FRESH AND STRENGTH PROPERTIES OF GREEN REACTIVE POWDER CONCRETE

Abstract

Reactive Powder Concrete (RPC) is a high strength, new generation concrete, formed from a special combination of constituent materials. The composition of reactive powder concrete includes cement (ordinary Portland cement), fine sand, silica fume, quartz powder, and high tensile steel fibers. Reactive powder concrete is grouped under ultra high performance concrete. Reactive Powder Concrete (RPC) is differs significantly from traditional concretes, in RPC no aggregate used and contains small steel Fibers that gives additional strength. A very dense matrix is achieved, and this compactness gives RPC ultra-high strength and durability properties. In the present study, a new type of green reactive powder concrete (GRPC) with ultra high compressive strength is prepared by totally replacing ultra fine quartz sand by the least costly and easily obtained natural river sand and Performance of green reactive powder concrete containing fly ash and GGBS as a replacement for cement at the percentage of 5% (M1), 10% (M2) and 15% (M3) by each is investigated. To compare the results of cement replaced mixture, specimen without cement replacement Standard GRPC mix (M) are also casted.

Performance of the various mixes is tested by the compressive strength, split tensile strength and flexure strength. A cube specimen of size 150mmX150mm X150mm, cylindrical specimen of size 100 mm dia X 200 high mm and beam specimen of size 150mm × 150 mm × 700mm were cast and demoulded after 24 hours then they allowed for normal water curing. The results show improvement in compressive strength in cement replaced mixes. The compressive strength varied in the range of 90 Mpa to 110 Mpa. The maximum compressive strength value that can be achieved in this study is 110 MPa for the GRPC with the Fly ash and GGBS as a replacement for cement at the percentage of 5% by each.