RCC Slab 1

Your pour is only 139 cubic metres in volume.&nbsp;&nbsp;Unless your site batcher is incredibly slow or you are placing concrete via a skip, then you should have few problems in completing this pour without a cold joint.<br><br>You can place the concrete either by direct tipping into a chute made from (say) a steel tube suspended from a crane for ease of handling, or you could use a concrete pump.<br><br>As for pouring procedure, start in one corner and keep two faces live with concrete as you move away from the corner.&nbsp;&nbsp;If you are still concerned about cold joints then I suggest you use temporary stop ends from materials such as Expamet.&nbsp;&nbsp;These are sheets of woven stainless or galvanised steel through which your rebar can be punched.&nbsp;&nbsp;Once the concrete reache the expamet it tries to pass through but can't.&nbsp;&nbsp;This leaves a very rough key for the next stage of your pour to bond onto with no scabbling or pre-treatment required.&nbsp;&nbsp;Traditional timber temporary stop ends could be used but need a good concrete gang working with them.<br><br>Regarding admixtures, you need a retarder to extend the fluid life of the concrete in order to prevent cold joints.&nbsp;&nbsp;This will inhibit the rate of strength gain initially but should not affect the design strength of the concrete.<br><br>Regards <p>Andy Machon<br><a href=mailto:Andy@machona.freeserve.co.uk>Andy@machona.freeserve.co.uk</a><br><a href= > </a><br>