carbonation of fly ash concrete investigated with

Carbonation of Fly Ash Concrete Investigated with ...

This paper presents the carbonation of fly ash concrete investigated with microhardness analysis.After fly ash concrete specimens are exposed in accelerated carbonation environment for 7 d and 28 d,the concrete plate about 50 mm thick is split from the specimen and the cross section is sprayed with phenolphthalein solution to measure carbonation depth.A slice about size of 70 mm×50 mm×5 mm ...

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Carbonation performance of concrete with fly ash as fine ...

2020-5-10  To solve this problem, some researchers have investigated the use of fly ash as part substitution for fine aggregate in concrete. Concrete with fly ash as fine aggregate (CFA) indicates that in the process of concrete production, a certain amount of sand is substituted with fly ash, whereas the content of cement remains unchanged.

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Carbonation of Fly Ash Concrete

2000-4-1  The results show that the carbonation of concrete with 15% to 30% fly ash is similar to or slightly higher than equivalent strength concrete without fly ash. Concrete containing 50% fly ash carbonated at a significantly faster rate than control specimens of the same grade and the differences were particularly marked for poorly cured concretes.

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Carbonation of fly ash concrete Magazine of Concrete ...

2015-5-25  The carbonation of fly ash concrete is reported, with particular emphasis on the role of curing. Concretes with nominal strength grades C25, C35 and C45 and a range of fly ash levels (0–50%) were exposed to various treatments during the first 28 days; i.e. different moist curing periods anda range of ambient temperatures and relative humidities after curing.

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Carbonation of Fly Ash Concrete and Micro-Hardness ...

The effects of carbonation age, fly ash content in the binder and the water to binder ratios on the carbonation depth of fly ash concrete is investigated and the micromechanical properties of the hardened paste and the inter facial transition zone is analyzed with the micro-hardness method.

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Performance-based design and carbonation of concrete with ...

2011-11-1  This paper reports on an investigation of the durability of high-volume fly ash concrete exposed to carbonation (XC class in EN 206-1 Standard). The reduction of cement content is assumed to mitigate CO 2 emissions due to the production of Portland cement clinker. The durability of concrete is assessed through a performance-based approach.

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Carbonation performance of concrete with fly ash as fine ...

Results show that the carbonation depth of concrete increases with the increase in the initial stress damage and carbonation time. In addition, compared with ordinary concrete, substituting fine aggregate with fly ash can enhance the carbonation resistance of concrete. High temperature has a noticeable deterioration effect on the neutralization ...

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Carbonation of Concrete Incorporating High Volumes of Fly Ash

2006-3-22  The depth of carbonation in concrete was also found to significantly depend on the reactivity of fly ash used; in general, the depth of carbonation deceased with increasing fly ash reactivity. The carbonation results on concrete exposed to natural environment show that the depth of carbonation of HVFA concretes exposed to outdoor environment for seven years ranged from 3.5 to 7.5 mm, and that of the control concrete

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Model for Simulating Carbonation of Fly Ash Concrete ...

The aim of this paper is to develop a model for simulating carbonation of fly ash concrete. The model describes the diffusion of gases (C O 2 and water vapor) in concrete by the mass balance equations and the Fick’s law of diffusion.

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Carbonation of concrete

2016-11-11  unwanted properties, such as increased carbonation and reduced strength. Hence, durability is in some aspects improved, while in other reduced. This study investigated how mineral addition influences carbonation, and how carbonation affects chloride migration and transport properties in

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Carbonation of Fly Ash Concrete and Micro-Hardness ...

The effects of carbonation age, fly ash content in the binder and the water to binder ratios on the carbonation depth of fly ash concrete is investigated and the micromechanical properties of the hardened paste and the inter facial transition zone is analyzed with the micro-hardness method. The experimental results show that replacing Portland cement in concrete with fly ash increases the ...

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Experimental Research on Accelerated Carbonation of ...

The effect of water to binder ratio,fly ash and slag on the carbonation of concrete is investigated with low-concentration(3% CO2 in volume) carbonation test me

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Carbonation of fly ash concrete : laboratory and field ...

Made available by U.S. Department of Energy Office of Scientific and Technical Information ...

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Performance-based design and carbonation of concrete

2021-5-10  and carbonation of concrete with high fly ash content. Cement and Concrete Composites, Elsevier, ... was investigated, namely the carbonation kinetics. They were as-sessed by means of accelerated carbonation tests carried out at 20 ± 2 C and 65

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Model for Simulating Carbonation of Fly Ash Concrete ...

The aim of this paper is to develop a model for simulating carbonation of fly ash concrete. The model describes the diffusion of gases (C O 2 and water vapor) in concrete by the mass balance equations and the Fick’s law of diffusion.The time dependent hydration, and pozzolanic and carbonation reactions were considered for evaluating the amount of calcium hydroxide in concrete.

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Model for Simulating Carbonation of Fly Ash Concrete

Model for Simulating Carbonation of Fly Ash Concrete. The aim of this paper is to develop a model for simulating carbonation of fly ash concrete. The model describes the diffusion of gases and water in concrete by the mass balance equations and the Fick's law of diffusion.

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Carbonation of concrete

2016-11-11  2.5.1 Carbonation of fly ash concretes 13 2.5.2 Carbonation of GGBS concretes 13 2.6 Chloride ingress and chloride induced corrosion 14 2.7 Relation between chloride ingress and carbonation 15 2.8 Accelerated carbonation 15 2.9 Concrete standards in Sweden and Europe 16 2.9.1 The k-value concept for fly ash and GGBS 17

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1D and 2D carbonation of fly ash concrete under flexural ...

flow of concrete under flexural stress is developed in this paper.Using this method,1D and 2D stress-carbonation depth at different carbonation age were systematically investigated for fly ash concretes made of different cement replacement percentage ...

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Experimental Investigation of Neutralisation of Concrete ...

2019-6-25  To study the durability of concrete with fly ash as fine aggregate under alternate freeze-thaw and carbonation, freeze-thaw and carbonation cyclic tests are conducted to explore variation characteristics such as relative dynamic modulus of elasticity and neutralisation depth. The influence coefficient ( λ C ) of carbonation on concrete freeze-thaw damage and the influence coefficient (# ...

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Carbonation of autoclaved aerated concrete containing fly ash

2018-9-1  The maximum drying shrinkage value of product C containing fly ash was about 0.65 mm/m, whereas product B without fly ash showed a typical maximum shrinkage value of 0.25 mm/m. The correlation of both results may suggest that products with unfavorable shrinkage behavior tend to have a minor resistance against carbonation.

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Experimental Research on Accelerated Carbonation of ...

The effect of water to binder ratio,fly ash and slag on the carbonation of concrete is investigated with low-concentration(3% CO2 in volume) carbonation test me

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Performance-based design and carbonation of concrete

2021-5-10  and carbonation of concrete with high fly ash content. Cement and Concrete Composites, Elsevier, ... was investigated, namely the carbonation kinetics. They were as-sessed by means of accelerated carbonation tests carried out at 20 ± 2 C and 65

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Model for Simulating Carbonation of Fly Ash Concrete

Model for Simulating Carbonation of Fly Ash Concrete. The aim of this paper is to develop a model for simulating carbonation of fly ash concrete. The model describes the diffusion of gases and water in concrete by the mass balance equations and the Fick's law of diffusion.

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Carbonation performance of concrete with fly ash as fine ...

Results show that the carbonation depth of concrete increases with the increase in the initial stress damage and carbonation time. In addition, compared with ordinary concrete, substituting fine aggregate with fly ash can enhance the carbonation resistance of concrete. High temperature has a noticeable deterioration effect on the neutralization ...

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Accelerated and natural carbonation of concrete with high ...

2019-1-16  1. Introduction. Fly ash (FA) already has a long history of being used as partial replacement of ordinary Portland cement (OPC) in concrete. When focusing on high-volume fly ash (HVFA) concrete, special attention should go to environments subject to atmospheric CO 2 ingress and carbonation-induced steel corrosion. In OPC concrete, CO 2 dissolves in the pore solution to form carbonic acid

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Carbonation of autoclaved aerated concrete containing fly ash

2018-9-1  The maximum drying shrinkage value of product C containing fly ash was about 0.65 mm/m, whereas product B without fly ash showed a typical maximum shrinkage value of 0.25 mm/m. The correlation of both results may suggest that products with unfavorable shrinkage behavior tend to have a minor resistance against carbonation.

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Carbonation of high-calcium fly ashes and its potential ...

2020-8-24  plants. In this study, mineral carbonation of high–calcium fly ash is investigated under dry and moist conditions in a continuous flow reactor during up to 2 hours, at temperatures ranging from 160 to 290 ºC and CO 2 pressures between 1 and 6 bar. A comprehensive charaterization of treated and untreated samples

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Concrete Carbonation and Chloride Resistance Under

2019-4-8  Li, Yuan, et al. (2011) studied the carbonation of fly ash concrete cured in 20, 30, and 40°C water for 3, 7, 14, and 28 days, respectively, and found that prolonging initial curing time and increasing curing temperature is beneficial for concrete carbonation resistance. For the same curing conditions, carbonation rate of fly

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Prediction of Carbonation Progress in Concrete Containing ...

After carbonation in concrete with a low w/c ratio , there are still many fly ash grains, which are not involved in the carbonation process. In the case of w/c = 0.52 after carbonation, fewer fly ash particles and portlandite crystals were visible due to the generally higher homogeneity of the microstructure.

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Carbonation curing of industrial solid waste-based aerated ...

Aerated concrete with red mud showed the highest CO2 uptake capacity, followed by concrete with fly ash, and concrete with blast furnace slag. The main crystalline carbonation products, needle-like calcite and rod-like aragonite, were observed to be embedded in the surface of fly ash and blast-furnace-slag-based specimens.

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