Accelerated carbonation of biochar reinforced cement fly ash composites: Enhancing and sequestering CO2 in building materials
Abstract Biochar produced from the pyrolysis of corn stover biomass was added as a filler material in the cement fly ash blocks as 2% 4% 6% and 8% of total weight. The resultant blocks were subjected to two hours mineral carbonation at (3 day) after demoulding to enhance the CO2 uptake and sequester carbon in the blocks. Along with that, 28 days compressive strength of un carbonated blocks was determined to gauge the effect of biochar as the filler material on the strength of the specimens. Results showed that there was an enhanced CO2 uptake on 3 days compressive strength and biochar dosage was optimised at 4% and 6% depending on the chosen mix. The 28 days compressive strength of un carbonated blocks showed that there was an increase in the strength as biochar addition increased to a certain extent, however, thereafter it decreased with the further addition of biochar.