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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.
What else can I help you with?
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 kind of rocks are in Portland cement?
Kinds of portland cement:Type - 1 - Ordinary portland cementType - 2 - Portland pozzolana cementType - 3 - Rapid hardening cementType - 4 - Low heat cementType - 5 - Sulphate resisting cement.
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.
How can I make Portland cement?
To make Portland cement, you need to combine limestone, clay, and other materials in a kiln at high temperatures. This process, called calcination, creates a powder that is then mixed with gypsum to form the final cement product.
What is Portland slag cement and slag cement?
Portland slag cement is a type of blended cement that combines Portland cement with ground granulated blast-furnace slag (GGBS), a byproduct of steel production. This mixture enhances the durability, strength, and resistance to sulfate attack of concrete while reducing the environmental impact of cement production. Slag cement, on the other hand, refers specifically to the use of GGBS as a partial replacement for Portland cement in concrete, contributing to improved performance in various applications. Both types of cement are used in construction to create more sustainable and resilient structures.
Is portland stronger than cement?
Portland cement is a key ingredient in concrete and is generally stronger than many other materials when cured properly. However, the term "stronger" can vary based on context—while Portland cement has high compressive strength, its tensile strength is lower, which is why it is often combined with other materials like steel to enhance overall strength. In summary, Portland cement is strong in compression but not necessarily stronger than all materials in every aspect.
Why it is called opc cement?
OPC cement stands for Ordinary Portland Cement, named after the Portland stone, a type of limestone quarried on the Isle of Portland in England. The term reflects its composition and the fact that it resembles the stone in color and quality. OPC is the most commonly used type of cement in construction due to its strength and versatility. Its designation as "ordinary" distinguishes it from other specialized types of cement that may have specific properties or applications.
Which step in the production of portland cement causes a chemical change?
For example the heating of limestone mixed with other raw materials.
Why is Portland cement stronger than Plaster of Paris?
Portland cement is stronger than Plaster of Paris primarily due to its composition and hydration process. Portland cement contains a mixture of calcium silicates and other compounds that, when mixed with water, undergo a chemical reaction called hydration, resulting in a dense and durable structure. In contrast, Plaster of Paris is made from gypsum, which hydrates to form a softer, less dense material that is more suitable for decorative applications rather than load-bearing uses. Additionally, Portland cement has a higher compressive strength, making it ideal for construction purposes.
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.
