Self Compacting Concrete

The J-ring test is used to assess the passing ability of self-compacting concrete to flow through tight openings including spaces between reinforcing bars and other obstructions without segregation or blocking.
A narrow and wide bar spacing test is described. The narrow bar spacing simulates more congested reinforcement.
The J-ring test is an alternative to the L-box test EN 12350-10 although the result is not directly comparable.
The method follows the procedure detailed in EN 12350-8 Slump-flow and t500 time for
self-compacting concrete except that, before filling the slump cone with concrete, the Jring is placed concentrically over the cone. The J-ring consists of a ring of evenly spaced vertical, smooth bars.
In addition, the time when the concrete has flowed to a diameter of 500 mm t500 may be measured.

EN12350-12

The L-box test is used to assess the passing ability of self-compacting concrete to flow through tight openings including spaces between reinforcing bars and other obstructions without segregation or blocking. There are two variations; the two bar test and the three bar test. The three bar test simulates more congested reinforcement.
A measured volume of fresh concrete is allowed to flow horizontally through the gaps between vertical, smooth reinforcing bars. The height of the concrete behind the bars and at the end of the end of the box is measured and the ratio determined which enables the passing or blocking behaviour of SCC to be estimated.

EN12350-10

The slump-flow and t500 time is a test to assess the flowability and the flow rate of self compacting concrete in the absence of obstructions. It is based on the slump test described in EN 12350-2. The result is an indication of the filling ability of self compacting concrete. The t500 time is also a measure of the speed of flow and an indication of the viscosity of the self-compacting concrete.
The fresh concrete is poured into a cone as used for the EN 12350-2 slump test. When the cone is withdrawn upwards the time from commencing upward movement of the cone to when the concrete has flowed to a diameter of 500 mm is measured; this is the t500 time. The largest
diameter of the flow spread of the concrete and the diameter of the spread at right angles to it are then measured and the mean is the slump-flow.

900x900x15mm

EN 12350-8

The V-funnel test is used to assess the viscosity and filling ability of self-compacting concrete.
A V shaped funnel is filled with fresh concrete and the time taken for the concrete to flow out of the funnel is measured and recorded as the V-funnel flow time.

EN12390-9