Standard Specification of Setting Time for Different Type of Cement – Depending upon the admixtures added into the cement in the process of manufacture of cement, the setting time differs for different cement. Standard setting times are listed in the below table as per IS Codes. Table-1: Setting Time for Different Type of Cement
|Cement Type||Initial Setting Time, min (min.)||Final Setting Time, min (max.)|
How do you find the initial setting time of cement?
Determination of Final Setting Time – Replace the needle (C) of the Vicat apparatus by the needle with an annular attachment (F). The cement shall be considered as finally set when, upon applying the needle gently to the surface of the test block, the needle makes an impression thereon, while the attachment fails to do so. The period elapsing between the time when water is added to the cement and the time at which the needle makes an impression on the surface of test block while the attachment fails to do so shall be the final setting time. In the event of a scum forming on the surface of the test block, use the underside of the block for the determination.
What is the setting time of 43 grade cement?
Physical Requirement for 43 Grade OPC (Ordinary Portland Cement)-(IS-8112) | March 5, 2014 | | When a 43 grade ordinary Portland cement is tested for its physical requirements, then it must satisfy the following specifications given by IS 8112.
The fineness value of 43 grade OPC when tested by Blaine’s air permeability method shall not be less than 225 m 2 /kg. The expansion value (i.e. soundness) of unaerated cement when tested by Le-Chaelier method shall not be more than 10 mm and when tested by autoclave method shall not be more than 0.8%. Initial setting time of 43 grade OPC shall not be less than 30 minutes. Final setting time of 43 grade OPC shall not be more than 600 minutes. The average compressive strength of at least 3 mortar cubes, when tested as per IS-4031-Part 6, shall be as follows.
|Sl.No||Time||Compressive strength (MPa)|
|1||72 ± 1 hour||Not less than 23 Mpa|
|2||168 ± 2 hour||Not less than 33 Mpa|
|3||672 ± 4 hour||Not less than 43 Mpa|
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Which test is used to find setting time of cement?
Free Gujarat Engineering Service 2019 Official Paper (Civil Part 1) 150 Questions 150 Marks 90 Mins The setting time of cement is of two types: 1) Initial Setting Time: It is defined as the time elapsed between the moments when water is added to the cement, to the time when the cement paste starts losing its plasticity.2) Final Setting Time: It is defined as the time elapsed between the moments when water is added to the cement, to the time when the cement paste has completely lost its plasticity.
|Le Chatelier apparatus||Soundness|
|Briquette testing apparatus||Tensile strength|
|Vicat apparatus||Consistency, Initial and final setting time|
|Casagrande’s apparatus||Liquid limit determination|
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What is the initial setting time *?
FAQ – What is initial & final setting time of cement? Initial setting time of cement is the time at which the cement paste starts losing its plasticity. Final setting time of cement is the time when the cement paste totally loses its plasticity. What is the initial setting time of cement? The time when water is added to cement to the time when the cement starts losing its plasticity is called initial setting time.
Initial setting time is the time when water is added to cement until the moment when the square needle penetrates to a depth of 33-35 mm from the top of the mould. Why is the initial setting of cement 30 minutes? The initial setting time of cement should not be less than 30 minutes because the time is required for handling operations of cement like mixing, placing, finishing, etc.
The cement operations cannot be carried out once the initial setting of cement occurs as cement paste starts losing plasticity which will then affect the strength gaining of the paste. What is cement setting? Upon addition of water, the cement paste formed remains plastic for some time.
What is initial setting time of OPC 43 grade cement?
Setting Time in Minutes
|Description||IS Requirement||Parasakti Results|
|Initial Setting time||Not less than 30 Minutes||130-160 Minutes|
|Final Setting time||Not more than 600 Minutes||230-260 Minutes|
What is meant by initial setting time?
2 The Setting Time – The setting time of cement includes the initial setting time and the final setting time. The initial time refers to the time that cement turns into paste by mixing with water and begins to lose its plasticity. And the time that cement completely loses its plasticity by mixing with water and begins to have a certain structural strength is known as the final setting time.
The national standards prescribe that the initial setting time of Portland cement should not be earlier than 45 min and the final setting time should not be later than 6.5 h. All the products off-grade at the initial setting time are spoiled products and those unqualified at the final setting time are sub-quality products.
The setting time of cement is measured by time determinator. The sample is the standard cement paste of which the temperature is 20 °C ± 3 °C and humidity is more than 90%. Various mineral components of the cement clinker are different in the water consumption of their normal consistency.
- The finer the cement is ground, the more water the normal consistency will need.
- The normal consistency of Portland cement is within 24% ~ 30%.
- The setting time of cement is very important in the construction projects.
- The initial setting time should not be too fast in order to ensure that there is enough time to complete every process, such as casting, before the initial setting time; and the final setting time should not be too late in order to enable the cement to complete its setting and hardening as soon as possible after pouring and tamping to make the next process occur earlier.
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