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Report on One Day Symposium on "Bridging the Gap: Theory and Practice in Pavement Engineering"

 The Transport Engineering Research Centre (TRC) was instituted at the Transportation Division, of CET in March 2012 with the intention of contributing its academic and research outputs to offer ‘better roads' for the public of Kerala. The prime objective of TRC is to transfer technological knowhow and research outputs to the stake holders in various sectors of road construction, maintenance, and road safety.

 

In order to ensure the dissemination and implementation of innovative research outputs in road sector, TRC organized a brain storming session, a One Day Symposium on "Bridging the Gap: Theory and Practice in Pavement Engineering "for practicing engineers, consultants and contractors. The symposium was meant to throw light on the recent innovations in the field through deliberations of and interaction with renowned experts in Pavement Engineering. The first TRC news letter depicting the research activities of TRC over the past three years was released by Prof. B. B. Pandey during this programme.

 

 

Releasing of TRC news letter by Prof. B. B. Pandey

 

The experts who led the symposium included Prof. B. B. Pandey, Advisor, Sponsored Research and Industrial Consultancy and former Professor and Head, Dept. of Civil Engineering, IIT, Kharagpur, Shri. Bongirwar, Former Principal Secretary, PWD, Maharashtra and Dr. A. Veeraragavan, Professor, I.I.T, Madras. The programme had an overwhelming response and a total of 90 participants including about 50 engineers from State Government departments/Consultancy Services and Academia, research scholars and post graduate students attended the programme. The topics of discussion included revisions included in the latest codes of practice for design of flexible and rigid pavements, construction of roads at affordable cost, innovative pavements and importance of maintaining quality control in construction of pavements. The need of adoption of innovative and sustainable materials like Recycled Asphalt Pavement materials, modified binders and adapting to new construction practices were emphasized in the programme. During the interactive session with the experts, the engineers shared various types of issues and challenges confronted by them in the field and the experts discussed the issues in detail and suggested possible solutions for them. The theme and conduct of the symposium was well appreciated by the participants.

 

The specific recommendations of the symposium are given below:

Sl. No.

Recommendations

1

Stabilization of subgrade soil using lime/ fly ash/cement/ rice husk ash with lime or a combination of any of these whichever is suitable for the site can be tried for improving the CBR value and thereby reducing the thickness of pavement.

2.

Provision of geo synthetic drainage layer, Geo Cell filled WMM, DBM grade II and a BC layer will reduce the thickness of pavement considerably.

 

3.

Use of marginal aggregates in base and subbase to be encouraged.

4.

For climatic condition of Kerala, use of VG 40 bitumen modified with polymer or natural rubber is desirable especially for high trafficked roads like National Highways.

5.

Top down cracking in bituminous pavements are to be addressed seriously, and the mixing, rolling and compaction temperatures for modified binders should be 15oC more than that for conventional binders

6.

Pavements with Recycled Asphalt Pavement (RAP) /RAP and fresh aggregate combination in base course is a desirable option for bituminous pavements instead of providing additional thickness as overlays.

7.

Cold recycling can be a sustainable practice suitable for Kerala, and use of RAP with bitumen emulsion/foamed bitumen is desirable.

8.

Providing bituminous pavement with cemented base, granular subbase with crack relief layer of aggregate above cemented layer is to adopted as it prevents crack propagation.

9.

Geocell filled with aggregates for base course in cement concrete pavements can be tried as they are found to have better service life due to the confinement provided by geocell.

10.

Semi self-compacted concrete roads are suitable for low volume roads.

11.

Use of 20 mm carpet without fines and cement grout as seal coat can be tried for low volume roads instead of 20 mm PMC plus seal coat.

12

Cell filled concrete pavement(flexible concrete) for village roads

13

Maintenance free Panel concrete for major highways( expressways, NH and SH), District roads and village roads (cost is same as that of bituminous roads)

14

Gap graded wearing course(GGWC) with rubberized bitumen (IRC:SP:107:2015) , Unlike BC and SDBC, with Bitumen, CRMB and PMB, GGWC can give long life even on a cracked bituminous surface

 

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