Sintering of MSW fly ash for reuse as a concrete aggregate.
Sintering of MSW fly ash for reuse as a concrete aggregate.
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DOI：
10.1016/s0304-3894(01)00286-2
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发表时间：
2001-10
影响因子：
13.6
通讯作者：
T. Mangialardi
中科院分区：
文献类型：
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作者：
T. Mangialardi
以城市生活垃圾粉煤灰为原料，研究了其烧结过程，以制备可用作混凝土骨料的烧结制品。在这项研究中，四种类型的飞灰来自不同的意大利垃圾焚烧厂进行了测试。城市生活垃圾飞灰的化学成分的修改-通过初步的四个阶段的这种材料用水洗涤处理-试图改善烧结产品的化学和机械特性。将未经处理或洗涤的粉煤灰在不同的压坯压力、烧结温度和烧结时间下，对直径15 mm、高20 mm的圆柱形压坯进行烧结处理。未经处理的城市生活垃圾粉煤灰的烧结过程被证明是无效的制造烧结产品作为建筑材料的再利用，因为这些粉煤灰的硫酸盐，氯化物和玻璃化氧化物含量方面的不利的化学特性。用水对城市生活垃圾飞灰进行初步洗涤处理，大大改善了烧结产品的化学和机械特性，并且对于所有类型的测试飞灰，烧结产品满足意大利对用于混凝土的正常重量骨料的要求，当分别在圆柱形和立方体试样上测量时，所述混凝土具有不大于12和15 N/mm 2的指定强度。结果表明，压制压力为28 N/mm 2、烧结温度为1140°C、烧结时间为60 min是制备垃圾焚烧飞灰烧结制品的最佳工艺条件。
The sintering process of municipal solid waste (MSW) fly ash was investigated in order to manufacture sintered products for reuse as concrete aggregates. Four types of fly ash resulting from different Italian MSW incineration plants were tested in this study. A modification of the chemical composition of MSW fly ash — through a preliminary four-stage washing treatment of this material with water — was attempted to improve the chemical and mechanical characteristics of sintered products. The sintering treatment of untreated or washed fly ash was performed on cylindrical compact specimens (15mm in diameter and 20mm in height) at different compact pressures, sintering temperatures and times. The sintering process of untreated MSW fly ashes proved to be ineffective for manufacturing sintered products for reuse as a construction material, because of the adverse chemical characteristics of these fly ashes in terms of sulfate, chloride, and vitrifying oxide contents. A preliminary washing treatment of MSW fly ash with water greatly improved the chemical and mechanical characteristics of sintered products and, for all the types of fly ash tested, the sintered products satisfied the Italian requirements for normal weight aggregates for use in concretes having a specified strength not greater than 12 and 15N/mm2, when measured on cylindrical and cubic specimens, respectively. A compact pressure of 28N/mm2, a sintering temperature of 1140°C, and a sintering time of 60min were the best operating conditions for manufacturing sintered products of washed MSW fly ash.