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The raw material used for manufacture of cement are limestone and clay. They are ground to form very fine powder and then converted to slurry. The slurry is baked at very high temperature to form granular mass called kilnker. The kilnker is ground and mixed with powdered gypsum to form cement.
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Fine grained material used in cement?
The fineness of cement has an important bearing on the rate of hydration and hence onthe rate of gain of strength and also on the rate of evolution of heat. Finer cement offers agreater surface area for hydration and hence faster the development of strength.
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.
Why does concrete harden?
A chemical reaction which is called hydration between the cement & water (also called 'curing') and which takes TIME mostly, it can still be hardening a hundred years later!
What are the causes of unsoundness of cement?
Unsoundness is caused by a increase in volume (eg due to hydration products) which occurs after the cement paste has set. The larger particles in coarse cement continue to hydrate well after the rest of the paste has set around them. Therefore any subsequent volume increases cannot be absorbed by the plasticity of the paste, and expansive cracking may occur.
What are bogues compounds?
Tricalcium silicate(C3S) ALITE (gives early strength to cement....heat of hydration is 120 cal/gm) Dicalcium silicate(C2S) BELITE (gives later strength ie after 7 days...less heat of hydration) Tricalcium aluminate(C3A) CELITE (gives INITIAL strength...high heat of hydration ...320 cal/g) Tetracalcium alumino ferrite(C4AF), FELITE (very high heat of hydration) - K @ $ ! civil engineering... GITAM UNIVERSITY
When cement is allowed to set why does it give off heat?
The hydration of cement is an exothermic reaction. Three exothermic reactions are important: - hydration of gypsum and tricalciumaluminate - hydration of dicalciumsilicate - hydration of tricalciumsilicate
Why is gypsum added to Portland cement?
Gypsum is added to portland cement to retard C3A hydration
What happens when you mix water with cement?
When water is mixed with cement, a chemical reaction called hydration occurs. This reaction causes the cement particles to bind together and transform into a solid material, which is known as concrete. The water helps to initiate the reaction and also provides the necessary environment for the hydration process to take place.
What does the fineness of the cement indicate?
That indicates higher hydration rate of the cement , thus faster to achieve the desired resistance.
What hydroxide is in cement?
Calcium hydroxide is one of the key compounds found in cement. It forms during the hydration process of cement when water is added to the cement mixture, leading to the setting and hardening of the material.
What is the cement hydration?
Hydration process is a chemical reaction takes place between cement and water.Heat of evolution takes place.C3A > C3S > C4AF > C2SC3S + H2O ------> Ca(OH)2On account of hydration certain products are formed which have adhesive and cementing value.
Meaning of hydration in concrete?
Hydration in concrete refers to the chemical reaction between water and cement which causes the mixture to harden and gain strength. This process is crucial for the development of the concrete's properties and durability. Proper hydration is necessary to ensure the concrete reaches its desired strength and durability.
What are the components of concrete?
cement fine aggregates and course aggregates and water for the hydration of cement are the main component of plain cement concrete. and for RCC M-S bars are used with these component.
What is the first stage of hydration in cement?
The first stage of hydration in cement is the initial reaction between water and the cement particles, which leads to the formation of a gel-like structure. This process begins almost immediately upon mixing, causing the cement to absorb water and swell. The primary compounds in cement, such as tricalcium silicate (C3S) and dicalcium silicate (C2S), react with water to produce calcium silicate hydrate (C-S-H) and calcium hydroxide (Ca(OH)2), which are essential for strength development. This stage is crucial, as it sets the foundation for subsequent hydration reactions and the overall hardening process.
What type of energy causes cement to dry?
The type of energy that causes cement to dry is chemical energy. When water is added to cement, a chemical reaction called hydration occurs, where the water molecules react with the cement particles to form new compounds. This reaction releases energy in the form of heat, which helps to drive the hardening and drying process of the cement. The hydration process is essential for the formation of strong and durable concrete structures.
What is hydration of concrete?
Hydration of concrete is a chemical reaction that occurs between cement and water, resulting in the formation of bonds between cement particles and aggregates. This process is essential for the concrete to harden and develop its strength and durability over time. Proper hydration is crucial for achieving desired concrete properties and ensuring long-term performance.
Fine grained material used in cement?
The fineness of cement has an important bearing on the rate of hydration and hence onthe rate of gain of strength and also on the rate of evolution of heat. Finer cement offers agreater surface area for hydration and hence faster the development of strength.
