Study on the Useful of Scrubber Residue from Municipal Solid Waste for the Fine Aggregate of Concrete

干式洗涤系统中城市生活垃圾燃烧后的洗涤渣经过中间处理后，几乎全部弃置于地下。因为城市生活垃圾焚烧炉残渣与水接触后pH值高，且高浓度氯化物和铅等重金属被浸出。然而，近年来由于垃圾填埋场的短缺和环境污染问题，垃圾焚烧残渣的资源化利用成为迫切需要。本文研究了城市生活垃圾焚化渣对混凝土中钢筋的腐蚀和混凝土中重金属的浸出作用。为研究生活垃圾对其抗冻融性能和氯离子渗透性能的影响，进行了加速碳化试验和冻融试验。在实验中，水灰比设定为0.55。城市生活垃圾替代水泥的比例分别为0、10、20、50%。城市生活垃圾混凝土的坍落度损失通过使用引气和高范围减水剂得到补偿。实验结果总结如下：(1)焚烧飞灰浸出，Pb通过老化还原，Pb和Cl^-通过焚烧飞灰洗涤还原。(2)含焚烧粉煤灰混凝土的抗压强度与不含粉煤灰混凝土的抗压强度相当，但因粉煤灰处理方式的不同而略有不同。(3)含老化焚烧飞灰混凝土的碳化深度和氯离子含量均随灰分的增加而增加。(4)在所有替代率下，火灰破坏后替代海砂的混凝土中铅的洗脱量均满足土壤环境标准。

Scrubber residue of dry scrubber systems from combustion of municipal solid waste (MSW) are almost disposed in ground after the intermediate process. Because MSW incinerator residue show high pH values when brought in contact with water, and high-density chloride, and heavy metals such as Pb are leached. However, the resource recycling of MSW incinerator residue are recently required because of the shortage of the land fill lot and the environmental pollution. This report investigates the role of MSW incinerator residue on the corrosion of steel bars in concrete, and leaching heavy metals from concrete. To study the effects of MSW on the freeze-thaw resistance and the chloride penetration, the accelerated carbonation test and the freezing and thawing test were performed. In the experiments, the water-cement ratio was set to 0.55. The percentages of cement replacement by MSW were selected as 0, 10, 20 and 50% weight. Slump loss of MSW concrete was compensated by the use of a air-entraining and high-range water-reducing agent.The results of the experiments are summarized as follows :(1)As for leaching of incineration fly ash, Pb is reduced by aging, while Pb and Cl^- are reduced by washing of incineration fly ash.(2)The compressive strength of concrete containing incineration fly ash is comparable to that of concrete with no fly ash, though the values slightly vary depending on the fly ash treatment method.(3)Both the carbonation depth and chloride content of concrete containing aged incineration fly ash tend to increase as the ash content increases.(4)The quantity of elution of lead from the concrete which replaced sea sand in destruction by fire ash satisfied soil environmental standard in all substitution rates.