Cinquepalmi Maria Anna, Mangialardi Teresa, Panei Liliana, Paolini Antonio Evangelista, Piga Luigi
Facoltà di Ingegneria, Università di Roma La Sapienza, via Eudossiana, 18-00184 Roma, Italy.
J Hazard Mater. 2008 Mar 1;151(2-3):585-93. doi: 10.1016/j.jhazmat.2007.06.026. Epub 2007 Jun 12.
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.
研究了将水泥固化的城市固体废弃物焚烧炉（MSWI）飞灰（固化/稳定化（S/S）产物）作为波特兰水泥砂浆中的人工骨料进行再利用的情况。该S/S产物由48 wt.% 的水洗MSWI飞灰、20 wt.% 的波特兰水泥和32 wt.% 的水混合而成，在20℃和100%相对湿度下养护365天。水泥砂浆（水/水泥重量比 = 0.62）由波特兰水泥、S/S产物和天然砂制成，其中S/S产物对砂的替代水平有三个（按质量计分别为0%、10%和50%）。在20℃和100%相对湿度下养护28天后，对砂浆试件的物理力学性能（孔隙率、抗压强度）和浸出行为进行了表征。结果始终显示，强度发展未出现延迟，抗压强度相对较高（高达36 N/mm²），重金属（Cr、Cu、Pb和Zn）的浸出率较低。用一个包含与污染物部分溶解相关的化学阻滞因子的准扩散模型成功地阐述了整体试件连续浸出试验的浸出数据。
