Showing posts from November, 2013

Compaction Factor Test for Fresh Concrete

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Aim: To find out the compaction factor for the given fresh mix of concrete.Theory: Work-ability of concrete is the ability/ease with which concrete can be mixed, transported and placed. This is a major factor which contributes to the other properties of concrete also. If concrete is workable enough then it can be compacted with less compacting effort. So there is a relation between the amount of work required to compact a given fresh concrete and the work-ability of the concrete. This relation is well suited for the concrete of the low water cement ratio. Slump cone test is also used to find out the work-ability of the concrete but only recommended for the concrete of higher work-ability. For less workable concrete(having less water cement ratio), compaction is standardized by various standards. Apparatus: Compaction factor apparatus/machine, weighing balance, cow/mixing tray.

Procedure: 1. Oil the inner sides of the top and bottom cone …

Concrete Slump Test

Aim: To determine the slump of a given fresh concrete mix sample. Theory:Work-ability is the ease with which the given concrete mix can be mixed together, transported to the application place and can be placed/applied/compacted their within the initial setting time of cement. This property depends largely on the amount of water added i.e. water cement ratio of the concrete mix and kind of aggregates used. Generally work-ability increases with the addition of the water, however it results in the less strength of concrete. So we have to settle for an intermediate value of water cement ratio at which it may have the sufficient work-ability as well as sufficient strength.

Apparatus: Slump cone apparatus, cow tray
Slump Cone Apparatus:
This is the standard apparatus used to determine the slump of the  given fresh concrete. This is a metallic, conical shaped, of height 30 cm, 20 cm, and 10 cm as the larger and smaller diameters respectively at the far two ends. This is provided with two handle…