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Setting of cement is the initial solidifying of the cement.
I presume you will not be using a cement material by itself, but by mixing in aggregates and fines to create 'concrete' I will continue this answer talking about concrete but much still applied to a simple cement mortar also.
Depending on temperature (warm fast, cold slow) initial set will be between 2 and 24 hours. This will result in a concrete material that can easily be marked with a fingernail.
Once the concrete has set, the concrete goes through a process called curing or 'hardening' where the pozzolanic constituents of the concrete 'hydrate' (react with the water) to create a hard material. This will continue for the life of the concrete but the most significant strength gains will be noticed within the first 28 days and this is the strength normally taken as the design strength of the concrete.
It can be expected in ideal conditions with warm air and a light breeze in the air, for the concrete to achieve
30% of it's 28 day strength in 1 day
60-80% in 3 days
80-100% in 7 days
and 100-% in 28 days
Many factors will affect this.
temperature will have a large impact.
additives such as retarders and accelerators can be added to slow and speed up the hardening process respectively.
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How gypsum effect the setting time of cement?
gypsum increase the setting time of cement.
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 different types of cement?
Type-I - Ordinary portland cement used in general constructionType-II - Portland pozzolana cement , moderate heat of hydrationType- III - Rapid hardening cement used for quick setting worksType-IV - low heat cement, low heat of hydrationType-V - Sulphate resisting cement used in sewage linings,marine construction.
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 are the special cements?
There are 15 types of cements such as-1.)O P C cement, 2.) P P C cement 3.) Low heat cement 4.) Quick setting cement 5.) White cement 6.) Coloured cement. 7.) Blust Furnace Slag cement and so on
What is rain forced cement concrete?
It is not rain forced but re-inforced cement concrete. It means the concrete after setting and hardening.
What types of cement otherthan portlandcement?
Rapid hardening cementExtra rapid hardening cementExpansive cementSulphate resisting cementQuick setting cementColored cementWhite cementHydrophobic cementHigh alumina cementBlast furnace slag cement
What is hardening of concrete?
Cement when mixed with sufficient quantity of water,the compounds present in cement reacts with water to form a cementitious crystalline structure that adheres to the sand and aggregates.This helps in binding the mass together and increases its strength till it becomes very hard.This is called hardening of cement.
The difference between setting and hardening in cement?
SettingSetting begins to occur after the concrete is mixed and even before pouring. The cement in the concrete begins to stiffen after mixed with water. The concrete is beginning to change from liquid form to solid form. During the setting process, the concrete does gain strength, which is the beginning of the hardening process. When the water ingredient is added to the concrete mix, the concrete is still pliable and flexible, sort of a paste. There is two stages of setting: initial and final setting. Initial setting is when the concrete loses it flexibility and begins to harden. Final setting is when the concrete can sustain some load, but still has some moisture within the mixture.HardeningHardening of the concrete is the stage when the mixture gains strength. The cement ingredient begins to attach itself to the aggregate as the water dries off the mixture. The hydration of water is what starts the hardening process. It generally takes five to seven days for the concrete to complete the hardening process. The easiest way to increase the strength of concrete is to add cement to the mixture. The more water used in the mixture, the weaker the concrete and it will also delay the hardening process. Once the concrete has hydrated all the water from the mixture, the hardening process is complete and the concrete is as strong as it will get.
What is the definition of the word hardening off?
Setting.
What is false setting of cement?
False-setting is when cement abnormally and prematurely sets.
How gypsum effect the setting time of cement?
gypsum increase the setting time of cement.
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...
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).
Why gypsum added to cement?
3% of gypsum is added to cement to "prevent the rapid setting of cement"
How does the fineness affect the time of setting?
Setting begins to occur after the concrete is mixed and even before pouring. The cement in the concrete begins to stiffen after mixed with water. The concrete is beginning to change from liquid form to solid form. During the setting process, the concrete does gain strength, which is the beginning of the hardening process. When the water ingredient is added to the concrete mix, the concrete is still pliable and flexible, sort of a paste. There is two stages of setting: initial and final setting. Initial setting is when the concrete loses it flexibility and begins to harden. Final setting is when the concrete can sustain some load, but still has some moisture within the mixture. Hardening
