Skip to main content

Light-weight concrete


      Light-weight concrete :- It is prepared by using coke-breez, cinder or slag as aggregate in the cement concrete. This type of concrete possesses high insulating property.

Ø APPLICATION OF LIGHTWEIGHT CONCRETE:-

a)    Decks of long span bridges.
b)    Fire and corrosion protection.
c)    Covering for architectural purposes.
d)    Heat insulation on roofs.
e)    Insulation of water pipes.
f)     Filling for floor and roof slabs.
g)    Construction of partition walls and panel walls in framed structures.
h)   Production precast building blocks and low cost housing.


Ø Advantage:-

a)    It is governed primarily by economic considerations
b)    Reduced Seismic Forces
c)    Improved Structural Efficiency
d)    Reduces the dead load of a structure
e)    Smaller sections as well as smaller sized foundations can be used
f)     Formwork will withstand low pressures
g)    Improved Constructability
h)   Ease of Transport
i)     Pumping to large distances
j)     Self-compaction
k)    Quick production
l)     Improved hydration due to internal curing
m)  Ease of Renovation and repair
n)   Better thermal insulation
o)    Can be used as Designer Dirt for Geotechnical Stabilization.

Ø Disadvantage:-

One of the major disadvantages of lightweight concrete has been the inability to provide consistent compressive strengths and density throughout the entire area. Lightweight concrete derives its compressive strength from the molecules in the foam additive that — when properly mixed — form around the cement and serve as aggregate does in standard concrete mixes. If the foam additive is not properly mixed, there is a probability of foam collapse, which weakens the product’s compressive strength.

Comments

Post a Comment

Popular posts from this blog

1cum 250mm THICK BRICK WORK CALCULATION

1cum 250mm THICK BRICK WORK CALCULATION Brick size with mortar :- 250mm*125mm*75mm Volume of 1 brick with mortar:- 0.250*0.125*0.075 = 0.00234cum. Brick size with out mortar :- 240mm*115mm*65mm Volume of 1brick without mortar :- 0.240*0.115*0.065 = 0.00179. Nos of brick in 1cum with mortar:- 1/0.00234 = 427.4 = 427 Volume of 427nos brick without mortar:- 427*0.00179 = 0.76 cum Required of cement mortar :- 1-0.76 = 0.24cum. Now Dry volume of mortar :- 0.24*1.33 = 0.32 cum We know the mortar ratio :- 1:6 So, Cement :- 0.32*1/7*1440 kg = 65.8 = 66 kg Sand :- 0.32*6/7 cum = 0.27 cum.
Post a Comment
Read more

Types of bonds generally used in brick masonry.

Brick masonry is built with bricks bonded together with mortar. For temporary sheds mud mortar may be used but for all permanent buildings lime or cement mortars are used. The various types of bonds generally used in brick masonry are 1. Stretcher bond 2. Header bond 3. English bond and 4. Flemish bond. Stretcher Bond:   A stretcher is the longer face of the brick as seen in the elevation. In the brick of size 190 mm × 90 mm × 90 mm, 190 mm × 90 mm face is the stretcher. However care should be taken to break vertical joints. This type of construction is useful for the construction half brick thick partition wall.This bond is sometimes known as running bond. This bond is the simplest bond that is used today, this bond is not suitable as a stand alone structural wall and a structural wall built directly behind it, fixed with wall ties would be needed. Header Bond A header is the shorter face of the brick as seen in the elevation. In a standard...
Post a Comment
Read more

8 FACTORS AFFECTING SETTING & HARDENING OF CEMENT

8 FACTORS AFFECTING SETTING & HARDENING OF CEMENT:- THE IMPACT OF CEMENT’S COMPOSITION:- The mineral composition of cement and their ratios are the main factors affecting the setting and hardening of cement. As mentioned above, various mineral components will reveal different characteristics when reacting with water. For example, the increase of C3A can speed up the setting and hardening rate of cement, and the heat of hydration is high at the same time.Generally speaking, if mixed materials are added into the cement clinker, the anti-erosion will increase, and the heat of hydration and the early strength will decrease. THE MIXING AMOUNT OF GYPSUM:-Gypsum is called the retarding agent of cement which is mainly used for regulating the setting time of cement and is an indispensable component. Without gypsum, cement clinker can condense immediately by mixing with water and release heat. The major reason is that C3A in the clinker can dissolve in water qu...
Post a Comment
Read more