Use of vitrified MSWI bottom ashes for concrete production.
Bottom ashes from a north Italian municipal solid waste incinerator (MSWI) were vitrified at 1450 degrees C without adding any vitrifying agent, then ground and sieved to different granulometry (ranging from 50 microm to 20mm), and used as filler, sand, or aggregate for concrete. Samples were characterized via slump tests (UNI 9418), alkali-silica reactivity (UNI 8520/22 and ASTM C 298), and compression strength tests (UNI 6132, 6132/72, 6686/72), and compared to reference samples obtained without vitrified bottom ashes (VBA). Our results show that vitrified bottom ashes are unsuitable as a sand substitute; however, concrete containing up to 20 wt.% of VBA filler used as a substitute for cement and up to 75 vol.% of VBA as a substitute for natural aggregate retains the same mechanical properties as reference samples. Alkali-silica or other detrimental reactions were not observed in VBA-containing concrete samples after a period of two years. The results of this work demonstrate that vitrified bottom ashes from MSWI can be used instead of natural aggregates in mortar and concrete production.
Ferraris
Monica
M
Materials Science and Chemical Engineering Department, Politecnico di Torino, Corso Duca Degli Abruzzi 24, I-10129 Torino, Italy.
Salvo
Milena
M
Ventrella
Andrea
A
Buzzi
Luigi
L
Veglia
Massimo
M
D002244:Carbon / Q000737:chemistry*; D002947:Cities; D060729:Coal Ash; D019245:Compressive Strength; D003252:Construction Materials; D005374:Filtration; D017745:Incineration; D007558:Italy; D008422:Materials Testing; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D052638:Particulate Matter / Q000737:chemistry*; D012037:Refuse Disposal; D012822:Silicon Dioxide; D013997:Time Factors
D060729:Coal Ash; D052638:Particulate Matter; D002244:Carbon; D012822:Silicon Dioxide