Fresh and hardened properties of self-compacting concrete containing recycled fine clay brick aggregates

Fresh and hardened properties of self-compacting concrete containing recycled fine clay brick aggregates

Zhang, Hongzhi (Shandong University)
Yuan, Huaqiang (Shandong University)
Ge, Zhi (Shandong University)
Wu, Jiajie (Shandong University)
Fang, Cheng (Shandong University)
Schlangen, E. (TU Delft Materials and Environment)
Šavija, B. (TU Delft Materials and Environment)

2021

Clay brick is one of the major components of demolition waste, which is generally landfilled. Effective and new uses of recycled clay brick may provide sustainability benefits in terms of landfill reduction. Therefore, this research aims at applying Recycled fine clay brick aggregates (RFCBA) with sizes from 0.075 mm–4.75 mm to prepare Self-compacting concrete (SCC). The effects of RFCBA on fresh and hardened properties of SCC were investigated. Saturated surface dry RFCBA was used to replace Natural fine aggregate (NFA) with the percentage of 25%, 50%, 75% and 100%, respectively, in making the SCC mixes. Although experimental results showed that the flowability, passing ability, and segregation resistance of SCC containing RFCBA (RFCBA-SCC) decreased with the increasing RFCBA content, these properties still satisfy the criteria of SCC. The compressive strength, splitting strength, flexural strength, and elastic modulus of the RFCBA-SCC mixes decreased with an increase of RFCBA content. Due to their porous nature, recycled fine clay brick aggregates may also be a source of additional water for internal curing. The internal curing effect was confirmed by the mercury intrusion porosimetry, X-ray diffraction, and thermogravimetric analysis measurements. Moreover, a significant autogenous shrinkage reduction of SCC is achieved by using the RFCBA due to the release of additional water pre-stored in the RFCBA. Therefore, it can be concluded that the addition of RFCBA to SCC mixtures can provide additional practical benefits in the hardened state.

Recycled fine clay brick aggregate
Selfcompacting concrete
Rheology properties
Mechanical properties
Microstructures
Self-compacting concrete

http://resolver.tudelft.nl/uuid:704bcad1-146f-4645-85ca-acb73fc01f48

https://doi.org/10.1617/s11527-021-01751-5

2022-01-13

1359-5997

Materials and Structures, 54 (4), 1-13

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public

Institutional Repository

journal article

© 2021 Hongzhi Zhang, Huaqiang Yuan, Zhi Ge, Jiajie Wu, Cheng Fang, E. Schlangen, B. Šavija