Biphasic carbonation behaviour of structural lightweight aggregate concrete produced with different types of binder

Bogas, José Alexandre; Real, Sofia; Ferrer, Beatriz

doi:10.1016/j.cemconcomp.2016.05.006

Cited by 29 publications

(26 citation statements)

References 22 publications

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“…It can therefore be concluded that the effect of fly ash on the course of carbonation consists of two opposite effects: • accelerating -associated with the deficiency of Ca(OH) 2 used for the pozzolanic reaction, whose carbon dioxide diffuses is "searching" deeper in the concrete; • inhibitory -associated with the structure sealing by fine grain ash and additional pozzolanic reaction products. The results of the published studies do not resolve unequivocally [10], which effect is dominating. It depends on the interaction of ingredients and external factors, however, one of the most important factors is curing.…”

Section: Modification Of Concrete With Fly Ash and A Carbonation Of Cmentioning

confidence: 44%

Calcarreous Fly Ash Content Signifacence To Self-Terminating Carbonation Model Of Concrete

2018

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Abstract. Calcareous Ely Ash is a combustion by-product of Brown coal. Its technical properties depend on the combustion conditions -in the paper calcareous fly ash obtained from the traditional grate furnaces is considered. The presented paper shows the results of accelerated carbonation tests according to the draft of CEN / TS 12390-12 standard. The obtained models have self-terminating character. Concretes of water to cement ratio (w / c) from 0,35 to 0,55 and Ely Ash to cement ratio (p / c) from 0,2 to 0,5 were investigated.

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Section: Modification Of Concrete With Fly Ash and A Carbonation Of Cmentioning

confidence: 44%

Calcarreous Fly Ash Content Signifacence To Self-Terminating Carbonation Model Of Concrete

2018

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“…In order to study the effect of different SCMs on the carbonization resistance of LWAC, Bogas [30] selected silica fume (SF), fly ash (FA), and lime powder in a lab experiment to compare the results through accelerated carbonization process. In this study, four types of lightweight aggregates were used to prepare LWAC samples, two of which were from Portuguese expanded clay aggregates, one from the United Kingdom sintered fly ash aggregate, and one from the United States expanded slate aggregate.…”

Section: Recycling Materials As Cementitious Bindersmentioning

confidence: 99%

“…Using OPS as LWA to fabricate concrete was first studied in 1985 by Abdullah in Malaysia [44]. Some researchers investigated the OPS concrete, and the results showed that, in most cases, the compressive strength of OPS (4.75-9.5 mm) lightweight concrete is higher than that of the structural lightweight concrete (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35), and the density is about 20-25% lower than normal-weight concrete [45][46][47][48]. Recent studies have shown that the probability of producing high compressive strength OPS lightweight concrete is up to 53 and 56 MPa in 28 and 56 d respectively [49].…”

Section: Agricultural Wastementioning

confidence: 99%

Green and Durable Lightweight Aggregate Concrete: The Role of Waste and Recycled Materials

et al. 2020

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Lightweight aggregate concrete manufactured by solid waste or recycled by-products is a burgeoning topic in construction and building materials. It has significant merits in mitigating the negative impact on the environment during the manufacturing of Portland cement and reduces the consumption of natural resources. In this review article, the agricultural and industrial wastes and by-products, which were used as cementitious materials and artificial lightweight aggregate concrete, are summarized. Besides, the mechanical properties, durability, and a few advanced microstructure characterization methods were reviewed as well. This review also provides a look to the future research trends that may help address the challenges or further enhance the environmental benefits of lightweight aggregate concrete manufactured with solid waste and recycled by-products.

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“…(2018) [20], and many others. However, during the last few years there have been only a few publications concerning the carbonation of concrete containing high-calcium fly ash as an additive [21,22,23,24,25,26].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Carbonation Progress in Concrete Containing Calcareous Fly Ash Co-Binder

2019

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According to the European Standards (EN 450-1, EN 206), it is not permissible to use calcareous fly ash as an additive to concrete. However, other standards (for example, the American and Canadian ones) allow the use of high-calcium fly ash (type C) in concrete. As a result of brown coal combustion, a large amount of this type of fly ash is produced, and considerations on their use in concrete are in progress. Research into the influence of high-calcium fly ash on concrete durability is fundamental for dealing with that issue. The aim of the present research was to develop a new model of carbonation over time, also including calcareous fly ash content in the binder. The self-terminating model of carbonation is new, and not developed by other authors. In the current research, the former simplest model (a function of w/c ratio and time) is expanded with the calcareous fly ash to cement ratio. The basis is a statistically planned experiment with a large scope of two material variables (w/c ratio and fly ash to cement ratio). The main measured property is the carbonation depth after exposure to 4% of CO2 concentration (according to CEN/TS 12390-12). The model of carbonation obtained from this experiment is an output of the paper. Also, the idea of developing similar models for concrete families as a tool for designing concrete cover thickness for reinforced elements is described in the paper.

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Biphasic carbonation behaviour of structural lightweight aggregate concrete produced with different types of binder

Cited by 29 publications

References 22 publications

Calcarreous Fly Ash Content Signifacence To Self-Terminating Carbonation Model Of Concrete

Calcarreous Fly Ash Content Signifacence To Self-Terminating Carbonation Model Of Concrete

Green and Durable Lightweight Aggregate Concrete: The Role of Waste and Recycled Materials

Prediction of Carbonation Progress in Concrete Containing Calcareous Fly Ash Co-Binder

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