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Utilization of municipal solid waste incinerator fly ash in cement mortars.

机译：在水泥砂浆中利用城市固体废物焚化炉粉煤灰。

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Disposal of municipal solid waste has become a major problem in many countries around the world. With the benefits of substantial weight and volume reduction and potential energy recovery, incineration has become a promising municipal solid waste (MSW) management option. Despite the fact that incineration reduces volume and mass of the wastes by as much as 80%, there are still residues to be properly managed. This research is aimed at evaluating the potential of different types of MSWI fly ash from an incineration facility to be used in cement mortars by using existing standard test methods for cement and coal fly ash.; Two types of MSWI fly ash samples: chemically treated and untreated fly ashes, were used. The treated fly ash was used to replace fine aggregates while the finer untreated fly ash was used to directly replace cement in mortars. Fractionation by air classification was introduced to separate the raw untreated fly ash into fine and coarse fractions to improve usability. MSWI fly ash, in its raw and fractionated forms, has been characterized with a view to utilizing the material to replace part of portland cement in mortars. Characterization involved chemical and physical analyses, observation under Environmental Scanning Electron Microscope (ESEM), and X-ray fluorescence (XRF) and X-ray Diffraction (XRD) analyses.; Results showed that both raw and fractionated fly ashes significantly enhanced compressive strengths of mortar specimens. Attempts were also made to specify the sources of the additional strength by microstructural examination as well as XRD analyses of the hydration products of MSWI fly ash-cement mortar pastes. A new chemical phase was identified exclusively in the MSWI fly ash-cement paste. High absorption capacity of the fly ashes and the formation of C 3A.CaCl2.10H2O were responsible for the superior strength properties. Toxicity Characteristic Leaching Procedure (TCLP) tests were performed on these specimens to assess the likelihood of heavy metals being released into the environment. The benefits of using MSWI fly ash in mortar are twofold; namely, the cost savings stemming from reduction in the cement used, and the ecological advantage of ensuring a final destination for the ash.
机译：城市固体废物的处置已成为世界许多国家的主要问题。凭借大量减少重量和减少体积以及潜在能量回收的优势，焚化已成为一种有前途的城市固体废物（MSW）管理选择。尽管焚烧使废物的体积和质量减少了80％，但仍有残留物需要妥善处理。这项研究旨在通过使用现有的水泥和粉煤灰标准测试方法，评估来自焚化设施的不同类型MSWI粉煤灰在水泥砂浆中的潜力。使用了两种类型的MSWI粉煤灰样品：经过化学处理的粉煤灰和未经处理的粉煤灰。用处理过的粉煤灰代替细骨料，而用较细的未处理粉煤灰直接代替砂浆中的水泥。引入了通过空气分级进行分级的方法，将未经处理的粉煤灰分为细级和粗级，以提高可用性。 MSWI粉煤灰以其原始和分馏形式进行了表征，目的是利用该材料代替砂浆中的部分硅酸盐水泥。表征包括化学和物理分析，在环境扫描电子显微镜（ESEM）下观察以及X射线荧光（XRF）和X射线衍射（XRD）分析。结果表明，原始和分馏的飞灰均显着提高了砂浆试样的抗压强度。还尝试通过微结构检查以及MSWI粉煤灰水泥砂浆浆水化产物的XRD分析来指定附加强度的来源。仅在MSWI粉煤灰水泥浆中发现了一个新的化学相。飞灰的高吸收能力和C 3 A.CaCl 2 .10H 2 O的形成是其优异的强度性能的原因。对这些样品进行了毒性特征浸出程序（TCLP）测试，以评估重金属释放到环境中的可能性。在灰浆中使用MSWI粉煤灰的好处是双重的。也就是说，由于减少了使用的水泥而节省了成本，并确保了灰烬的最终目的地具有生态优势。

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