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Fill Box Test Method for Self Compacting ConcreteFill box test is also known as ‘Kajima test’ is used to measure the filling ability of self compacting concrete with a maximum aggregate size of 20 mm. The apparatus consists of a container (transparent) with a flat and smooth surface. In the container are 35 obstacles are made of PVC with a diameter of 20mm and a distance centre to centre of 50mm, see figure. At the top side is a put filling pipe (diameter 100mm height 500mm) with a funnel (height 100mm). The container is filled with concrete through this filling pipe and difference in height between two sides of the container is a measure for the filling ability.
Assessment of Fill Box TestThis is a test that is difficult to perform on site due to the complex structure of the apparatus and large weight of the concrete. It gives a good impression of the self compacting characteristics of the concrete. Even a concrete mix with a high filling ability will perform poorly if the passing ability and segregation resistance are poor.
Equipment for Fill Box Test
- Fill box of a stiff non absorbing material
- Scoop 1.5 to 2 liter
Fig.: Detail of fill box empty and filled with concrete