A Study on Performance of Fly ash and Recycle Concrete Aggregate in DLC for Rigid Pavement

Abstract

Rigid pavements are constructed of Portland cement concrete slabs resting on a prepared sub base of granular material or directly on a granular sub grade. Load is transmitted through the slabs to the underlying sub grade by flexure of the slabs. There are Sub grade, sub base and base layer for Rigid pavement. Sub base is also known as the DLC layer. Dry Lean Concrete is a mixture in which the amount of cement is less than the amount of liquid that is present in the layers. It is smooth concrete with a large proportion of aggregate in relation to cement than conventional concrete and is generally used as a base/sub-base for hard paving. Although the actual thickness will be governed by the design considerations, a thickness of minimum 150 mm is recommended for all major projects of State Highways and National Highways. When DLC is adopted as sub base in case of roads other than the above road sits thickness of 100 mm is recommended. Increase the strength of DRY LEAN CONCRETE by using FA & RCA. To Compare to Economic analysis for DLC & DLC added materials of FA and RCA Study of bearing pressure revealed a good resistance of the granular mixture (recycled concrete aggregate + cement). It has been observed that by curing of blended RCA, it has gained very high strength which shows that with the addition of cement to blend of sand and RCA, it becomes semi- rigid pavement i.e the pavement changes its nature from flexible to semi-rigid pavement. In present study aims preparing concrete by adding materials of Ordinary Portland Cement (OPC) with fly ash 15% and RCA in various proportion like- 10%, 20%, 30%. By mass of quantity. Maximum compressive strength for DLC + FA (15%) and RCA 20%is 9.48 MPA. The study discloses that high volume of Fly Ash in concrete reduces the water demand and improves. Experiments such as compressive test. Economic analysis compare to DLC and DLC added by Fly ash and RCA.