Performance Enhancement of Concrete Containing Fine Recycled Aggregate

Introduction

 

•  To study the effect of water cement ratio on the strength of recycled fine aggregate concrete.

•  To study the effect of nano silica as strength enhancer in concrete containing recycled fine aggregate concrete.

 

Experiment Parameters

 

•  To study the compressive, flexural and tensile strength of normal strength concrete with recycled fine aggregate at 7 and 28 days.

•  The water cement ratio is varied between 0.4 to 0.45, keeping a cement content of 400 kg/m³.

•  The dose of nano silica for varies mixes are kept at 1 % of cement content.

 

Failed specimens after compression test	Apparatus for Chloride ingress test
Failed specimens after flexure test	Specimens under Chloride Ingress test

 

Achievements

 

In this study, the effect of partial and full replacement of sand with recycled fine aggregate (Proportions from 0-100 %). By using nano silica as strength enhancer in concrete containing recycled fine aggregate. The dose of nano silica for various mixes is kept at 1% of cement content.

 

The following conclusions are made from the experimental study;

 

•  The Hardened properties of concrete made with 20% and 30% of recycled fine aggregate are similar to those of concrete made with 100% of natural fine aggregate.

•  The Hardened properties of concrete decreases gradually with respect to the increase of the percentage of recycled aggregates.

•  When 1 % Nano - silica is used strength enhancement takes place so that RFA can be replaced upto 100% without affecting the hardened properties.

•  By varying the w/c ratio in concrete, the hardened properties of concrete is higher in w/c ratio 0.4 compared to the w/c ratio 0.45.

•  The SEM image shows very dense and improved Inter-facial Transition Zone.

 

 

• For further information please contact

 

Pondicherry Engineering College
Pillaichavady, Puducherry 605 014
Email : revathi@pec.edu