Reuse of cement-solidified municipal incinerator fly ash in cement mortars: physico-mechanical and leaching characteristics.
The reuse of cement-solidified Municipal Solid Waste Incinerator (MSWI) fly ash (solidified/stabilised (S/S) product) as an artificial aggregate in Portland cement mortars was investigated. The S/S product consisted of a mixture of 48 wt.% washed MSWI fly ash, 20 wt.% Portland cement and 32 wt.% water, aged for 365 days at 20 degrees C and 100% RH. Cement mortars (water/cement weight ratio=0.62) were made with Portland cement, S/S product and natural sand at three replacement levels of sand with S/S product (0%, 10% and 50% by mass). After 28 days of curing at 20 degrees C and 100% RH, the mortar specimens were characterised for their physico-mechanical (porosity, compressive strength) and leaching behaviour. No retardation in strength development, relatively high compressive strengths (up to 36 N/mm2) and low leaching rates of heavy metals (Cr, Cu, Pb and Zn) were always recorded. The leaching data from sequential leach tests on monolithic specimens were successfully elaborated with a pseudo-diffusional model including a chemical retardation factor related to the partial dissolution of contaminant.
Cinquepalmi
Maria Anna
MA
Facoltà di Ingegneria, Università di Roma La Sapienza, via Eudossiana, 18-00184 Roma, Italy.
Mangialardi
Teresa
T
Panei
Liliana
L
Paolini
Antonio Evangelista
AE
Piga
Luigi
L
D002244:Carbon / Q000032:analysis / Q000737:chemistry*; D060729:Coal Ash; D019245:Compressive Strength; D003252:Construction Materials; D004058:Diffusion; D006863:Hydrogen-Ion Concentration; D017745:Incineration; D007220:Industrial Waste; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry; D015233:Models, Statistical; D052638:Particulate Matter / Q000032:analysis / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D018505:Waste Management
D060729:Coal Ash; D007220:Industrial Waste; D019216:Metals, Heavy; D052638:Particulate Matter; D002244:Carbon