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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.
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What is the different between ordinary Portland cement and Portland cement?
Ordinary Portland cement is the most common cement used in the world, made from stucco, concrete, mortar and other materials. Slag cement is usually mixed with Portland cement and is the substance leftover after metal has been smelted from raw ore.
Difference between ordinary Portland cement and puzzalona Portland cement?
OPC - Ordinary Portland cementOPC - Materials used - Argillaceous and calcareous materialsPPC - Portland Pozzolona CementPPC - OPC + Pozzolonoc materials(fly ash, volcanic ash, pumicite at the time of grinding).
What is the specific gravity of portland cement?
According to ASTM C188 the specific gravity of Portland cement is roughly 3.15According to ASTM C188, the specific gravity of portland cement (without voids between particles) is about 3.15. In other words, portland cement is about 3.15 times heavier than water.
What is the function of cement in making concrete?
Cement, or more correctly, Portland cement, named after the person who perfected making it, is essentially limestone that is burned in a kiln, then pulverized to a fine, fine dust. Think of Portland cement as 'Instant limestone', because when you mix it with water, the water chemically combines with the cement to form a hard, hard product that is durable, has high compressive strength, and resembles limestone. After the Portland cement dust is made, it is mixed with a large proportion of clay -- just plain, ordinary potter's clay -- and also a bit of gypsum and other trace ingredients that all work to make the cement set up harder and faster. In concrete, Portland cement makes the concrete "cure", to set up, that is, to chemically combine with the water. The product is a very durable, very strong, very fast-curing aggregate, using sand and stones to fill in between each other and the cement particles.
Which step in the production of portland cement causes a chemical change?
For example the heating of limestone mixed with other raw materials.
Is cement a rock?
From the Portland Cement Association:Bricklayer Joseph Aspdin of Leeds, England first made portland cement early in the 19th century by burning powdered limestone and clay in his kitchen stove. By this crude method he laid the foundation for an industry which annually processes literally mountains of limestone, clay, cement rock, and other materials into a powder so fine it will pass through a sieve capable of holding water. Cement is so fine that one pound of cement contains 150 billion grains.So, I think you could say that cement is a rock (limestone) derivative.
Why is the chemical property of an isotope similar?
Isotopes differ each other from the number of neutrons which is a chemically inert subatomic particle.
What is clinker role in cement production?
Clinker is ground (usually with the addition of a little gypsum, that is, calcium sulfate dihydrate) to become Portland cement. It may also be combined with other active ingredients or chemical admixtures to produce:
How many types of cement are there?
Basically there are three types of cement namely,OPC - Ordinary Portland CementPPC - Portland Pozzolona CementSpecial CementsBasically we can divide cement in different types-Natural cementPozzolanic cement:Portland cementHigh alumina cementSuper sulphate cementSpecial cement
Is mixing cement and water reversible?
Portland cement (and the concrete, mortar, thin set, or other masonry product made from it) doesn't dry. Rather, it cures by a chemical reaction initiated by putting water in it. The reaction is irreversible; hence, adding water to cement is an irreversible change.
How heavy is a bag of cement?
From the largest manufacturer of backaged Portland Cement, bags come in 92.5 lb bags. To be clear, cement is mixed with sand and often aggregate (pea-gravel up to much larger rocks or other things such as broken out concrete chunks) to make concrete. Portland Cement by itself has no structural integrity when mixed with water. It must be mixed with sand at a minimum to make a hard, useful product (concrete). Concrete comes in bags weighing 50, 60, and 80 pounds here in the US.From the largest manufacturer of backaged Portland Cement, bags come in 92.5 lb bags. To be clear, cement is mixed with sand and often aggregate (pea-gravel up to much larger rocks or other things such as broken out concrete chunks) to make concrete. Portland Cement by itself has no structural integrity when mixed with water. It must be mixed with sand at a minimum to make a hard, useful product (concrete). Concrete comes in bags weighing 50, 60, and 80 pounds here in the US.
Is concrete a compound an element or a mixture?
Concrete is a composite construction material, composed of cement (commonly Portland cement) and other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate made of gravel or crushed rocks such as limestone, or granite, plus a fine aggregate such as sand), water and chemical admixtures.
