Effect of partial replacement of crushed aggregate with natural sand on mechanical and rheological properties of self-compacting concrete

This paper presents the results of an experimental study on the effect of crushed sand on the properties of fresh and hardened self-compacting concrete. Mixtures of self-compacting concrete have been produced with the replacement of ۰%, ۲۵%, ۵۰%, ۷۵% and ۱۰۰ % of natural sand with crushed sand (CSS). Same coarse aggregate with crushing percentage of ۷۵ has been used in all mixtures. Concrete grade of ۴۵۰ Kg/m۳ and water to cement ratio of ۰.۴ have been considered in the mixture designs. Workability properties of self-compacting concrete were investigated by empirical tests viz. slump flow test, T۵۰۰, V-funnel and L-box height. Rheological properties of concrete mixtures do not change remarkably by replacing ۲۵% and ۵۰ % of natural sand with CSS but if the mixture includes more than ۵۰ % of CSS, the rheological properties of self-compacting concrete will be influenced negatively and may endanger the applicability of the concrete. Strength tests included cube compressive strength test, flexural strength and Splitting Tensile Strength test. The hardened self-compacting concrete exhibits excellent short term strength with ۲۵% CSS content

کلیدواژه ها:

self-compacting concrete ، Natural River Sand ، Crushed Sand ، Iranian National Standard ، Strength