Utilizing lowly-reactive coal gasification fly ash (CGFA) to stabilize aggregate bases

Xiao, Rui; Nie, Qingke; He, Junxi; Lu, Hang; Shen, Zhenglai; Huang, Baoshan

doi:10.1016/j.jclepro.2022.133320

Title: Utilizing lowly-reactive coal gasification fly ash (CGFA) to stabilize aggregate bases

Journal Article · 04 August 2022 · Journal of Cleaner Production

DOI: https://doi.org/10.1016/j.jclepro.2022.133320 · OSTI ID:1881068

Xiao, Rui ^[1]; Nie, Qingke ^[2]; He, Junxi ^[3]; Lu, Hang ^[1]; Shen, Zhenglai ^[4];

^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Hebei Research Inst. of Construction and Geotechnical Investigation Co. Ltd., Shijiazhuang (China)The Technology Center of Geotechnical Engineering of Hebei Province, Shijiazhuang (China)
Tongji Univ., Shanghai (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

This study explored the feasibility of utilizing lowly-reactive coal gasification fly ash (CGFA) for stabilizing road aggregate bases. Three types of aggregate stabilizers including the ordinary Portland cement (OPC)-CGFA, hydrated lime (CH)-CGFA and alkali-activated CH-CGFA were evaluated based on the performances of compacted base specimens. It was found that the OPC-CGFA stabilized bases showed better mechanical and durability properties while the CH-CGFA samples had low water stability and freeze-thaw durability due to the dissolution of unreacted CH. However, the reaction degree of CGFA associated with the performances of CH-CGFA stabilization could be considerably enhanced by the alkali-activation. The sustainability and economic feasibility analyses showed the use of CGFA could significantly reduce the CO₂ emissions and costs, highlighting the synergy between the recycling of CGFA and the construction of sustainable road bases. Here, a framework of selecting CGFA-based stabilizers for road bases was proposed considering the performance ratings of the material properties.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1881068

Journal Information:: Journal of Cleaner Production, Journal Name: Journal of Cleaner Production Journal Issue: 1 Vol. 370; ISSN 0959-6526

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Alkali-activated materials (AAMs)
Cement-treated base (CTB)
Coal gasification fly ash (CGFA)
Supplementary cementitious materials (SCMs)
Water stability

Title: Utilizing lowly-reactive coal gasification fly ash (CGFA) to stabilize aggregate bases

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