COMPARISION OF IS CODE METHOD AND NAN-SU METHOD OF MIX DESIGN FOR SCC

Abstract

Self Compacting Concrete is a highly fluid concrete mixture with no segregation and can compact under its
own weight. Looking at the potential of cementitious constituents in fly ash, it can be used as partial replacement of
cement in SCC to achieve self compaction. Reused Aggregate is called as Recycled Coarse Aggregate (RCA) which is
mainly obtained from demolished concrete structures. RCA in Unprocessed and Processed state (500R & 1000R) used
as a partial replacement of Natural Coarse Aggregate (NCA) with varying percentages (0%, 25%, 50%, 75% and
100%). In this experimental investigation, the standard grade of SCC mixes were designed using IS code method and
Nan-Su method. The fresh properties of SCC has been determined using Slump cone, V-Box, L-Box, were compared
for the assessment of the Self-Compactability of concrete for both methods. A number of trial mixes were made using
IS code method and Nan-su method: by changing sizes of coarse aggregate; varying percentages of Flyash; varying
the dosages of Super Plasticizer(SP). It was found that the final mix proportion using Nan-su method shows satisfying
results in terms of fresh properties of SCC compared to IS code method i.e., at 50% partial replacement of NCA with
processed(500R) RCA.