--- title: "NHAI Project in Raebareli, UP: A Case Study on the Use of Ocean Geogrid-20Kn PP" date: 2024-05-25 author: "Pawan Khatri" url: https://oceangeosynthetics.com/nhai-project-in-up-case-study-on-use-of-ocean-geogrid/ --- May 25, 2024 | [Case Studies](https://oceangeosynthetics.com/category/case-studies/) # NHAI Project in Raebareli, UP: A Case Study on the Use of Ocean Geogrid-20Kn PP For a National Highways Authority of India (NHAI) road project in Raebareli, Uttar Pradesh, 37,500 square meters of Ocean Geogrid-20Kn PP were used to reinforce the pavement over weak, unstable soil. This case study covers the ground conditions, why a polypropylene geogrid was chosen, and how it was installed. ## The challenge: unstable soil Raebareli lies on the Gangetic plain, and the soil along the alignment is predominantly silty and clayey. Soils like this are moisture-sensitive: they lose strength when wet, and they move as they wet and dry, which leads to subsidence and low load-bearing capacity under a road. Lime or cement treatment of the subgrade was considered and judged unsuitable for this project. ## Why Ocean Geogrid-20Kn PP Ocean Geogrid-20Kn PP is a [polypropylene geogrid](https://oceangeosynthetics.com/products/geogrid-manufacturers/polypropylene-geogrid/). Placed beneath the granular layers, the grid’s apertures lock the aggregate in place, so it cannot spread sideways under wheel loads. The confined layer spreads load over a wider area of weak subgrade, which reduces rutting and settlement. The reasons it was chosen: - **Tensile strength:** the [geogrid](https://oceangeosynthetics.com/products/geogrid-manufacturers/) has a tensile strength of 20 kN/m (tested to methods such as ASTM D6637 or ISO 10319), enough to reinforce the base and reduce the risk of subsidence. - **Durability:** polypropylene resists chemical and biological degradation in soil, so the buried grid keeps working long term. - **Ease of installation:** the rolls are light and easy to handle, which cuts installation time and labour and helps the project keep to its programme. - **Cost:** a more stable pavement needs less frequent maintenance, and reinforcement can reduce the granular thickness needed over weak soil. ## Implementation 1. **Site preparation:** the existing soil was excavated and levelled to form a stable base for the geogrid. 2. **Geogrid installation:** rolls of Ocean Geogrid-20Kn PP were laid across the prepared formation and anchored so they would not shift during later construction. Adjacent rolls are normally overlapped, with wider overlaps on softer ground. 3. **Filling and compaction:** aggregate was spread over the geogrid and compacted in layers until the design thickness was reached. Good practice is to tip and spread aggregate from the already-covered area, so construction traffic never runs directly on the bare grid. 4. **Surface layers:** the upper pavement layers and final surfacing were then built on the reinforced base. IRC SP:59, the Indian Roads Congress guidelines for geosynthetics in road pavements, covers the design and installation of geogrid-reinforced bases of this kind. ## The outcome The Raebareli road built with Ocean Geogrid-20Kn PP met its performance requirements. Reinforcing the base reduces the risk of subsidence on this soil and is expected to extend the road’s service life. ## Other applications The same geogrid can reinforce the embankments of reservoirs and other [water storage](https://oceangeosynthetics.com/suitable_sectors/water/) facilities, as well as working platforms, hardstands and unpaved roads over soft ground. Ocean Non Wovens manufactures and supplies geogrids and other geosynthetics for roads and infrastructure. See more [case studies](https://oceangeosynthetics.com/case-studies/) or [contact us](https://oceangeosynthetics.com/contact/) to discuss your project. 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