Recycled Aggregate Concrete: A Critical Review of its Properties, Limitations and Applications

Abstract

Around 1.3 billion tons of solid waste is generated worldwide every year, of which building materials make up roughly 50% of all materials consumed by human activities and similarly contribute to about 50% of the solid waste generated. The waste that is generated during a building construction, maintenance, repair and disposal phase is called Construction and Demolition (C&D) Waste. The management of C&D waste is a big challenge faced by the world. However, rather than being treated as waste, using construction waste as an aggregate for developing new concrete appears to be technically viable. Therefore, the idea of recycled aggregate has been developed and adopted which is beneficial to the environment. The use of RCA in concrete also reduces the demand of virgin aggregates. This paper reports the use of RCA in concrete, its basic properties & also compare the properties of RCA with natural aggregates. Also discuss the production, properties and application of RCA, the barriers to its uptake. The future recommendations are also discussed in addition.

Introduction

The text discusses Recycled Aggregate Concrete (RAC) as a sustainable alternative to conventional concrete. The increasing demand for natural aggregates and the growing amount of construction and demolition waste create environmental problems, including landfill accumulation, soil degradation, and depletion of natural resources. Recycling demolished concrete into aggregates can help address these issues.

Recycled Aggregate Concrete is produced by partially or completely replacing natural aggregates with recycled aggregates obtained from demolished concrete, pavements, buildings, bridges, and brick masonry. The waste materials are crushed, screened, and cleaned to remove contaminants such as plastic, wood, glass, and metal.

The main objectives of the study are to examine the sources and production of recycled aggregates, investigate their properties, compare recycled aggregate concrete with natural aggregate concrete, evaluate its environmental and economic benefits, and identify its applications and limitations.

Properties of Recycled Aggregate

• Particle Size Distribution: Recycled coarse aggregates can generally meet the required size standards after crushing and screening. Fine recycled aggregates may require additional processing or adjustments.

• Water Absorption: Recycled aggregates absorb more water than natural aggregates because they contain old cement mortar, which is porous.

• Bulk Density: Recycled aggregates generally have lower bulk density than natural aggregates due to the presence of porous mortar. Their bulk density is reported to be approximately 10% lower on average.

• Impact and Crushing Values: These properties are important for evaluating aggregate strength and resistance to mechanical forces.

The performance of recycled aggregate concrete depends on the quality of the original concrete, the amount of attached cement mortar, and the recycling process. Increasing the proportion of recycled aggregates may reduce compressive and flexural strength. However, supplementary ceme

Conclusion

From the studies of different properties of recycled aggregate concrete, we will come up with following conclusions: 1) RAC is useful as a substitute to natural aggregates to produce concrete with desirable properties under specifications. The only problem with the RAC is its inconsistent quality when it is obtained from old mortar. 2) The physical properties of RAC significantly influence the fresh and hardened state properties of concrete. The aggregate abrasion, crushing and impact value of RAC affects the compressive strength, stiffness, tensile strength values of concrete. 3) However, the effects can be reduced by using accurate characterization of RAC, moisture control, pre- treatment, proper mixing procedures etc. 4) The use of 100% RAC is possible to produce concrete with acceptable quality. The concrete made with RAC has 80 – 90% of the compressive strength compared to concrete made with natural aggregates. The reduction in the strength is caused by the adverse physical properties of RAC. 5) The use of fine RAC in production of new concrete is examined carefully, as the fine RA will reduce the strength of concrete. In general, it was found to be 10% reduction in strength of concrete made from RAC as compared to natural aggregates. 6) The performance of RAC can be enhanced by adjusting water-cement ratio, use of pozzolanic materials and admixtures. 7) RAC can be used as high-quality concrete such as high strength, high performance and self- compacting concrete by appropriate material selection and mix design. The environmental potential of RAC is considered because it helps in the reduction of waste that being dumped on landfills causing the shortage of land for other purposes and reduction in the consumption of natural aggregates. The future of RAC not only depends on the research to increase the percentage of RAC but also on producing high-quality RAC and designing concrete around its characteristics.

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Copyright

Copyright © 2026 Sneha ., Dr. M K Sehra. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.