Concrete Curb can be done by using precast method, but sometimes contractors might choose to use cast-in-situ method too which is casting the concrete curb at construction site. By using cast-in-situ method, it doesn’t require any concrete curbing machine. With that said, the cost can be save from here without using any machinery.
In constructing a longer straight concrete curb at the construction site, it might requires more workers to complete the job on time. With that said, the cost will be increasing on this part. Other than this, contractor must ensures that the workers can complete the casting and make it in shape because the concrete will be fixed in certain period.
How To Build Concrete Curb By Hand
1) Build up the mold or formwork which is in concrete curb shape.
2) Mixing the concrete in correct mixture.
3) Pouring the concrete into the mold or formwork just now.
4) A few of workers are starting to smoothen the concrete curb with a timber plank. Workers must compact the concrete curb so that it won’t be collapsed or cracked easily. Workers must complete this task as soon as possible before the concrete fixed in shape.
5) After the workers have done the concrete works, they might need to take off the formwork or mold after the concrete is fixed in shape. Job is completed and workers have to continue other works like drainage system.
Precast Concrete Drop Kerb is one type of concrete curb that used on the roadside. Other than constructed on the roadside, it’s used on the pedestrian crossing too. The precast concrete drop kerb is constructed as a slightly slanting slope. When walkway passengers are walking on the walkway, they cross the road and this precast concrete drop kerb makes them easy to cross the road.
How To Construct Precast Concrete Drop Kerb
That’s not difficult to construct these kerb, since the drop kerb is a precast product and it saves a lot of time instead of casting it on the site. Most of the contractors use precast product instead of casting it on the site, because it’s not only saving cost and also times.
1) Earthwork
You have to make sure that the condition of soil is strong enough to support the works on the ground. Otherwise, you can do a soil investigation to test the condition of soil. After that, fill about 200mm thick sub-base.
2) Concrete Base
After the earthwork is done, construct a concrete base to support the drop kerb. Mass concrete can be used to construct the concrete base since the load of the drop kerb is small. The concrete base is a cast-in-situ concrete. The insitu concrete surfaces below ground level shall be coated with road oil to avoid the water flow into the concrete.
3) Drop Kerb
Lay the drop kerb on the concrete base. The drop kerb base have to haunch with Bituminous Double Coat Paint before lay on the concrete base.
4) Pavement & Road Work
After the drop kerb is done, other works like pavement works and road works to be constructed. Pavement works consist of lower roadbase, upper roadbase and wearing course. While road works consist of 200 x 100 x 60mm grey paving blocks in Herringbone Pattern.
