1. The hydration and heavy metal immobilization performance of the CO2-active incineration fly ash-calcined clay-cement (CFC3) composite low-carbon cementitious system.
- Author
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Hu, Junjie, Niu, Renjie, Liu, Junyao, Zhang, Weizhuo, Liu, Jun, and Xing, Feng
- Subjects
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INCINERATION , *FLY ash , *HYDRATION , *SOLID waste , *CEMENT composites , *POROSITY - Abstract
CO 2 -active enhances the performance of municipal solid waste incineration fly ash as a supplementary cementitious material, increasing its utilization in cementitious systems. CFC3, a low-carbon cementitious material, effectively utilizes CO 2 -active incineration fly ash (CIFA). To minimize cement usage, the component effects on hydration need to be studied. In this study, hydration, mechanical and environmental properties of CFC3 were evaluated based on cement dosage and calcined clay/CIFA values. The maximum compressive strength of the samples reached 18.0 MPa at 3d and 47.6 MPa at 56d. The introduction of CIFA delayed the reactions of C 3 S and aluminates. Calcined clay contributes to improved gel polymerization, optimizes the Si/Al CASH ratio, and refines pore structure. A decrease in cement content increased in the aluminate phases, making monocarbonate the primary hydration product. The results of leaching tests indicated that Cd and Pb in R2C50 were transformed into non-leachable, inactive substances. Demonstrating the environmental friendliness of CFC3. • CFC3 is a low-carbon material can effectively utilize incineration fly ash. • The use of incineration fly ash causes extra ettringite and Friedel's salt. • Higher calcined clay usage resulted in two distinct aluminate reaction periods. • CFC3 can reduce the cement content to 35%. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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