Construction of fullscale field test sections for 1 PET Geogridreinforced base subbase layers 2 2D/3D drainagegeocomposites embedded GSB layers 3 Asphalt interlayer grids and 4 Flyash geopolymer stabilized marginalaggregate bases at IIT Hyderabad

Clearing and grubbing road land including uprooting rank vegetation, grass, bushes, shrubs, saplings and trees girth up to 150 mm, removal of stumps of trees cut earlier and disposal of unserviceable materials and stacking of serviceable material to be used or auctioned.

By Mechanical Transport including loading,unloading and stacking

Earth - 3km

Embankment and subgrade construction: Preparation and consolidation of subgrade with power road roller of 8 to 12 tonne capacity after material placement, compacting (at maximum dry density meeting 10% CBR condition) and dressing to camber of 2.5%. In case if the material obtained from borrow pits, including compensation of earth with all lead and lift transporting to site, spreading to required slope and compaction. Subgrade of minimum 500 mm thickness at the top of the embankment. Note: Verify compaction density to determine whether the prepared subgrade is meeting CBR 10% condition through field testings.

Installation of Earth pressure cells, moisture sensors and inclinometer casings at appropirate locations as mentioned in the drawing. A wait period of 6 hours is required after the sensor installation before commencing with the next layer preparation (A detailed installation procedure is attached in Annexure A). Transportation of Geosynthetics material from the PG shed lab / Civil Engineering Department, IITH (within the Institute) to the construction site (TRIHUB, near TIHAN, IITH). Laying of Geosynthetics: (Incase of Drainage Geocomposites) Laying of drainage geocomposites made by high-density polyethene geonets (three variants) embedded with geotextiles at the top of the compacted subgrade. Geomposites are of two lengths 2 m and 4 m. The 4 m length geocomposies shall be laid as such, there is no requirement of overlap. However, a 150 mm overlap is required for drainage geocomposites of 2 m length. (Note: The section width is 3.5 m). A simpler installation procedure with a sketch is provided in the remarks section. Laying of Geosynthetics: (Incase of Geogrids) Laying of PP/PET Geogrids (as per the sectional drawings) at the top of the compacted subgrade. Geogrids are of 4 m or 5 m in length (Note: The section width is 3.5 m). Henceforth, there is no requirement of overlay. The geogrids shall be rolled as such.

Construction of granular subbase by providing close graded Material conforming to MoRTH 2013 specifications, mixing in a mechanical mix plant at OMC, carriage of mixed material by tippers to work site, for all leads & lifts, spreading in uniform layers of specified thickness with motor grader on prepared subgrade surface/geosynthetics laid and compacting with vibratory power roller to achieve the desired density (as per clause 401 of MoRTH specifications) and directions of Engineer-in-Charge. With material conforming to Grade-II (size range 75 mm to 0.075 mm) of Table 400-1 of MoRTH 2013 (5th Revision). A camber of 2.5% shall be maintained throughout.

Supply and installation of half-cut PVC pipes are required just beneath the drainage geocomposites or at the top of the subgrade, at the end of 10 sections (sections where 9 drainage geocomposites and 1 control section is prepared). And placing an 80 litre PVC or metal drum at the end of each section where drainage geocomposite is placed and 1 at the control section. Total number of sections= 10 (9 sections with drainage geocomposites + 1 unreinforced or control section).

Providing, laying, and compacting a Fly Ash–Geopolymer Stabilised Base (GBS) layer over the prepared sub-base by on-site mixing, spreading, and compaction using approved materials and procedures. The stabilized mix shall be prepared using fly ash (Class F) and aggregates, such as shale and construction and demolition waste, which will be provided by us. A liquid alkaline activator solution (a blend of sodium hydroxide and sodium silicate) will serve as the binding medium, prepared and supplied by us. The dry constituents shall be mixed, and the geopolymer activator solution shall be added to the uniform dry mix thoroughly using a concrete mixer until a consistent mix is obtained. The mixture shall then be spread in uniform layers and compacted using a vibratory roller to achieve the specified density and surface finish. Curing shall be performed using the ponding method for a minimum of 7 days to enable geopolymerization. The thickness of the layer shall conform to the approved design (typically 150 mm thick ).

Providing and laying a Crack Relief Layer (CRL) consisting of compacting stone aggregates of specific sizes to compacted thicknesses of Wet Mix Macadam (WMM) of 100 mm thickness over the geopolymer base layer. The material shall be clean, non-plastic, and free from deleterious matter. The CRL acts as a stress-absorbing interlayer between the rigid geopolymer base and flexible bituminous surfacing. It shall be spread uniformly and compacted lightly using a roller to achieve a firm but unbound surface.