MSWI ashes as mineral additions in concrete

Bertolini, Luca; Carsana, Maddalena; Cassago, D.; Curzio, A. Quadrio; Collepardi, M.

doi:10.1016/j.cemconres.2004.02.001

Cited by 292 publications

(146 citation statements)

References 3 publications

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“…The test for MSWI BA was carried out on a sample crushed to a particle size of less than 4 mm. In the test for concrete cured for 28 days, concrete was broken into several pieces, and a piece from the heart of the concrete was taken as the test sample (average size of 9 mm) (Bertolini et al 2004). …”

Section: Hardened Concretementioning

confidence: 99%

“…Pan et al (2008) introduced pre-washed 1.75 wt% FA and 3.5 wt% BA as a clay replacement in Type-II Portland cement production. Bertolini et al (2004) found that a 30 % replacement (by mass) of Portland cement with wet ground MSWI BA as mineral additive remarkably improved the strength and durability of concrete. Lee et al (2008) extensively studied the 28-day compressive strength of the slag-cement mortar (composed of MSWI FA, scrubber ash and glass frit) was similar to that of ordinary cement mortar, and the 60-and 90-day compressive strengths were 2-11 % higher.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Use of MSWI Bottom Ash in Concrete

Zhang

Zhao

2014

Int J Concr Struct Mater

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An experimental investigation was carried out to evaluate the mechanical properties of concrete mixtures in which coarse aggregate was partially (30, 50 or 70 %) replaced with pre-washed municipal solid waste incineration (MSWI) bottom ash. Results indicated that bottom ash reduced the compressive strength, elastic modulus, and levels of heavy metals in leachate when used as a replacement for gravel, and that the maximum amount of MSWI bottom ash in concrete should not exceed 50 %. To analyze the effect mechanism of bottom ash in concrete, the degree of hydration and the following pozzolanic reaction characterized by the pozzolanic activity index, and the porosity distribution in cement mortar. The study indicates that improved properties of concrete are not solely later strength gain and reduced levels of heavy metals in leachate but also the progression of pozzolanic reactions, where a dense structure contains a higher proportion of fine pores that are related to durability.

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Section: Hardened Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Use of MSWI Bottom Ash in Concrete

Zhang

Zhao

2014

Int J Concr Struct Mater

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“…The solution lies in a treatment procedure which will reduce content of dangerous components in ashes. The simplest is the water washing which reduces the chloride content and could solve the problems of ESP fly ash [16]. The other in literature proposed way -the vitrification of fly ashes -is technologically and energetically unfavored.…”

Section: Discussionmentioning

confidence: 99%

Environmental friendly concrete production using municipal solid waste incineration materials

Pavlík¹,

Keppert²,

Pavlíková³

et al. 2011

Management of Natural Resources, Sustainable Development and Ecological Hazards III

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The building industry, especially construction materials' production, is a major user of the world's resources and together with energy production one of the most important sources of the CO 2 production. Among building materials, concrete is element which is the second most consumed substance in the world, whereas only water is used in greater quantities. Apparently, almost one ton of concrete is used for each person in the world each year. From the point of view of ecological and sustainable aspects, concrete industry is now recognized as the largest consumer of natural resources and significant producer of waste. In order to preserve clean environment, there is a need for improvement of existing production technologies of concrete by transforming them into sustainable and environmentally friendly. Municipal solid waste incineration (MSWI) materials as fly ashes and bottom ashes have not dissimilar average chemical composition from that of coal fly ashes and slag from iron production. On that account one can assume possible use of MSWI materials as partial Portland cement replacement in concrete mix design or in a raw state as partial aggregate replacement. Since waste treatment represents serious problem for advanced as well as for developing countries, the use of MSWI materials in concrete production is beneficial for both ecological and financial reasons.Three kinds of MSWI fly ashes in state "as received" were characterized and their potential use as filler in cement based mortars was tested. The motivation of this utilization was to replace part of the fine aggregate dose in the mortars. All tested ashes made the mortars properties worse; the reasons and possible solutions are discussed.

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“…As cinzas de fundo já foram investigadas quanto ao seu uso potencial como agregado em concreto 3,4 e em mistura para asfalto 5 . Atualmente, a possibilidade de reutilização das cinzas volantes na construção civil também tem sido cogitada 6,7 , porém, em conseqüência de suas características químicas, com mais cautela.…”

Section: Introductionunclassified

Caracterização das cinzas de incineração de resíduos industriais e de serviços de saúde

Silva¹,

Lange²

2008

Quím. Nova

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Three ash samples from an incinerator in Belo Horizonte (Brazil) were physically and chemically characterized. The chemical composition of the ashes was not always the same, neither in terms of the chemical species nor in terms of the quantities of those that are common to the three ashes. The ashes called CF1 and CF3D contain heavy metals above the detection limits of the analytical methods and the zinc concentration is high enough to justify treatment of the ashes. For these ashes, a high loss on ignition was found, indicating that the process of incineration might present failures.Keywords: fly ash; bottom ash; waste characterization. INTRODUÇÃOOs resíduos sólidos industriais (RSI) e os resíduos de serviços de saúde (RSS), devido às suas características tóxicas e/ou patogênicas, constituem um grande problema para a sociedade e para o meio ambiente. O aumento da preocupação mundial com relação a esse tema tem levado várias nações a reverem suas legislações, tendendo essas a se tornarem cada vez mais restritivas. O cerco tem se fechado principalmente em torno dos geradores, que passam a ser responsabilizados pelos resíduos que produzem, sendo obrigados a destiná-los de forma adequada.Internacionalmente, a incineração tem sido um dos tratamentos preferenciais para os RSI e RSS, sendo utilizada também no caso dos resíduos domésticos. No Brasil, ainda é pouco difundida, devido ao seu custo elevado, sendo os RSI muitas vezes mandados a aterros classe I, enquanto que os RSS são dispostos em celas especiais de aterros sanitários comuns. No entanto, com a diminuição do espaço nacional para construção desses aterros e com o fim da vida útil dos existentes, esta técnica passará a ser uma escolha muito mais viável do que é hoje em dia.A incineração gera outros resíduos como cinzas de fundo, aquelas que permanecem no fundo da caldeira, e cinzas volantes, materiais coletados pelos equipamentos de controle da poluição atmosférica. Na Europa, as cinzas de fundo são, normalmente, classificadas como resíduos classe II e as cinzas volantes, como classe I. Os principais contaminantes das cinzas volantes são os metais pesados e alguns sais que requerem gerenciamento seguro 1 , além de compostos orgânicos clorados 2 . Esses resíduos são em alguns casos dispostos em aterros, mas suas características podem exigir cuidados especiais.Como alternativa ao aterramento, vem aumentando o interesse na incorporação das cinzas em materiais para aplicações em construção. As cinzas de fundo já foram investigadas quanto ao seu uso potencial como agregado em concreto 3,4 e em mistura para asfal-. Atualmente, a possibilidade de reutilização das cinzas volantes na construção civil também tem sido cogitada 6,7 , porém, em conseqüência de suas características químicas, com mais cautela.O uso do processo de solidificação/estabilização em cimento Tem sido estudado como uma opção de tratamento viável para as cinzas de incineração 1,8,9 . Esta tecnologia é barata e fácil de aplicar, entretanto, cada caso particular deve ser analisado cuidadosamente, pois...

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MSWI ashes as mineral additions in concrete

Cited by 292 publications

References 3 publications

Optimal Use of MSWI Bottom Ash in Concrete

Optimal Use of MSWI Bottom Ash in Concrete

Environmental friendly concrete production using municipal solid waste incineration materials

Caracterização das cinzas de incineração de resíduos industriais e de serviços de saúde

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