standards:

Standards indicate to the vertical member of the frame work that is used to support on the ground.

Ledgers:

Ledgers are the horizontal members which are running equivalent to the wall.

Braces:

Braces are diagonal members running or fixed on the standard to provide stiffness to the scaffolding.

Transoms:

While both the ends of put logs are sustained on ledgers, then they are called transoms.

Boarding:

Boarding is a platform which is horizontal to support workmen and elements which are supported on the put log.

Guard Rail:

Guard rails are supplied at the working level similar to a ledger.

Classification of Scaffolding

Scaffolding can be categorized into various kinds which are described below in a nutshell:

Single Scaffolding

For brick masonry works single scaffolding is widely used. This type of scaffolding contains a single framework of standards, putlogs, ledgers, etc. Standards are placed at a distance of about 1.2m from the wall at 2-2.5 m interval and are attached by ledgers at a vertical interval of 1.2 to 1.5m. One end of putlog is on the ledgers and the other one in the hole left in the wall at an intermission of 1.2 to 1.5m.

Double Scaffolding

Double scaffolding is usually used for stone masonry works. Stipulation of holes to withstand putlogs is tough enough, so double scaffolding is preferred containing two rows of standards segregated by ledgers. The first row of the scaffolding is located at 20-30 cm away from the wall and the next row is kept 1m away from the first row. Transoms are situated on the ledgers and the cross braces in the scaffolding assists to build them more powerful and durable.

Steel Scaffolding

Steel scaffolding is similar to mason scaffolding. It consists of steel tubes instead of wooden members. In such scaffolding, standards are placed at a space of 3m and are connected with the help of steel tube ledgers at a vertical interval of 1.8m.

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Published By

Rajib Dey

www.constructioncost.co

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