Report on site inspection and provide installation guidance on construction of rural road Sabang block, W. Medinipur district on

Transcription

1 Report on site inspection and provide installation guidance on construction of rural road Sabang block, W. Medinipur district on On approval of NRRDA numerous rural roads under PMGSY in WB are under construction with the use of JGT. NJB, as technology provider has been rendering all sorts of technical support and services to the user agencies and the engineers right from procurement to installation of JGT. As requested by Sri Dilip Mondal Executive of W. Medinipur district under WBSRDA and with the approval of the Secretary, NJB Sri P K Choudhury- Principal Technologist, National Jute Board visited the road site for inspection and to provide installation guidance on application of JGT on 19 th February,2018. A stretch of 1 km road starting from 0 point at Ruinan out of total length of 6.85 km rural road from Ruinan to Chakdamusen, district W. Medinipur was the proposed site as an R & D project. As decided by WBSRDA in consultation with NJB this I km stretch was proposed to reconstruct with the use of JGT at top surface as paving fabric, unlike on the sub-grade. During demonstration Ms. Jhumu Das - AE, Sri S D Choudhury - SAE along with the entire team members of the agency (M/S D B construction) including Sri Hrisikesh Basu as well as Sri Gobindo Hazra - Upo Pradhan were present at site. Everybody took keen interest on the work being taken up using innovative technology like JGT as it was reported that the condition of the said road was worst and performance could not improve even after doing frequent maintenance work. Further, it was reported by the AE that the sub-grade of the road was BC soil with CBR value of 2.5 to 3 %. It was advised by the undersigned that in future the dept. should first treat the BC soil with lime or any other material used in vogue and thereafter geotextile can be used, if required. 3,000 sq.m. woven JGT of 724 gsm, 25 kn/m tensile strength was procured by the agency from Premchand Jute Mills. The fabric was tested by IJIRA and the results were found in order. However, randomly chosen 5 number of rolls at site were visually inspected which were in order. Out of all the roads where demonstration has been given in the recent past this is the only road where application of JGT was done on the existing WBM surface as paving fabric. During demo. in a small scale the old PMC materials were removed and surface was cleaned and made almost dust free. Prime 0.8 kg / sq.m was spread on the surface and allowed to dry. Tack 0.22 kg / sq. m. was then spread over dried prime coat. JGT fabric was then laid on it with a sideway overlap of 10 cm and longitudinal overlap of about 20 cm and fixed on WBM, another layer of tack 0.22 kg / sq.m. was spread on JGT.Instead of applying 20 mm thick PMC above this layer, as desired by the dept. for demonstration purpose, stone dust was spread over tack coat and compacted with roller. After completion of 10 passes stone dust material was removed from places to critically examine if any puncture had occurred in the fabric due to roller pressure. Surprisingly, no puncture was observed in the fabric which established that this strong fabric designed and developed under CFC/IJSG/21 project could withstand the roller pressure even without use of PMC. The dept. was suggested to apply PMC on the 2 nd layer of tack coat immediately after its ( tack coat) application followed by roller compaction keeping the camber at 3.5% and finally spreading the stone dust on the top surface. The storing site of JGT was also inspected and found in most organized manner. Photographs of the site were taken during installation and the engineers were requested to take photographs of the subsequent stages including the road being opened to traffic. Overall progress of the road was found to be satisfactory.

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