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Cited by 12Geotechnical and construction materials studiesRecycled Aggregate Concrete PerformanceMaterials Engineering and Processing

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Performance Improvement and Microstructure Characterization of Cement-Stabilized Roadbase Materials Containing Phosphogypsum/Recycled Concrete Aggregate

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Wu, Yang, Bian, Xiaoya, Liu, Jie, Chi, Ruan, Chen, Xuyong·2023·Materials
DOI 10.3390/ma16196607PMC PMC10574210
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Abstract

The proper reutilization of the phosphogypsum (PG) by-product derived from the production of phosphoric acid and recycled concrete aggregate (RCA) from waste concrete in roadbase materials is of great necessity and importance. This investigation tried seeking a new approach to reuse them to high quality, including turning PG into calcinated PG (CPG) via washing and calcination, as well as adopting sodium metasilicate nonahydrate (SMN) to strengthen the roadbase materials of cement-stabilized CPG and RCA. Upon the mix design, with a series of experiments including unconfined compressive strength, the wet–dry cycle, freeze–thaw cycle, and scanning electron microscopy, the comprehensive effects of PG treatment, the CPG to RCA mix ratio, SMN dosage, wet–dry cycle and freeze–thaw cycle on the road performance of roadbase materials were well evaluated, and the traffic bearing capacity and microstructure characteristics were also analyzed. The results demonstrate that the 7 d unconfined compressive strength of CPG/RCA roadbase materials can reach 5.34 MPa as the CPG and SMN dosage are 20% and 11%, respectively, which meets the requirements of an extremely and very heavy traffic grade. After five wet–dry cycles and freeze–thaw cycles, the resistance of the CPG/RCA roadbase materials to moisture and frost was significantly improved as 11% SMN was added. Meanwhile, SMN contributes to the reduction in crack width and densifies the microstructure of CPG/RCA roadbase materials. The research results can be used to provide new guidance for building more durable roadbase materials.

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Research works printed but not linked: 32

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Metadata

Authors
Wu, Y., Bian, X., Liu, J., Chi, R., & Chen, X.
Affiliations
  • Wuhan Institute of Technology (CN)
  • Hubei Three Gorges Laboratory (CN)
Corresponding author
Chen, Xuyong
ORCID
Venue
Materials
Publisher
MDPI AG
Published
2023-10-09
Volume
16
Issue
19
Pages
6607
ISSN
1996-1944 (ISSN-L)
DOI
10.3390/ma16196607
PMC
PMC10574210
OpenAlex
W4387460045
Cited by
12
References
32
Citations by year
2026: 3 · 2025: 4 · 2024: 4 · 2023: 1
FWCI
1.40
Type
journal article
Language
en
Open access
Licence
Locations
  • Materials (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • Open and Innovation Fund of Hubei Three Gorges Laboratory (SC211011, 2022022202015022, 2023177)
  • Key Research and Development Program of Wuhan Science and Technology Department (SC211011, 2022022202015022, 2023177)
  • Science and Technology Plan Project of the Department of Housing and Urban-Rural Development of Hubei Province (SC211011, 2022022202015022, 2023177)
Topics
  • Physical Sciences › Engineering › Civil and Structural Engineering › Geotechnical and construction materials studies
  • Physical Sciences › Engineering › Building and Construction › Recycled Aggregate Concrete Performance
  • Physical Sciences › Engineering › Building and Construction › Materials Engineering and Processing
Keywords
phosphogypsum, recycled concrete aggregate, concrete recycling, unconfined compressive strength, wetting-drying cycles, freeze-thaw cycles, microstructure, crack width, durability

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