Use parent concrete strength and equivalent water absorption of recycled concrete aggregates to identify concrete properties

Abstract

This article focuses to study some properties of recycled aggregate concretes (RAC) according to the equivalent water absorption of aggregates and the parent concrete strength of RCA and thus new relationships were deduced. The results indicated that 1% increase of the equivalent water absorption induced 0.12% increase in superplasticiser dosages. The hyperbolic model seems to be more adequate to estimate compressive strength and shrinkage of RAC when the parent concrete strength and the equivalent water absorption were introduced. According to the obtained results, the parent concrete strength of RCA must not be less than 10 MPa than that of the reference concrete to avoid the drop in compressive strength. For high equivalent water absorption, the ultimate shrinkage became higher and slower.

Keywords:

• Recycled aggregate
• equivalent water absorption
• compressive strength
• parent concrete
• workability
• shrinkage

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Authors’ contributions

Benmiloud Houssam Eddine: Conceptualisation, methodology, writing. Adjoudj M’Hamed: Software, validation, visualisation. Ezziane Karim: Supervisor, investigation, format analysis.

Disclosure statement

All authors declare that they have no conflict of interest.