0
What else can I help you with?
What is the importance of setting time of cement?
because when we know the setting time of cement we easily identified that where can we use the cement according to there setting time.
What are the factors affecting the initial setting time of cement?
When cement is mixed with water, it forms slurry which gradually becomes less plastic with the passage of time & finally a hard mass is obtained. In this process, at a certain stage when the cement paste is sufficiently rigid to withstand a definite amount of Pressure, it is said to have set & the time required to reach this stage is termed as "setting time".
What is vicat apparatus used for?
vicats apparatus is used for initial setting time of cement.
What is initial and final setting time in cement according to ASTM?
Using a Vicat needle, the ASTM determined time for initial concrete setting is equal to or greater than 45 minutes. They set the final setting time is equal to or greter than 375 minutes.
What is the importance of standard consistency test?
by standard consistency test we determine standard consistency of cement which is denoted by p. as we know standard consistency value for a cement its value is used for making the paste for determining setting time, soundness, compressive strength of cement
Why 2 of gypsum is added to cement?
Gypsum is added to cement to decrease the setting time.
Why 2 gypsum is added in the cement?
The construction industry uses both the natural and the synthetic forms of gypsum in Portland cement manufacturing. Although the amount of gypsum used in the mix represents a small percentage of the volume of all ingredients, gypsum has important functions.
How much percentage gypsum added in cement?
Typically, about 3% to 5% gypsum is added to cement during the manufacturing process. Gypsum helps to regulate the setting time of cement, preventing it from setting too quickly. This addition is crucial for achieving the desired workability and final strength of the concrete.
What minerals are used to make cement?
The primary minerals used to make cement are limestone, clay, and gypsum. Limestone provides calcium and clay provides silica and alumina, which are necessary for the chemical reactions that occur during cement production. Gypsum is added to regulate the setting time of the cement.
What is the effect on setting time of cement if water added is less or more than 85 percent of normal constituency of cement?
how the water mixed with cement affects the time of its setting
What are the name of admixture that effect on the setting time of cement?
retarder increases time to set, accelerator decreases setting time
What is the function of gypsum in cement?
Gypsum is a mineral that contains up to 88% CaSO4.2H2O. this compound Calcium Sulphate dihydrate is responsible for retarding the setting time of cement. the action of Calcium Sulphate dihydrate is such that it inhibits the speed at which Calcite (C3S) molecules bind with water to set thus creating a cement that is workable.
Does gypsum improve strength if added to concrete?
Gypsum can improve the workability and setting properties of concrete, but it does not significantly enhance the overall strength of the concrete itself. Instead, gypsum is primarily used to control the setting time of cement and to prevent flash setting. While it helps in achieving a more uniform mix and can contribute to durability, the primary strength gains in concrete come from the hydration of cement and the aggregate properties. Therefore, while gypsum plays a supportive role, it is not a primary strength-enhancing additive.
What is the importance of setting time?
because when we know the setting time of cement we easily identified that where can we use the cement according to there setting time.
Can you reuse the cement after it has crossed its setting time?
yes, if it is before the initial setting time...
What do you use calcium for cement?
Calcium is used in cement primarily in the form of calcium oxide (lime) and calcium sulfate (gypsum). It plays a crucial role in the hydration process, which helps in the hardening and setting of cement. Calcium compounds enhance the strength and durability of concrete, improve workability, and regulate the setting time. Additionally, they contribute to the overall chemical stability of cementitious materials.
What is the importance of setting time of cement?
because when we know the setting time of cement we easily identified that where can we use the cement according to there setting time.
