Microconcrete with partial replacement of Portland cement by fly ash and hydrated lime addition

Lorca, P.; Calabuig, Rafael; Benlloch, J.; Soriano, Lourdes; Payá, J.

doi:10.1016/j.matdes.2014.08.022

Cited by 34 publications

(20 citation statements)

References 19 publications

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“…Lime fixation increased with the SCBA percentage and for the highest OPC replacement (OPC/SCBA50%) there was remaining portlandite. When comparing this result with the reported lime fixation in similar OPC/fly ash mixtures (36), it can be concluded that the pozzolanic reactivity of the studied SCBA was lower than that found for fly ashes. The highest value of lime consumption for SCBA pastes was 0.19, found for the OPC/SCBA25% mixture, suggesting that the optimum replacement percentage would be in the 20-30% range.…”

Section: Ftir Tga Frattini and Sem Studiessupporting

confidence: 48%

Valorisation of sugarcane bagasse ash (SCBA) with high quartz content as pozzolanic material in Portland cement mixtures

Pereira

Moraes

et al. 2018

Mater. construcc.

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Portland cement (OPC) production is one of the most contaminating greenhouse gas producing activities. In order to reduce OPC consumption, several alternatives are being assessed, and the use of pozzolanic material is one of them. This paper presents study on the reactivity of sugarcane bagasse ash (SCBA), a residue from sugarcane industry, as a pozzolanic material. In order to evaluate SCBA reactivity, it was mixed in pastes with hydrated lime and OPC, which were microstructurally characterised. These studies showed that SCBA presents some pozzolanic characteristics. Studies on mortars in which OPC was replaced by SCBA in the range 10-30% were also carried out. Replacement in the range 15-20% yielded the best behaviour in terms of compressive strength. Finally, it can be concluded this ash could be valorised despite its relative low pozzolanic reactivity. RESUMEN: Valorización de la ceniza de bagazo de azúcar (SCBA) con alto contenido de cuarzo como material puzolánico en mezclas de cementoPortland. La producción de cemento Portland (OPC) presenta una elevada emisión de CO 2 . Con el objeto de reducir el consumo de OPC, se están evaluando algunas alternativas, y el uso de materiales puzolánicos es una de ellas. En este trabajo se presenta el estudio de la reactividad de la ceniza de bagazo de caña de azúcar (SCBA) como material puzolánico, un residuo procedente de la industria de la caña de azúcar. Al objeto de evaluar la reactividad de SCBA, se realizaron pastas con cal hidratada y con OPC, las cuales fueron caracterizadas microestructuralmente. Estos estudios mostraron que SCBA presenta una cierta característica puzolánica. Se llevaron a cabo estudios en morteros en los que OPC se sustituyó por SCBA en el intervalo de 10-30%. La sustitución en el intervalo 15-20% produjo el mejor comportamiento en términos de resistencia a compresión. Finalmente, se puede concluir que esta ceniza puede ser valorizada a pesar de su baja reactividad puzolánica.

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Section: Ftir Tga Frattini and Sem Studiessupporting

confidence: 48%

Valorisation of sugarcane bagasse ash (SCBA) with high quartz content as pozzolanic material in Portland cement mixtures

Pereira

Moraes

et al. 2018

Mater. construcc.

Self Cite

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“…Studies of content of Ca(OH) 2 , based on TG/DTG results, have allowed the authors to state that the reactivity of fly ash is enhancement with addition of the hydroxide and as result of it 28-day compressive strength is improved. Similarly, Lorca et al [86] presented that introduction of Ca(OH) 2 into concrete containing 50 or 70% of low-calcium fly ash as cement replacement results in improvement in compressive strength starting from 7th day of hardening. Thermal analysis after 1 year of hardening revealed the absence of Ca(OH) 2 in high and very high volume fly ash concretes.…”

Section: Mechanical Activationmentioning

confidence: 98%

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Wilińska

Pacewska

2018

J Therm Anal Calorim

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Binders containing fly ash as cement substitute have been used for many years. Typical amount of fly ash in cement composite does not exceed 35% of mass of binder. Replacement of substantial amount of cement mass by fly ash results in retardation of hydration of binder and deterioration of some concrete properties, e.g. delay in setting time and reduction in early compressive strength. These inconveniences may be reduced using proper method of activation. In this paper, possibilities to activate binding mixtures containing high and very high amount of fly ash and low amount of Portland cement were discussed basing on the literature reports as well as on our own research results. Several activating methods were described, such as mechanical activation, exchanging of part of components of binder (cement, fly ash or both of them) by more reactive fine-grained material, chemical activation by the use of alkaline activators as well as combined methods. Possibilities of using these methods were discussed in relation to amount of fly ash introduced as replacement of cement and kind of fly ash used. Usefulness of calorimetry and thermal analysis methods was also presented.

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“…Aggressive efforts have been undertaken recently to recycle fly ash [13][14][15][16][17] in concrete production as mineral admixture, soil amendment, zeolite synthesis, and as filler in polymers. However, these applications are not sufficient for complete utilization of fly ash, thereby it is imperative to develop new recycling techniques for fly ash.…”

Section: Introductionmentioning

confidence: 99%

An investigation of the microstructure and durability of a fluidized bed fly ash–metakaolin geopolymer after heat and acid exposure

et al. 2015

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Microconcrete with partial replacement of Portland cement by fly ash and hydrated lime addition

Cited by 34 publications

References 19 publications

Valorisation of sugarcane bagasse ash (SCBA) with high quartz content as pozzolanic material in Portland cement mixtures

Valorisation of sugarcane bagasse ash (SCBA) with high quartz content as pozzolanic material in Portland cement mixtures

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

An investigation of the microstructure and durability of a fluidized bed fly ash–metakaolin geopolymer after heat and acid exposure

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