Plant biomass ashes in cement-based building materials. Feasibility as eco-efficient structural mortars and grouts

González-Kunz, Rocío N.; Pineda, Paloma; Brás, Ana; Morillas, Leandro

doi:10.1016/j.scs.2017.03.001

Cited by 55 publications

(18 citation statements)

References 142 publications

(173 reference statements)

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“…They reported that the use of wood fly ash as a construction material is beneficial in terms of landfills and reducing CO 2 emissions to atmosphere. The embodied energy, which is the total amount of non-renewable primary energy required for all the direct and indirect processes related to the creation of building, its maintenance and end-life, is very low on its used wood fly ashes, being lower than other types of biomass fly ashes and coal fly ash (González-kunz et al, 2017).…”

Section: Alkali Silica Reactionmentioning

confidence: 99%

Valorisation of wood fly ash on concrete

Teixeira

Camões

Branco

2019

Resources, Conservation and Recycling

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Wood fly ash (WFA) is a waste material produced in power plants as result of forest residues combustion to produce power and heat. In countries like Portugal, this waste is disposed of in landfills. Since this material shows pozzolanic characteristics, several studies have been done to evaluate its use as a construction material. This work shows an overview of some published results about the effect of the utilisation of WFA, as a supplementary cementitious material, on the durability and quality of concrete. The results showed that the increase on the wood fly ash content leads to a negative effect on the concrete properties when compared with a conventional concrete. However, the results showed that the behaviour of wood fly ash concrete is very similar to the coal fly ash concrete, which is the most pozzolanic material used in the world. In terms of durability, it was verified that WFA improved the most of the durability characteristics with the exception of carbonation resistance. However, more experimental analysis needs to be developed in terms of wood fly ash concrete durability. Results suggested that using wood fly ash to replace cement is a valuable sustainable option for concrete production. This manuscript discusses the key factors and attempts to provide new information about the application of the wood fly ash on concrete.

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Section: Alkali Silica Reactionmentioning

confidence: 99%

Valorisation of wood fly ash on concrete

Teixeira

Camões

Branco

2019

Resources, Conservation and Recycling

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“…Moreover, many factors can affect the level of shrinkage, which include environmental conditions, the exposed surface area of the concrete, the amount of concrete constituent material, the physical properties of the concrete constituent aggregate, and the water-cement ratio [ 1 ]. Some added admixture or additive such as water entraining agent [ 2 ], slag [ 3 ], fly ash [ 4 , 5 ], biomass ashes [ 6 ], waterproof material [ 7 ], and also the type of binder used, such as ordinary Portland cement (OPC), Portland composite cement (PCC) and Portland pozzolan cement (PPC), have effects on the shrinkage of the concrete as well. Additionally, fly ash usage in the conrete usually reduces the drying shrinkage both in normal concrete and in self-compacting concrete [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Drying Shrinkage of Concrete Containing Calcium Stearate, (Ca(C18H35O2)2), with Ordinary Portland Cement (OPC) as a Binder: Experimental and Modelling Studies

et al. 2020

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This work investigates the effect of calcium stearate (Ca(C18H35O2)2) on concrete shrinkage behaviors by using experimental testing. The test specimens are cubes with each dimension given as 100 × 100 × 285 mm for shrinkage tests and cylinders with 150 mm diameter and 300 mm height for compressive strength tests. The calcium stearate with fractions of 0, 0.1, 0.2, and 0.3% from the weight of cement are used in the tests. The results showed that the shrinkage occurred in amounts of 0.079, 0.062, 0.065, and 0.060 mm for the specimens containing calcium stearate of 0, 0.1, 0.2, and 0.3%, respectively. Moreover, we also perform shrinkage modelling to explore a possibility to incorporate the calcium stearate fraction into the standard concrete shrinkage model. There are three well-known shrinkage models used here, i.e., the Sakata, the Japan Standard and the Bazant-Baweja models, where only the latter one is capable to capture our experimental results very well for different fractions of calcium stearate.

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“…As razões são, entre outras, a possibilidade de melhoria nas propriedades desses compósitos, capacidade de imobilização do resíduo na matriz endurecida [7] e redução na utilização de matérias-primas associadas a altos índices de poluição em seus processos de produção, como é o caso do cimento Portland [8]. Estima-se que a produção do cimento seja a terceira maior fonte antropogênica de emissão de CO 2 [9], sendo responsável por até 8% da emissão global desse poluente e contribuindo para o agravamento da crise ambiental [10].…”

Section: Introductionunclassified

Utilização de lodo tratado de indústria de produtos de limpeza em matrizes cimentícias

et al. 2021

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RESUMO A geração de resíduos industriais tem aumentado continuamente motivando estudos sobre uma destinação ambientalmente correta e sustentável. Como exemplo existem os resíduos gerados em fábricas de produtos de limpeza. Com o intuito de avaliar o potencial de incorporação de lodo de uma indústria deste setor como filer para a fabricação de concretos convencionais, foram adicionados diferentes teores de lodo (5, 10, 15 e 20%) em um traço 1:2:3 (cimento:areia:brita). Foram avaliadas as propriedades mecânicas e de durabilidade destes concretos nos estados fresco e endurecido. Todos os concretos produzidos com o resíduo apresentaram aumento de trabalhabilidade atribuído à possível presença de surfactantes na composição dos efluentes. Entretanto, foram obtidas resistências à compressão inferiores ao concreto referência com evidências de um aumento na porosidade da zona de transição e maior formação do composto etringita na microestrutura. Para o máximo teor de adição, a redução na resistência foi cerca de 39%. A absorção de água e índice de vazios aumentaram levemente para todos as misturas, com exceção do concreto com 20% de lodo. A adição do resíduo na matriz cimentícia provocou uma redução na durabilidade. Como avaliação final, o teor máximo de adição recomendado é de 20%, constituindo uma proporção significativa para destinação do resíduo, entretanto, os concretos produzidos não podem ser utilizados para fins estruturais.

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Plant biomass ashes in cement-based building materials. Feasibility as eco-efficient structural mortars and grouts

Cited by 55 publications

References 142 publications

Valorisation of wood fly ash on concrete

Valorisation of wood fly ash on concrete

Drying Shrinkage of Concrete Containing Calcium Stearate, (Ca(C18H35O2)2), with Ordinary Portland Cement (OPC) as a Binder: Experimental and Modelling Studies

Utilização de lodo tratado de indústria de produtos de limpeza em matrizes cimentícias

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