城市固体废弃物焚烧飞灰在混凝土混合物中的再利用。

Reuse of municipal solid wastes incineration fly ashes in concrete mixtures.

作者信息

Collivignarelli Carlo, Sorlini Sabrina

出版信息

Waste Manag. 2002;22(8):909-12. doi: 10.1016/s0956-053x(02)00085-5.

Abstract

This study is aimed at assessing the feasibility of concrete production using stabilized m.s.w. (municipal solid waste) incineration fly ashes in addition to natural aggregates. The tested fly ashes were washed and milled, then stabilized by a cement-lime process and finally were reused as a "recycled aggregate" for cement mixture production, in substitution of a natural aggregate (with dosage of 200-400 kg m(-3)). These mixtures, after curing, were characterized with conventional physical-mechanical tests (compression, traction, flexure, modulus of elasticity, shrinkage). In samples containing 200 kg(waste) m(-3)(concrete), a good compressive strength was achieved after 28 days of curing. Furthermore, concrete leaching behavior was evaluated by means of different leaching tests, both on milled and on monolithic samples. Experimental results showed a remarkable reduction of metal leaching in comparison with raw waste. In some cases, similar behavior was observed in "natural" concrete (produced with natural aggregates) and in "waste containing" concrete.

摘要

本研究旨在评估除天然骨料外，使用稳定化的城市固体废弃物（MSW）焚烧飞灰生产混凝土的可行性。对测试的飞灰进行水洗和粉磨，然后通过水泥-石灰工艺进行稳定化处理，最终作为“再生骨料”用于水泥混合物生产，替代天然骨料（用量为200-400 kg m(-3)）。这些混合物在养护后，通过常规物理力学试验（抗压、抗拉、抗弯、弹性模量、收缩）进行表征。在含有200 kg（废弃物）m(-3)（混凝土）的样品中，养护28天后获得了良好的抗压强度。此外，通过不同的浸出试验对磨碎样品和整体样品的混凝土浸出行为进行了评估。实验结果表明，与原始废弃物相比，金属浸出显著减少。在某些情况下，“天然”混凝土（由天然骨料制成）和“含废弃物”混凝土表现出相似的行为。