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• W4283749845 endingPage "128268" @default.
• W4283749845 startingPage "128268" @default.
• W4283749845 abstract "• Pelletized artificial aggregates were manufactured through alkali -activated technology. • An optimal formulation of artificial aggregates was designed for concrete use. • Artificial aggregates with high strength and low water absorption were achieved. • Internal pore structures of artificial aggregates were analyzed by X-ray computed tomography. The shortage of natural aggregates caused by massive infrastructure construction has promoted the development of alternative aggregates. In this study, artificial aggregates based on alkali-activated technology were designed and manufactured, where fly ash (FA) and a blended sodium silicate/hydroxide solution were used as the precursor and activator, respectively. The mechanical properties, densities, water absorption, reaction products, internal pore distribution, and carbonation resistance of the produced artificial aggregates with different alkali content and activator modulus were investigated to ensure their usability in concrete. The experimental results showed that the artificial aggregate with an alkali content of 5.5% and an activator modulus of 1.5 was found to be the optimal formulation in this study, considering the varied properties and the dosage of activator. The strength of long-term cured aggregates increased slightly when the modulus was increased from 1.2 to 1.5, but decreased significantly when the modulus was further increased to 2.0. The qualitative and quantitative analysis results of X-ray computed tomography images further revealed that the bulk pores inside the aggregate were mainly concentrated in the center, while the capillary pores were primarily distributed near the surface. This study provided the understanding of the internal pore distribution of artificial aggregates synthesized by disc granulation for possible application in concrete." @default.
• W4283749845 created "2022-07-02" @default.
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• W4283749845 date "2022-08-01" @default.
• W4283749845 modified "2023-09-30" @default.
• W4283749845 title "Fly ash-based artificial aggregates synthesized through alkali-activated cold-bonded pelletization technology" @default.
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• W4283749845 doi "https://doi.org/10.1016/j.conbuildmat.2022.128268" @default.
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