Lee Tzen-Chin, Rao Ming-Kang
Department of Civil and Disaster Prevention Engineering, National United University, Miao-Li, 360, Taiwan, Republic of China.
Waste Manag. 2009 Jun;29(6):1952-9. doi: 10.1016/j.wasman.2009.01.002. Epub 2009 Feb 11.
Fly- and scrubber-ash (weight ratio of approximately 1:3) from municipal solid waste incinerators (MSWI) are a major land-fill disposal problem due to their leaching of heavy metals. We uniformly mixed both types of ash with optimal amounts of waste glass frit, which was then melted into a glassy slag. The glassy slag was then pulverized to a particle size smaller than 38microm for use as a cement substitute (20-40% of total cement) and blended with sand and cement to produce slag-blended cement-mortar (SCM) specimens. The toxicity characteristics of the leaching procedure tests on the pulverized slag samples revealed that the amount of leached heavy metals was far below regulatory thresholds. The compressive strength of the 28-day cured SCM specimens was comparable to that of ordinary Portland cement mortars, while the compressive strength of specimens cured for 60 or 90 days were 3-11% greater. The observed enhanced strength is achieved by Pozzolanic reaction. Preliminary evaluation shows that the combination of MSWI fly- and scrubber-ash with waste glass yields a cost effective and environmentally friendly cement replacement in cement-mortars.
城市固体废弃物焚烧炉（MSWI）产生的飞灰和洗涤灰（重量比约为1:3）由于重金属的浸出，成为主要的填埋处置难题。我们将这两种灰与适量的废玻璃粉均匀混合，然后熔化成玻璃状炉渣。接着将玻璃状炉渣粉碎至粒径小于38微米，用作水泥替代品（占水泥总量的20 - 40%），并与沙子和水泥混合，制成矿渣掺合水泥砂浆（SCM）试件。对粉碎后的炉渣样品进行浸出程序试验的毒性特征表明，重金属的浸出量远低于监管阈值。养护28天的SCM试件的抗压强度与普通波特兰水泥砂浆相当，而养护60天或90天的试件的抗压强度则高出3 - 11%。观察到的强度增强是通过火山灰反应实现的。初步评估表明，MSWI飞灰和洗涤灰与废玻璃的组合在水泥砂浆中产生了一种经济高效且环保的水泥替代品。
