Why in News?
CSIR (Council of Scientific and Industrial Research) - CRRI (Central Road Research Institute) and BPCL (Bharat Petroleum Corporation Limited) were recognized by the India Book of Records and Asia Book of Records for constructing the first roadblock section using geocells made entirely from end-of-life plastic waste.
Composition and Structure
- Material: Primarily made from high-strength polymers like High-Density Polyethylene (HDPE), polypropylene, or newer sustainable materials like jute and recycled plastic.
- Design: A network of interconnected cells that are collapsed for transport and expanded on-site into a honeycomb-like mattress.
- Infill: These cells are typically filled with local soil, sand, aggregate, or even concrete, depending on the application.
Core Functions & Mechanism
- Confinement Effect: By encapsulating the infill material, geocells prevent the lateral movement of soil particles, creating a rigid "slab" effect that distributes heavy loads over a wider area.
- Stress Reduction: They can reduce vertical stresses transferred to the subgrade by up to 30%, allowing for thinner road base requirements.
- Erosion Control: On slopes, the cells hold soil and vegetation in place, preventing washouts from rainwater or surface runoff.
Key Applications
- Road Construction: Used for reinforcing road bases, particularly in marshy or soft-soil areas, reducing the need for expensive aggregate layers.
- Railways: Stabilizes the ballast and sub-ballast layers to prevent track deformation and improve drainage.
- Slope Protection: Stabilizes steep embankments, retaining walls, and channel linings.
- Infrastructure: Employed in airport runways, industrial yards, and container terminals to handle extreme static and dynamic loads.
Major Advantages
- Cost-Efficient: Reduces construction material needs (up to 50% less aggregate) and lowers long-term maintenance costs.
- Sustainability: Facilitates the use of local, low-quality infill materials and reduces the carbon footprint by minimizing transport needs.
- Climate Resilience: Helps infrastructure withstand extreme weather conditions, such as heavy monsoons, which typically cause potholes and road settling.
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