Workability Retention and Strength Development of Self-Compacting Recycled Aggregate Concrete Using Ultrafine Recycled Powders and Silica Fume

Abstract

This paper presents the results on workability testing as well as strength testing of self-compacting concrete containing partial/full coarse recycled concrete aggregates and ternary blended cement using ultrafine recycled powder (RP) and silica fume (SF). In past decades, researchers have focused on the use of recycled aggregates (RA) in concrete as a replacement for natural aggregates (NA) in developing normal vibrated concrete (NVC). But the use of RA in self-compacting concrete (SCC) is still at the initial level. In this study, comparisons were made among different mixes containing SF, RP, and fly ash (FA), and various workability tests were performed at different time intervals from the start of mixing of the concrete. Similarly, compressive strength, split tensile strength, and flexural strength tests on 28-day water-cured hardened concrete mixes were carried out. The analysis is presented, and the results show that up to 10% RP can be used considering its effect on the workability of concrete.