Ferraris Monica, Salvo Milena, Ventrella Andrea, Buzzi Luigi, Veglia Massimo
Materials Science and Chemical Engineering Department, Politecnico di Torino, Corso Duca Degli Abruzzi 24, I-10129 Torino, Italy.
Waste Manag. 2009 Mar;29(3):1041-7. doi: 10.1016/j.wasman.2008.07.014. Epub 2008 Oct 8.
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.
来自意大利北部一座城市固体废弃物焚烧炉（MSWI）的底灰在不添加任何玻璃化剂的情况下于1450摄氏度进行了玻璃化处理，然后研磨并筛分成不同粒度（范围从50微米至20毫米），用作混凝土的填料、砂或集料。通过坍落度试验（UNI 9418）、碱 - 硅反应性（UNI 8520/22和ASTM C 298）以及抗压强度试验（UNI 6132、6132/72、6686/72）对样品进行表征，并与未使用玻璃化底灰（VBA）获得的参考样品进行比较。我们的结果表明，玻璃化底灰不适宜替代砂；然而，含有高达20 wt.%用作水泥替代品的VBA填料以及高达75 vol.%用作天然集料替代品的VBA的混凝土，其力学性能与参考样品相同。在两年时间后，含VBA的混凝土样品中未观察到碱 - 硅或其他有害反应。这项工作的结果表明，MSWI的玻璃化底灰可用于替代砂浆和混凝土生产中的天然集料。
