Accelerated carbonation of alkaline construction sludge by paper sludge ash-based stabilizer and carbon dioxide

Construction sludge frequently has high alkalinity after its generation or during the intermediate treatment process. The aim of this study is to experimentally investigate potential combining accelerated carbonation and a paper ash-based stabilizer (PSAS) neutralize construction in short period improve strength for use as recycled material. experimental results indicate that addition PSAS significantly granulated alkaline sludge, once granulated, successfully pH neutralization sludge. It was also found decrease dry density ?d degree saturation Sr PSAS-treated able reduce required neutralization, tN. thought allow fresh CO2 gas penetrate specimen more easily. However, if below certain limit, it does not strongly facilitate reduction This implies cannot be when amount water level. Moreover, mean particle diameter D50 affected development evaluated using series cone index tests. without decreased by carbonation, but increased even present. Due porosities remaining PS ash particles, most contribution absorption retention performance secured carbonation. In addition, particles retained their granular shape some extent. Therefore, presumed friction interlocking did significantly. that, qc rapidly than PSAS. A further detailed examination test showed under air-curing conditions, treated with relatively gradually compared