Clc Bricks Project Analysis

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  • Topic: Concrete, Fly ash, Portland cement
  • Pages : 16 (3027 words )
  • Download(s) : 245
  • Published : December 28, 2012
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PROJECT PROFILE
FOR

CELLULAR LIGHT WEIGHT (CLC)
&
SAND LIME BRICKS

PREPARED BY

8TH FLOOR, PARISHRAMA BHAVANAM,
BASHEERBAGH, HYDERABAD
www.apitco.org

1.1

INTRODUCTION

CLC (Cellular Lightweight Concrete):
It is a version of lightweight concrete that is produced like normal concrete under ambient conditions. It is produced by initially making a slurry of Cement +Sand + Fly Ash (constituting 26% - 34 % content) + water, which is further mixed with the addition of preformed stable foam in an ordinary concrete mixer under ambient conditions. The mixture is either poured or pumped into assembled moulds of blocks or formwork of reinforced structural elements or poured onto flat roofs or voids for thermal insulation or filling. The foam imparts free flowing characteristics to this slurry due to ball bearing effect of foam bubbles enabling it to easily flow into all corners and compact by itself in the moulds/forms without requiring any kind of vibration or compaction. Sand Lime Bricks (SLB):

Sand lime bricks are manufactured by mixing sand, fly ash and lime in desired proportion that may be followed by chemical accelerator during wet mixing. This mixture is moulded under pressure.
The green bricks can be air cured for 24-48 hours and then steam cured in autoclave at desired pressure and temperature. The green bricks may be steam / hot water cured at atmospheric pressure also.

In presence of moisture, fly ash reacts with lime at ordinary temperature and forms a compound possessing cementitious properties. After reactions between lime and fly ash, calcium silicate hydrates are produced which are responsible for the high strength of the compound. Bricks made by mixing lime and fly ash are, therefore, chemically bonded bricks. These bricks are suitable for use in masonry just like common burnt clay bricks. These bricks have the following advantages over the clay bricks: 1. Possess adequate crushing strength as a load-bearing member. 2. Have cement colour in appearance, are uniform in shape and smooth in finish and require no plastering for building work.

1
PROJECT PROFILE FOR CLC & SAND LIME BRICKS

3. They are lighter in weight than ordinary clay bricks.

Generally, dry fly ash available from power plants meets the properties specified in IS: 3812 and is suitable for manufacture of Fly Ash – lime bricks in accordance with the requirements of IS : 12894.

Sand Lime Bricks or Decorative bricks are made of sand and lime mixed with water and then pressed in an atmosphere of steam for hardening. It is a firebrick made of refractory silica sand with lime as a bonding agent. Brick made with sand and slaked lime rather than with clay; usually a light grey or off-white color.

In presence of moisture, fly ash reacts with lime at ordinary temperature and forms a compound possessing cementitious properties. After reactions between lime and fly ash, calcium silicate hydrates are produced which are responsible for the high strength of the compound. Bricks made by mixing lime and fly ash are, therefore, chemically bonded bricks. These bricks are suitable for use in masonry just like common burnt clay bricks. These bricks have the following advantages over the clay brick: 1. Possess adequate crushing strength as a load-bearing member 2. Have cement colour in appearance, are uniform in shape and smooth in finish, require no plastering for building work and consume less mortar 3. Are lighter in weight than ordinary clay bricks

4. They can produced in desired colours

1.2

MARKET

Construction industry boom can be seen in almost all the developing countries. The demand for supplies is high; supply of raw material like bricks, cement, sand, iron and steel, builder hardware, paints, manpower and everything else regarding construction.

The construction industry is also very vital because anybody who is concerned with economic development these days highlights the need for infrastructure

2
PROJECT PROFILE...
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