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Properties of eco-friendly self-compacting concrete containing modified treated palm oil fuel ash

机译：改性棕榈油燃料灰的环保型自密实混凝土的性能

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Palm oil fuel ash (POFA) is an agro-waste byproduct disposed as landfills without being recycled. Ground POFA is a suitable supplementary cementitious material that can be utilized in different types of concrete. However, problems associated with the reduction of workability and early-age compressive strength of concrete, as well as limited replacement levels of POFA, have been encountered. Heat treatment of ground POFA (T-POFA) can effectively enhance the performance of POFA and reduce its limitations. However, the energy consumed during such heat treatment is high. Moreover, limited original POFA (approximately 30%) can be used to prepare T-POFA. In this study, a new method was introduced to prepare treated POFA, called modified treated POFA (MT-POFA) with full usage of original POFA. MT-POFA was then used as a cement replacement at 0%, 30%, 50%, and 70% to produce sustainable self compacting concrete. Test results showed that the fresh properties of all concretes containing MT-POFA were ranged within SCC requirements. The mechanical properties exhibited a reduction in the early ages of MT-POFA concretes; however, with increased curing time, these properties were significantly improved. SCC incorporating MT-POFA exhibited significant resistance against rapid chloride permeability test and elevated temperature, and performed better than the control SCC. In general, MT-POFA exhibited significant potential use as a cement replacement in self-compacting concrete. (C) 2017 Elsevier Ltd. All rights reserved.
机译：棕榈油燃料灰（POFA）是一种农业废弃物副产品，被当作垃圾填埋场处理而没有回收。地面POFA是一种合适的补充胶凝材料，可用于不同类型的混凝土中。然而，已经遇到了与降低混凝土的可加工性和早期抗压强度以及有限的POFA替换水平有关的问题。地面POFA（T-POFA）的热处理可以有效增强POFA的性能并减少其局限性。然而，在这种热处理期间消耗的能量很高。此外，有限的原始POFA（约30％）可用于制备T-POFA。在这项研究中，引入了一种新方法来制备经处理的POFA，称为完全处理原始POFA的改性处理过的POFA（MT-POFA）。然后将MT-POFA以0％，30％，50％和70％的比例用作水泥替代品，以生产可持续的自密实混凝土。测试结果表明，所有含MT-POFA的混凝土的新鲜性能均在SCC要求范围内。力学性能表现出MT-POFA混凝土早期的降低。然而，随着固化时间的增加，这些性能得到了显着改善。掺有MT-POFA的SCC表现出对快速氯化物渗透性测试和高温的显着抵抗力，并且比对照SCC表现更好。通常，MT-POFA在自密实混凝土中显示出巨大的潜在用途，可作为水泥的替代品。 （C）2017 Elsevier Ltd.保留所有权利。

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