Tang Pei, Xuan Dongxing, Cheng Hiu Wun, Poon Chi Sun, Tsang Daniel C W
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
J Hazard Mater. 2020 Jan 5;381:120951. doi: 10.1016/j.jhazmat.2019.120951. Epub 2019 Jul 31.
In this study, concrete slurry waste (CSW) obtained from ready-mixed concrete plants was recycled as a fresh cementitious binder and used together with municipal solid waste incineration (MSWI) fine bottom ash (IBA) from waste-to-energy plants to produce cold bonded lightweight aggregates (CBLAs) by using a pelletizing technique. The influence of different curing methods on the properties of the produced CBLAs were experimentally investigated, including moist curing, steam curing, and accelerated CO curing at 0.1 bar and flow-through CO curing under ambient pressure. The results showed that CBLAs obtained by steam curing at 60 °C had the highest pellet strength, and the CO cured samples had the lowest water absorption values. CO curing with a pressure of 0.1 bar promoted a better pellet strength. The CO curing method can sequestrate 3.5-4.1% (by mass of pellets) of CO, which can serve as a sustainable CO sequestration process to produce CBLAs.
在本研究中，将从预拌混凝土厂获得的混凝土浆体废料（CSW）作为一种新型胶凝材料进行回收利用，并与垃圾焚烧发电厂的城市固体废弃物焚烧（MSWI）细底灰（IBA）一起，采用造粒技术生产冷粘结轻质集料（CBLA）。通过实验研究了不同养护方法对所生产的CBLA性能的影响，包括潮湿养护、蒸汽养护、0.1巴压力下的加速CO养护以及常压下的流通式CO养护。结果表明，60℃蒸汽养护得到的CBLA具有最高的颗粒强度，而CO养护的样品具有最低的吸水率。0.1巴压力的CO养护促进了更好的颗粒强度。CO养护方法可封存3.5 - 4.1%（按颗粒质量计）的CO，这可作为一种可持续的CO封存工艺来生产CBLA。
