Reuse of improved recycled concrete aggregates (RCA) for sustainable and environmental-friendly construction materials

Ahmad Alyaseen,Hussain Alahmad,Ravindra Solanki,Siddharth Shah,Bhavik Daxini,Yogesh K Alwani

doi:10.1088/1757-899x/1145/1/012024

Abstract

Recycled aggregates have an essential role in constructing construction activities today to save natural aggregates because of industrial development. The research aims to assess the suitability of recycled aggregates for the construction of new roads, which will help achieve road construction efficiency and help prevent environmental deterioration in the extraction and reducing pollution. In contrast with natural aggregates, recycled aggregates are of lower quality, mainly due to the cement mortar’s brittle nature attached to them. The point of the study is to increase the performance of RCAs in an environmentally friendly managing RCAs. In this process, RCAs are first soaked in acetic acid solution, in which acetic acid reacts with cement attached to the surface of the RCA. This reaction weakens the attached mortar and allows separating from the RCAs by using mechanical friction later. Treated RCAs have lower water absorption and more insufficient cement mortar adhesion. These RCAs used as aggregates in new the concrete increased the compressive strength, the tensile strength, and the concrete’s flexural strength by 26%, 11%, and 26% at 28 days, respectively. It is clean, safe, efficient, and a new method to be applied, so no harmful products are used, and no dangerous substances are incorporated into the RCAs that are being treated. The waste treatment solution was used as a supplementary admixture construction, increasing the concrete’s strength, and decreasing its environmental effects.

Highlights

The concrete industry consumes massive quantities of natural resources, which can be turning into insufficient to meet the growing demands
It can be concluded that there was no adverse effect on the density and water absorption capacity of hardened concrete following Acetic Acid therapy u p to 50% substitution
The new concrete properties that change with Recycled Concrete Aggregate (RCA) use are less workable than NC because of the increased Recycled aggregates (RA) water absorption

Summary

Introduction

The concrete industry consumes massive quantities of natural resources, which can be turning into insufficient to meet the growing demands. Removing, replacing, and reconstructing concrete buildings, concrete recycling, and reuse are becoming prevalent ways of utilizing the debris. Crushed concrete, recycled aggregates are commonly used in low building schemes such as solid pavements, etc. Concrete pavement is typically less preferred in developed Asian countries because of its high initial building cost, which is around 15 percent more than bituminous paving. The current recycling technology is readily available via mechanical crushing and is inexpensive[15] This can be achieved in both developing and emerging nations. Even with the current technologies, substantial improvements in recovery levels may be accomplished in individual nations, with greater public tolerance of recycled crushed concrete aggregates and elimination of myths or misunderstanding regarding their use possibilities[17][18]19]

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Results

Conclusion