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Well the density is not as straight forward it depends on the mix design and RD of the cement as well as the PFA(Fly ash) and any other material you add.
Take the following RD for the example
Cement = 3.17
PFA(Fly ash) = 2.58 (I suggest you calculate this value i got different results ranging from 2.25-2.58)
Sand and aggregate = 2.65
Now there are two types of design approaches you can do here, either you have a specific density to reach or certain strength.
We decide on ratios for a specific strength(note when having a certain density to achieve it is hard to achieve a specific strength and lab tests will be needed)
for the example take
Cement:PFA:Agr = 1:1:2
water/cement ratio = 0.45
Fist estemate
KG Liters
Cement 500 158
PFA 500 189
Agr 1000 388
Water 225 225
Total 2000 960
after some iterative proses the liters get 1000 or 1m3
KG Liters
Cement 525 166
PFA 525 204
Agr 1050 396
Water 236 236
Total 2100 1000
This mix will give a density of 2100 kg/m3
For a specific density you play around with the ratios.
*Note that in theory the water doesn't contribute to the weight due to evaporation and H+ atoms being used by the cement have almost no weight, but in practice about 80% water doesn't contributes(this may vary for thicker or thinner concrete)
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∙ 14y ago
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What do you add to fly ash to make cement?
Fly ash is an ingredient in cement manufacturing. The main components of cement are limestone, clay, sand, and fly ash. The cement folks are interested in the silica and alumina in the fly ash, so depending upon the amount of those in the fly ash allows them to decrease the amount of clay and sand which is where they get those constituents if they don't use fly ash. The advantage is to decrease the volume of clay and sand that have to be mined, realizing a cost savings as well as saving the clay and sand for future generations.
How does Portland cement differ chemically from other cement?
I assume you are contrasting portland cement with fly ash to portland cement with powdered slag? (Fly ash is from coal furnaces, powdered slag is from oil-burning furnaces). Slag is very similar to portland cement, and can be used to cheaply replace up to 50% of portland cement in concrete. This is less expensive, and the slag makes the hardened concrete more resistant to de-icers. Fly ash is not similar to portland cement, but is also good to resist de-icers. But since fly ash is not similar to portland cement, only 20 to 30% of portland cement can be replaced by it. The main difference in chemistry are the amounts of oxygen-containing elements. (Called 'oxides'). For example, portland cement has 65% of C2O, Slag cement has 45%, and Fly ash contains 25% For SiO2 portland cement 20%, Slag cement 33%, and Fly ash 37% For Al2O3 portland cement 4%, Slag cement 10%, Fly ash 16%. There are other very minor differences in chemistry.
What is the density of the fly ash?
Between 2.0 - 3.0
What is the function of the cement?
Functions of fly ash in cement,It is used as a replacement material.Low heat of hydrationGains strength more than that of the ordinary cement.
What is the function of flyash in cement?
Functions of fly ash in cement,It is used as a replacement material.Low heat of hydrationGains strength more than that of the ordinary cement.
Can you use fly ash and cement mix for plaster without using sand?
becuse
What is fly ash how can you earn wealth from it?
Fly ash is a common term for the final product of coal after combustion. The white ash has properties similar to portlan cement. Since portlan cement is a comon binder in concrete it has a multitude of construction applications. The way you can earn wealth from Fly ash is to sell the ash too the concrete market. Fly ash is rate based of of it's composition though and it's composition is based off of the product combusted to produce it. Hope this helps and yes it is harmful to the enviroment...i think :)
What has the author K Hennig written?
K. Hennig has written: 'The technology and the material conditions for the manufacture of pozzolama [sic] cement using fly-ash' -- subject(s): Fly ash, Pozzuolanas
Raw materials for cement?
The raw materials used in cement are,Calcareous materials (limestone)Argillaceous materials (clay)GypsumPozzolanic materials (fly ash, pumicite)
Why ash is used in cement?
When ash is used in cement it is called pozzolanic cement.Use of ash reduces heat generation in cement.Ash is used as a cement replacement material.
What is pozzolanic cement?
Pozzolanic cement is a cement which consists of pozzolanic materials like fly ash, volcanic ash, pumicite,etc.,A Pozzolan is any material which in the presence of lime and water will react hydraulically to form a cemented massContains pozzolanic materials of 10-95% by weight.Pozzolanic cement can be made from 95 % recycled materialsprovides many improved performance ove OPC. (ordinary portland cement)It is generally used now a daysLess heat evolved when compared to OPC.
Density of cement according to Indian standards?
what is cement density
