Influence of Recycled Coarse Aggregates in the Application of Prestressed Concrete Members-A Review

Abstract

Abstract Currently the use of Pre-stressed Concrete (PSC) has increased globally because of its effectiveness in increasing the utilization area and strength of structural members than with the usage of conventional Reinforced concrete. However due to the increase in the cost of construction, sustainable methods such as the usage of Recycled Coarse Aggregate (RCA) in place of normal aggregate have to be practiced. In this context, a review is made to know the feasibility, advantages, and disadvantages of using RCA for PSC. The requirement of Physical-Mechanical properties of concrete for PSC is compared with the properties of RCA Concrete. Serviceability and durability requirements (high compressive strength, high bond strength, low creep, and shrinkage) of Pre-stressed Concrete by using RCA and rate of change of the strength of PSC with partial replacement of coarse aggregate with RCA after 7 days is studied. It is concluded that with an increase in percentage in replacement with RCA there is a decrease in compressive strength and increase in creep and shrinkage. It is also concluded that the bond strength between reinforcement and matrix wholly depends on the compressive strength of concrete. It is suggested that the modified EMV (Equivalent mortar volume) for the mix design of concrete was found to be an increased performance than the conventional method. It is also concluded that the RCA from old precast members and admixtures such as fly ash, slag, and silica fume decrease the shrinkage and creep strain. Ultimately RCA from the existing PSC members decreases the losses in the prestress members, for effective utilization of prestress in the concrete RCA replacement up to 30% found to perform well.