Cell filled Concrete Pavement – Components, Advantages, and Disadvantage
Cell-filled concrete pavement is the technology grown by IIT Kharagpur, which has demonstrate to be a very promising solution for overloaded vehicles, inadequate drainage facilities, and waterlogging problems. Cell-filled concrete pavement is made up of formwork of plastic cells over the compress subgrade/sub-base, fill with concrete or stones.
Components of Cell filled Concrete Pavement :
Plastic Cells – The plastic cells take action as both the shape and reinforcement for the pavement. The plastic cells are made from recover high-density polyethylene (HDPE) sheets of thickness 0.22 mm to about 0.25mm. These plastic cells can contribute as rolls of strips 50mm to 100mm wide, turn on upon the depth demand. The strips should be heat-weld or sew to form cells.
A pair of strips can be units at a 300 mm interlude. The third strip is welding to the first pair at 300 mm intervals so that the spasm lies at the center of the previous sew.
Subgrade – The subgrade forms the top 300 mm thick portion of the head. The head subgrade is compress into two layers, usually to a higher standard than the head. If the head soil is poor, the top 300mm of the subgrade may consist of good quality material from carrying off pits with CBR exceeding five. The subgrade shall be compressed to at least 100 percent of Maximum Dry Density per IS:2729. The extensive Black Cotton Soil (BCS) should be compress to a minimum of 95% of the maximum dry density with a moisture content 2% higher than the optimum.
The subgrade soil of existing roads is expect to have achieve the required stability due to traffic, and the CBR test should be done in undisturbed dry density and moisture content after four days of soaking. A dynamic cone perforation test is carry out to determine CBR values of subgrade quickly, and CBR values corresponding to immerse condition can be obtained from records of similar soils.
Other Cell filled Concrete :
Subbase – The subbase is made up of diatomite stone consolidation, water-bound sand, wet mix sand, crusher run sand, lime-fly ash-aggregate mixtures, lime stabilized soil, cement stabilized soil, and others with the proprietary mediator. A locally available collection such as murrum and gravel mix with lime fly ash may also be use. The locally available materials such as natural gravel/soil collection or blended with suitable collection fractions of stone, gravel, moorum, sand, or an amalgamation of these materials depending on the grading required.
If the number of commercial vehicles is more than fifty per day. 150mm of harden sub-base with a minimum 7-day strength of 1.5 MPa is recommend. The subbase should provide with stone/concrete block, or Brick on edge should be put on either side of the arterial projecting 50 to 100 mm above the subgrade/subbase for imprisonment and protection.
Concrete – Conventional pavement concrete with 28-day strength of 30 MPa. And with a flop of about 30 to 50mm can fill up the cell. Super-softener should be use to reduce water requirements for the desired flop. The Roller Compacted Concrete (RCC), as specified in clause 1502 of the statement for Rural Roads. It can also be use for filling up the plastic cells and compacted with a roller.
Advantages of Cell Filled Concrete Pavements :
- The cost of construction is much reduced when contrast to standard cement concrete pavement.
- Use of recycled plastic.
- If the personal block fails, it can easily return without much effort and with the least cost.
- As the growth or shrinking joints are not require, and hence preservation of joints is remove.
- The consumption of collection is almost reduce to 50% when contrast to normal CC pavements.
- Due to slow progress, the men and machinery’s organization is less than the normal construction.
- The construction of the cells is cumbersome.
- There are high chances of cells getting disturb while placing the concrete, and hence proper care is requires.