Evaluating the Properties of Demolished Aggregate Concrete with Non-destructive Assessment

Abstract

The enormous amount of construction and demolition waste and destructive testing generates environmental degradation day by day. On that state, the practice of demolished concrete aggregate (DCA) in concrete production and the use of non-destructive testing (NDT) unlocks a whole new range of possibilities for sustainable concrete production. This experimental investigation aims to quantify the fresh and hardened properties of demolished aggregate concrete (DAC) with the NDT assessment of concrete specimens. In this investigation, four concrete mixes were prepared that having 0, 15, 30, and 45% DCA replacement of normal coarse aggregate (NCA). By preparing the concrete mix, slump test and compaction factor tests were carried to evaluate the influence of DCA aggregate on fresh state properties. Besides, uniaxial compressive strength, splitting tensile strength, and digital rebound hammer tests were examined after 7 and 28 days of curing ages. However, the slump and compaction factor of the DAC decreases with the increment percentage replacement. Furthermore, the compressive strength and splitting tensile strength reduce around 9 and 5% on average, respectively, due to pores in the interfacial transition zone (ITZ). Moreover, the NDT assessment of the specimen helps to predict the compressive strength at the various stage of the specimen. This trend of the utilization of DCA and NDT assessment is the key toward the problem of a surplus of waste materials and enhancing the parallel option of final product quality assessment regularly.