oncrete blocks present in the edge caused by trucks traveling close to the edge.
0.85m width of the hard shoulder must be maintained on either side of the pavement.
Across the compacted subbase there must be Formwork of plastic cells which are then put under tension with iron spikes so that cells are close to squares in plan.
To prevent the cells from collapsing while filling the cells with concrete nylon threads must be passed at 10 mm below the top of the cells.
In case of any opening of stitch of the cells during tensioning it must be made sure that it is stapled near the top, middle, and bottom.
The concrete should be filled 20mm higher than the cell depth where the depth of cells is 120 mm.
Once the cells are filled with concrete the iron spikes shall be removed. In case of RCC, two passes of the roller in static mode followed by two passes in vibratory and another pass in static mode must be sufficient for compaction and a good finish.
The texture of aggregates and moisture content determines the number of passes in static and dynamic modes.
To compact the conventional concrete having a slump of about 30 to 40 mm conventional vibrator can be used.
For the determination of trial run the number of rollers passes, the amplitude of vibrations, the depth of loose concrete in cells, and the amount of water to be added must be taken to account.
To prevent drying in the hot weather the concrete's surface should be covered with wet jute mats or paddy straw.
Just like the camber of 3 to 3.5 % is provided for rural roads, wet jute or coir mats and wet paddy straw shouldbe provided for better water curing option and only light traffic must be allowed to move on the surface. In the water ponding method, the water accumulates on the lower side of the mud enclosurewhereas the higher part becomes dry soon.
Advantages of Cell Filled Concrete Pavements
- Recycled plastic can be used.
- Since there is no requirement of the expansion or contraction joints, therefore, the maintenance of joints is eliminated.
- Compared to conventional cement concrete pavement the cost of construction is considerably reduced.
- There is a reduction in the consumption of aggregates to 50% when compared to normal CC pavements.
- In case of individual block failure, it can be easily replaced without putting in much effort and maintaining a low cost.
Disadvantages of Cell Filled Concrete Pavements
- The preparation process of the cells is tiring.
- It requires proper care as there are high chances of cells getting disturbed while trying to place the concrete.
- As the process is slow, the men and machinery's efficiency is less than the normal construction.