Abstract: To minimize the depletion of natural resources and optimize the use of fly ash (FA), the manufacture of cold-bonded alkali-activated artificial lightweight aggregates (CAALA) with fly ash (FA) and ground granulated blast furnace slag (GGBFS) were designed and fabricated. This study examined the impact of raw material proportioning on the properties of CAALA, specifically pelletization efficiency, physical properties, mechanical properties, and freeze-thaw resistance capacity. Then, the alkaline dissolution of CAALA was analyzed. Additionally, the analysis revealed that the increase in FA content led to a decrease in hydration products of C-A-S-H gels and an increase in harmful pores (＞200 nm). When the optimal mass ratio of FA and GGBFS was 1∶1, CAALA achieved a pelletization efficiency of 92.01%, a loose bulk density of 1 072 kg/m3 and a water absorption of 10.8% within 1 h. Additionally, it shows a cylinder compressive strength of 14.65 MPa, a pH of dissolution solution after 24 hours is 11.87 and a mass loss rate of 3.34% after 15 freeze-thaw cycles. Therefore, the use of FA in CAALA may be a suitable method for preparing non-structural concrete below C30 grade.
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2024, Vol. 38 
