首页|Advanced compound treatment strategies for brick-concrete recycled aggregates: Focusing on volcanic ash slurry and innovative chemical solution

Advanced compound treatment strategies for brick-concrete recycled aggregates: Focusing on volcanic ash slurry and innovative chemical solution

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  • NETL
  • NSTL
  • Elsevier
The recycling of construction waste into brick-concrete recycled aggregates (BCRA) addresses resource conservation needs, yet properties deficiencies hinder its application. While single chemical modification can offer potential solutions by enhancing BCRA to some extent, achieving comprehensive optimization of properties with concurrent enhancements in economic viability and environmental sustainability remains challenging. Accordingly, this study developed compound modification strategies integrating volcanic ash slurry (VAS) with osmotic crystalline waterproofing agents (OCW) or phosphate-induced precipitation materials (PIP). The aggregate properties and concrete strength were investigated to evaluate modification efficiency. Microstructure characteristics was examined to reveal mechanisms, and environmental-economic benefits were assessed. The results indicated that compound treatments neutralized single-treatment drawbacks while amplifying benefits. VAS&OCW outperformed in improving BCRA's water absorption (37.1 %) and crushing value (36.1 %), whereas VAS&PIP exhibited greater efficacy in boosting apparent density. BCRA optimization elevated recycled concrete strength, particularly VAS&OCW achieving a 10.0 % compressive strength increase. Microstructural variation well supported property improvement, wherein VAS&OCW formed gels, rigid-flexible networks, and hydrophobic films through interactions between their components to enhance BCRA. VAS&PIP improved BCRA properties through hydroxyapatite induced by inter-modifier reactions. VAS&OCW-modified concrete exhibited higher strength-ecology and strength-cost efficiencies, demonstrating greater environmental-economic benefits. These findings are significant for advancing BCRA utilization.

Brick-concrete recycled aggregateCompound modification treatmentMorphological characteristicsMechanical strengthInteraction mechanismEnvironmental-economic evaluation

Xiaoqian Dai、Aiqin Shen、Ziming He、Xiaosen Zuo、Yinchuan Guo、Zhennan Li

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Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xian, Shanxi 710064, China

School of Civil and Architectural Engineering Liaoning University of Technology, Jinzhou, Liaoning 121001, China

School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, 310018 China

2025

10.1016/j.conbuildmat.2025.141252

Construction & Building Materials

Construction & Building Materials

ISSN：0950-0618
年,卷(期)：2025.479(Jun.13)
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