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Ready Mix Concrete

Mon Nov 16, 2009Total posts : 6
Girish
Girish
Join date: Oct 2009
Topic: Ready Mix Concrete

We can use diff. factors which can give more strength and satisfy the requirement

READY MIX CONCRETE

- Cement Type :  OPC / MSRPC / SRC ?

- Water Cement Ratio ?

- Admixture ?

- Fly Ash ?

- Fiber Reinforcement

- Micro Silica ?

Tue Nov 17, 2009Post  #1
Girish
Administrator
Girish

Join date: Oct 2009
Post subject: FLY ASH

% Fly Ash = % Cement Reduction?

?? 30MPa Mix – 300 kg cement

?? 40% cement replacement = 120 kg

?? “40% Fly Ash Mix”

144 kg fly ash

216 kg cement

360 kg total CM

Actual cement reduction = 84 kg

( only a 28% reduction)

 
Tue Nov 17, 2009Post  #2
Girish
Administrator
Girish

Join date: Oct 2009
Post subject: FLY ASH USE

?? 50% cement replacement

?? Footings

?? Columns

?? 45% cement replacement

?? Walls

?? 40% cement replacement

?? Suspended slabs

?? Slabs-on-grade

 
Tue Nov 17, 2009Post  #3
Girish
Administrator
Girish

Join date: Oct 2009
Post subject: Why Fly Ash ?? replacing cement content ?

1 TONNE OF CEMENT:

- Releases 1 tonne of CO2

Consumes 5 million BTU of energy

Uses 2 tonnes of raw materials

FLY ASH:

- Is a waste product or the coal industry

- Benefits include:

- Improved concrete properties

- Environmental

- Economic

 Challenges include:

- Lower early strength gain

- Curing

 
Sun Nov 22, 2009Post  #4
Girish
Administrator
Girish

Join date: Oct 2009
Post subject: WATER CEMENT RATIO

 

What is this term Water Cement Ratio all about ??

 

Ratio of weight of Water to the weight of cement used in the concrete mix.

 

150  kg of water to a mix with 300 kg of cement  is 50 %

 

Lesser the water – the concrete gets more strength and durability.

But workability reduces with reduction in water.

 

Solution.

Use admixtures.

Use of pozzolan maerials (Fly ash or blast furnace slag)  or silica fume, rice hull ash or natural pozzolans.

 

 

The theory

 

Concrete hardens as a result of chemical reaction between cement and water which is known as hydration.  For every 2 kg of cement 0,5 kg of water is needed to fully complete reaction.  This result in water cement ratio – 25% ( 1:4)

 

But practically in such ratio, the mix is too dry and the reaction between water and cement doesn’t happen completely through out the mix as some of the water will be even taken by sand and stone. So more water is used to make sure their happens a complete hydration reaction.

 

So 30% to 40% is generally achieved and considered as a good water cement ratio.

 

 

Too much water will result in settling and segregation of sand and stone components in the mix.  (sand on top layers and stone will be found then at the bottom)

More internal crack. Less strength  will be problems to face in use of more water.

 

 
Sun Nov 22, 2009Post  #5
Girish
Administrator
Girish

Join date: Oct 2009

adding on to the above.

Water cement ration concept is more applicable to the Structural element of building.

columns, slabs etc  Which actually take care of load factors.

The roof screed, floor screed etc doesnt considered as a structural element. rather as a protection element .

 
Sat Dec 05, 2009Post  #6
Girish
Administrator
Girish

Join date: Oct 2009
Post subject: More about fly ash - Environmental Impacts

in the year 2008 india proudced about 140 Million tons of fly ash in its coal fired thermal power stations.  Only about 25% of its being recyled in 2009. or put to beneficial use. with major portion being in the constuction industry.

 

Disposal of ununsed ash is mainly done by creating ash heaps or washign the ash with water in slurry form into large lagoons. Both disposal routes are costly and Environmentally damaging.

Nasik thermal power station is the second largest power station in Maharashtra consisting of 5 coal fired boilers with a total generation capacity of 910 MW.

the ashes been displosed into lagoons.  and suprisingly these lagoons contain cumulative deposits of more than 37 million tons of ash

now reconsile the above figure with the fact that fly ash can replaces about 25% to 70% of Oridinary port land cement !!!!!

 

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