PARAMETRIC STUDY OF DRY LEAN CONCRETE (DLC) AS A BASE COURSE MATERIAL

Abstract

Over the past two decades a number of rational design methods have been developed for highway airfield and heavy duty pavements. The rational design methods require the fundamental properties of various materials, like, strength, modulus of elasticity (E), poission's ratio (μ) & fatigue characteristics. There are several methods available for estimation of these properties under various conditions for different materials and several studies have been carried out for these parameters on different types of base course. The present study deals with determination of these parameters of Dry Lean Concrete (DLC) as a base course material. Recently IRC:SP:49-1998 has specified the use of Dry Lean Concrete (DLC) as a base course material in concrete pavements. DLC has certain advantages, like availability of a firm-structural support for construction equipments, prevention of pumping, enhancing the pavement performance under frost action, high resistance to deformation, control of volume changes in expansive soils. Due to these characteristics, DLC is most suitable material as base course for modern traffic and heavy load conditions. But no laboratory study is available in literature on determination of fundamental properties of DLC. In the present study, destructive and non-destructive tests have been conducted in laboratory to find the parameters of DLC like, strength, modulus of elasticity (E), poission's ratio (t) fatigue and load carrying capacity. An attempt has also been made to study these parameter when 20%, 30% and 40% cement in DLC is replaced by flyash.