Estimating the Deterioration due to Chemical Attack in Repurposed Aggregate Concrete Using Image Based Techniques

Abstract

The increased construction activities necessitate use of alternate material resources as recycled aggregates in construction. The decreased quality of concrete during the recycling process can be modified by several methods of which, strengthening the aggregate skeleton in the volume of concrete is an ideal option. In the present work, Compressible Packing Model (CPM) of particle packing methodologies is adopted for aggregate gradation and design of concrete mixes. Hardened and durability properties of a 30 MPa concrete designed using CPM method is being investigated. The deterioration in concrete is analysed using Image analysis. The Hue, Saturation and Intensity are the parameters picked from the surface images of concrete cubes exposed to four chemical species viz., HCl, H2SO4, NaCl and MgSO4 for 28 days. CPM method improves the properties of multi recycled concrete with increased packing density of recycled aggregate. The image-based deterioration studies provided a new insight into estimating the durability performance of concrete subjected to attack of various chemical species.