Work

Durability and microstructural analyses of concrete produced with treated demolition waste aggregates

Year: 2022

Type: article

Abstract: The incorporation of recycled aggregate (RA) from the construction and demolition waste (C&DW) in civil engineering applications has become a hot research topic worldwide due to the associated environmental benefits of its application. Nonetheless, the poor quality of RA reduced its attraction to be utilized widely in the construction industry. This research examined the effects of soaking RA in cement-pulverized fuel ash-silica fume method (SCP), sand envelope mixing approach (SE), and bi-combination of SCP+SE on the water absorption, resistance to freeze-thaw, and sulphate resistance of recycled aggregate concrete (RAC). This study also investigated the microstructure of the enhanced RACs using scan electron microscopy (SEM) images to validate the experimental results. The enhanced RACs demonstrated improved durability performance which was confirmed by the SEM images. This was ascribed to the strengthened interfacial transition zone, strengthened adhered mortar, better overall interlocking of the treated RA with the new cement paste, filled-up pores and micro-cracks, reduced porosity, and compacted denser microstructure.

Source: Construction and Building Materials

DOI: 10.1016/j.conbuildmat.2022.128597

Authors: Qusai Al-Waked, Jiping Bai, John Kinuthia, Paul Davies

Institution: University of South Wales

Language: English

Topic: Recycled Aggregate Concrete Performance

Subfield: Building and Construction

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $3,780