CEMENT CONCRETE KERB AND KERB WITH CHANNEL
This work shall consist of constructing cement concrete kerbs and kerbs with channel in the central median and/or along the footpaths or separators in conformity with the lines, levels and dimensions as specified in the drawings or as directed by the Engineer.
To know more about PQC(Pavement Quality Concrete) ,kindly visit on below link 🔗
Kerbs and kerb with channel shall be provided in cement concrete of Grade M 20.
3 -Type of Construction
These shall be cast-in-situ construction with suitable kerb casting machine in all situations except at locations where continuous casting with equipment is not practicable. In those locations precast concrete blocks shall be used.
A continuous kerb casting equipment of adequate capacity and controls, capable of laying the kerbs in required cross-sections and producing a well-compacted mass of concrete free of voids and honeycombs, shall be used.
5 -Construction Operations
(I) Kerb shall be laid on firm foundation of minimum 150 mm thickness of cement concrete of M 15 grade cast in-situ or on extended width of pavement. The foundation shall have a projection of 50 mm beyond the kerb stone. Before laying the foundation of lean concrete, the base shall be leveled and slightly watered to make it damp.
(II) In the median portions in the straight reaches, the kerb shall be cast n continuous lengths. In the portions where footpath is provided and/or the slope of the :carriageway is towards median (as in case of superelevated portion), there shall be sufficient gap/recess left in the kerb to facilitate drainage openings.
(III) After laying the kerbs and just prior to hardening of the concrete, saw grooves shall be provided at 5 m intervals up to finished road level or as specified by the Engineer.
(IV) Kerbs on the drainage ends such as along the footpath or the median in superelevated portions, shall be cast with monolithic concrete channels as indicated drawings. The slope of the channel towards drainage pipes shall be ensured for efficie: drainage of the road surface.
(V) Vertical and horizontal tolerances with respect to true line and level shall 6 mm.
6- Measurements for Payment
Cement concrete kerb/kerb with channel including foundation shall be measured in lines metre for the complete item of work.
7 - Rate
The Contract unit rates for cement concrete kerb/kerb with channel including foundation for kerb shall be payment in full compensation for furnishing all materials, labour, tools, equipmer for construction and other incidental cost necessary to complete the work.