What are the details of the following things Sitting time ,...

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What are the details of the following things  Sitting time , WATERCONT...

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SEING TIME When water is added to cement the cement paste starts to looseits plasticity and becomes hard The time taken by the cement pasteto completely loose its plasticity and becomes hard is calledSetting time It is measurd with Vicat apparatus Initial setting time The time period between water added tocement and cement paste starts to loose its plasticity or The time period ellapsed between the moment water is added tothe cement and the needle of Vicat apparatus fails to penetrate themould of 5mm when measured from bottom Final setting time The time period between the moment wateradded to cement and cement paste completely looses itsplasticity or The time period between the moment water added to cement and thetime which the needle of Vicat apparatus makes an impression onsurface of the mould while the apparatus fails to do so is calledFinal setting time Water content and Slump test The ratio of water mixed in concrete is very important If thequantity of water is too less then hydration of cement will not beproper it results into porus and week concrete If the quantity ofwaer is too high then concrete will be more workable but does notgive sound concrete Hence proper water cement ratio is must toprepare a concrete mix For this purpose we generally use SlumpCone test The cone is a steel one and of 30 cm high 20 cm diameter atbase and 10cm diameter at top and also provided with andles atsides Concrete is filled in the cone in layers of 75 cm at a timeeach layer tamperd with a steel rod 25 times Just after slump conehas filled it is lifted with the help of handles The extent bywich the concrete drops is called ....

What are the details of the following things: Sitting time , WATER CONTENT Slump test ,...

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Civil Engineering

What are the details of the following things: Sitting time , WATERCONTENT Slump test , Flow teble ,Shear strength ASTM ,Consolidation test

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