The Public Works Department (PWD) has asked its field engineers to use modern technologies including shredded plastics, natural rubber modified bitumen (NRMB), geotextiles and soil stabilisation measures in all road works.
The directive comes in the wake of a finding that the PWD has not been making ample progress in the use of modern technologies in the construction of road corridors despite the emphasis given to it by the government in the PWD policy.
The Chief Engineer, in his recent directive on the preparation of estimates and execution for works under the PWD, said provision for using shredded plastic was not included in the estimates.
While preparing the estimates and according technical sanction (TS) for works, the Superintending Engineers and Executive Engineers of the PWD Roads Division were asked to ensure that at least 50% provision is given for using bituminous concrete (BC) or asphaltic concrete with shredded plastic and the remaining with NRMB.
Henceforth, soil stabilisation including recycling technology should be adopted on suitable roads having a minimum length of 5 km. Coir geotextiles or synthetic geotextiles must be used based on proper design, wherever necessary. Polymer modified bitumen will have to be used for BC layer on selected roads having high intensity of traffic.
Field officials have been asked to ensure that the provisions that are approved in TS estimates are strictly implemented on sites during execution. Official sources told The Hindu that the engineers had been asked to ensure that modern technologies were used with immediate effect.
Cold in-place recycling (CIR) of bituminous pavement, an environment-friendly green technology for laying roads, is also being adopted by the National Highway wing of the PWD. The NH 66 corridor between Pathirappally and Purakkad in Alappuzha has used the CIR for the first time in the State. The CIR is a rehabilitation technique of pavement in which the existing materials are reused. The PWD has already decided to deploy modern technology for the stabilisation of slopes at the sites of 2,442 landslips triggered by the recent rain and floods across the State.