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Effect of bottom ash on the strength characteristics of fly ash and bottom ash mixtures

机译:底灰对粉煤灰和底灰混合物强度特性的影响

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摘要

One of the sources to produce electricity is coal. The major problem of the coal combustion based power plant is producing huge quantities of solid waste. Fly ash (FA) and bottom ash (BA) are two major contributions in the coal combustion products (CPP). Generally, most CPP are just dumped into the waste pond. The insufficient place for waste dumping is becoming an issue since the amount of CPP waste is increasing drastically. Recently, there are efforts to use the FA and BA together as mixtures in geotechnical engineering works. This paper focuses on the effect of BA content on the strength characteristic of fly ash and bottom ash mixtures, for coal ash taken from the Tanjung Bin power plant in Johor, Malaysia. This study investigates the effect of curing period on the morphology, chemical and strength characteristic of FA-BA mixtures that consists of 30 % and 70% BA.The mixtures had been tested in laboratory through Scanning Electron Microscopic test, X-Ray Fluorescences test and Consolidated Undrained triaxial test. Major chemical compostion of FA-BA mixtures are silica, alumina, ferum oxide and calcium oxide. The value of modulus of elasticity decreased with the increase of bottom ash content from 30% to 70% in the ash mixtures. The internal friction angle at critical state,??c’, was decreased as the content of BA is increased from 30% to 70%. Without curing periods, the increased of BA content from 30% to 70% did not give any significant effect on the critical state shear strength. However, after 28 days curing periods, the ?c’ was increased, but it is not that significant. It is also observed that the ?c’ of both mixtures with 30%BA and 70%BA are in the same range as the typical dense sands. Generally, it can be concluded that there is no significant effect on the shear strength properties at critical state for FA-BA mixtures at 30%BA and 70%BA. Hence, there will be a great potential to use a large quantity of BA in the mixtures without compromising the strength which can be a great benefit for usage in various geotechnical engineering works.
机译:产生电力的来源之一是煤炭。燃煤发电厂的主要问题是产生大量的固体废物。粉煤灰(FA)和底灰(BA)是煤燃烧产物(CPP)的两个主要贡献。通常,大多数CPP只是倒入废物池。由于CPP废物的数量急剧增加,因此废物堆放的地方不足成为一个问题。最近,人们在岩土工程工作中努力将FA和BA混合使用。本文重点研究了BA含量对粉煤灰和底灰混合物强度特性的影响,这些粉煤灰取自马来西亚柔佛州丹绒宾电厂。本研究探讨了固化时间对由30%和70%BA组成的FA-BA混合物的形态,化学和强度特性的影响。该混合物已在实验室通过扫描电子显微镜测试,X射线荧光测试和固结不排水三轴试验。 FA-BA混合物的主要化学成分是二氧化硅,氧化铝,氧化铁和氧化钙。弹性模量的值随着灰分混合物中底灰含量的增加从30%降低到70%。随着BA含量从30%增加到70%,临界状态下的内摩擦角Δθc’减小。没有固化时间,BA含量从30%增加到70%不会对临界剪切强度产生任何显着影响。然而,经过28天的固化后,“ c”值有所增加,但意义并不大。还观察到,两种含30%BA和70%BA的混合物的?c'与典型的致密砂在同一范围内。通常,可以得出结论,对于30%BA和70%BA的FA-BA混合物,在临界状态下的剪切强度性能没有显着影响。因此,在混合物中使用大量BA而又不影响强度的潜力很大,这对于在各种岩土工程工作中的使用是非常有益的。

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    Ling Jacky Jia Yii;

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  • 年度 2013
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