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BUILDING INDUSTRY EXPERTISE SINCE 1889

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BUILDING INDUSTRY EXPERTISE SINCE 1889

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Slab Stopend – Construction Joints

Indicative clear distance between supports at slab joints

Overall depth of slab joint Max.Concrete Pressure Clear distances between the Hy-Rib supports
Theoretical *
Table2
CIRIA 108
assummed
for Hy-Rib
Grade
2411
Grade
2611
Grade
2811
mm  kN/m²  kN/m²  mm  mm  mm
250  6.25 3.20 1250 1025 950
500 12.50 6.30 900 725 675
750 18.75 9.50 725 600 550
1000 25.00 12.70 625 500 475
1250 31.25 15.80 575 450 425
1500 37.50 19.00 525 425 400
2000 50.00 25.30 450 375 350
2500 62.50 31.70 400 325 300
3000 75.00 38.00 375 300 275

 

Technical Support

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NOTES

The Hy-Rib is used in horizontal sheets with the ribs pointing into the concrete to be placed, and spanning in the strong direction between vertical supports. * The theoretical maximum pressure is that calculated using Table 2 in CIRIA Report 108 (Ref. 2) with a concrete density of 25 kN/m3, for EITHER a wall, a base or a column; AND applies to concrete Groups 1 to 5 inclusive. The Hy-Rib pressure diagram up to 3m in height of joint is assumed to be triangular – refer to Technical Information – Assumed Concrete Pressure Data. The permissible spans calculated from an uniformly applied concrete have been increased by a factor of 1.2 to allow for the triangular shape of the concrete pressure diagram. The maximum pressure only applies at the very bottom of the slab joint.

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