Title : GREEN PAVEMENT WITH HIGH VOLUME FLY ASH CONCRETE
Authors : Anil Banchhor Chief Executive (Concrete Business), ACC Limited
Publication : 23 - 26 October 2013
Volume :
Pages :
Price : 250
Abstract : This paper discusses the suitability of HVFAC in road construction on the basis of a demonstration project wherein a 30m-long road was constructed with an embedment of 63 nos vibrating wire type strain gauges to measure the temperature and load stresses under actual load conditions. Panels of different lengths, thickness, with/without polythene sheet between DLC & PQC, etc., were cast for evaluation. The benefits of using fly ash in concrete pavements have been evaluated in the above demonstration project in terms of fresh concrete properties and hardened concrete properties with respect to strength and durability. With the improved properties of HVFAC, the initial cost also comes down because of reduced pavement thickness and the cost difference with the bitumen road also getting reduced coupled with the improved life cycle cost. The design of concrete pavement in India is being done as per the standard code of IRC-58–2002, wherein load stresses as well as temperature stresses are predominant and have a cumulative effect due to extreme heat in the summer. The design is based on the empirical formulae of Bradbury’s coefficient and Westergaard’s equations. With this background, an experimental study project was taken up at Noida to study the effect of temperature and load stresses in the HVFA concrete panels and to compare the stresses with that of control concrete made with similar materials and workmanship at the same locations by measuring the actual stresses by inserting the strain gauges (vibrating wire type) at various depths and locations of concrete pavement. The author concludes that the use of PPC would also solve the problem of non-availability of facilities of testing of fly ash at many construction sites, where the processed fly ash as per IS 3812-2003 is not available but the user wants to derive the benefits of good quality processed fly ash present in the cement.