Question about concreting
Question about concreting
(OP)
Hi Bridgemen
There is a steel composite bridge comprising 4 I girders and a concrete slab. The railway tracks possession time given to the erection of this bridge is short so I would like to cast the slabs over two pairs of girders and leaving the central bay/strip open. Once the two pairs of girders are in their final position, permanent formwork spans between the two interior girders and concrete will be poured on it.
My question is that if there is a construction joint running longitudinally along the bridge, is there any adverse effects on the strength of the composite section or on the serviceability (e.g. water leaking from the construction joints)? How to solve it ?
There is a steel composite bridge comprising 4 I girders and a concrete slab. The railway tracks possession time given to the erection of this bridge is short so I would like to cast the slabs over two pairs of girders and leaving the central bay/strip open. Once the two pairs of girders are in their final position, permanent formwork spans between the two interior girders and concrete will be poured on it.
My question is that if there is a construction joint running longitudinally along the bridge, is there any adverse effects on the strength of the composite section or on the serviceability (e.g. water leaking from the construction joints)? How to solve it ?





RE: Question about concreting
RE: Question about concreting
Where the slabs are joined, you should beef up the crack control reinforcement in the slab to be poured last, as it will be restrained by the first section.
As to waterproofing, concrete is not really a watertight material, so you can expect some leaking if no membrane is used on the top.
RE: Question about concreting