Carbonation model for fly ash concrete based on artificial

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Carbonation model for fly ash concrete based on artificial ...

Jan 10, 2021  Artificial neural networks are used to predict carbonation in fly ash concrete. • ANN with two hidden layers can generate models with R 2 greater than 0.8.. The model proposed consider parameters considers parameters to be easily acquired.

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Carbonation model for fly ash concrete based on artificial ...

Artificial neural networks are used to predict carbonation in fly ash concrete. • ANN with two hidden layers can generate models with R 2 greater than 0.8. • The model proposed consider parameters considers parameters to be easily acquired. • Techniques based on machine learning can accurately predict carbonation results. •

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Service life prediction of fly ash concrete using an ...

Jun 25, 2021  10%  Carbonation is one of the most aggressive phenomena affecting reinforced concrete structures and causing their degradation over time. Once reinforcement is altered by carbonation, the structure will no longer fulfill service requirements. For this purpose, the present work estimates the lifetime of fly ash concrete by developing a carbonation depth prediction model that uses an artificial ...

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Exploring the major factors affecting fly-ash concrete ...

Exploring the major factors affecting fly-ash concrete carbonation using artificial neural network (2017).pdf. Content uploaded by Bakhta Boukhatem. ... 4 Parametrical analysis based on ANN model.

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Exploring the major factors affecting fly-ash concrete ...

Jun 19, 2017  10%  Carbonation depth in fly-ash concrete was predicted by considering the most influential factors as inputs in an artificial neural network (ANN) model. These factors were three concrete mix designs (water-to-binder ratio, binder and fly-ash content), two exposure conditions (CO 2 concentration and relative humidity), and age of exposure ( t ).

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Carbonation-Porosity-Strength Model for Fly Ash Concrete ...

Mar 25, 2002  The potential of a concrete for carbonation can be assessed effectively by measuring its carbonation depth using an accelerated carbonation testing. This paper reports the findings of a laboratory study including compressive strength, accelerated carbonation depth, and porosity properties of concrete mixtures made with fly ash and normal ...

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Exploring the major factors affecting fly-ash concrete ...

machine-learning-based model for carbonation behavior of fly-ash concrete. The application is based on the data obtained from past experimental studies on the accelerated carbonation of fly-ash ...

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(PDF) Service life prediction of fly ash concrete under ...

Jul 24, 2021  Service life prediction of fly ash concrete under the carbonation effect ... with combining both techniques of Artificial Neural Network and ... prediction model for concrete with fly ash.

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Exploring the major factors affecting fly-ash concrete ...

Exploring the major factors affecting fly-ash concrete carbonation using artificial neural network (2017).pdf. Content uploaded by Bakhta Boukhatem. ... 4 Parametrical analysis based on ANN model.

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Carbonation-Porosity-Strength Model for Fly Ash Concrete ...

Mar 25, 2002  The potential of a concrete for carbonation can be assessed effectively by measuring its carbonation depth using an accelerated carbonation testing. This paper reports the findings of a laboratory study including compressive strength, accelerated carbonation depth, and porosity properties of concrete mixtures made with fly ash and normal ...

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A model for predicting carbonation of high-volume fly ash ...

May 01, 2000  A mathematical model based on carbonation process for predicting the carbonation depth of high-volume fly ash (HVFA) concrete was developed. An accelerated carbonation test was conducted on ordinary Portland cement (OPC) concrete and HVFA concrete. The depths of carbonation predicted from the model are compared with the test results.

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Carbonation Test Study on Low Calcium Fly Ash Concrete ...

Making full use of fly ash (FA) is an important part of sustainable materials development in the word. This paper discussed the carbonation resistance of concrete with 10%, 20% and 25% fly ash replacement ratios(FA%). The process was accelerated in artificial carbonation laboratory by controlling 20% concentration of CO2, 10°C~30°C temperature and 50%~70% relative humidity(RH).

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Carbonation Depth Research of Concrete with Low-Volume Fly Ash

The use of fly ash is in harmony with the concept of sustainable development. This paper discusses the effect of replacing ratio of fly ash (FA), ambient relative humidity, temperature, curing age and w/c on carbonation of concrete made with low-volume FA. The process was accelerated in artificial carbonation laboratory by controlling 20% concentration of CO2, temperatures from 20°C to 60 °C ...

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Degradation of Concrete - by Miguel Tomás - Scientific ...

Dec 10, 2020  [95] A. Younsi et al, “Performance-based design and carbonation of concrete with high fly ash content”, Cement and Concrete Composites 2011, in press, corrected proof [96] Apedovi S. Kodjo et al, “Impact of the alkali-silica reaction products on slow dynamics behavior of concrete”, Cement and Concrete Research 2011(41), pp. 422-428

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Experimental Investigation of Neutralisation of Concrete ...

Jun 25, 2019  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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Comparative study of accelerated carbonation of plain ...

Mar 01, 2017  In a research by Atis [24], where cement was replaced by fly-ash by 50% and 70%, the depth of carbonation from accelerated carbonation was obtained for 2 weeks. Khunthongkeaw et al. [25] in their work have exposed the concrete samples to accelerated carbonation for 1 and 2 months. The replacement of cement by fly-ash was 10% and 30%.

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CARBONATION IN CONCRETE AND EFFECT ON STEEL

initiation of carbonation-induced corrosion may be shortened by -360% when the fly ash cement replacement is increased from 20% to 50%. The initiation time may be shortened by ;:35 when cement replacement is increased from 20% fly ash to 20% fly ash plus 8% silica fume. 17 KeyWardr Reinforcing Steel, Corrosion. Carbonation, Concrete,

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[PDF] Optimal Design of the Cement, Fly Ash, and Slag ...

In this study, we propose a simple approach to the optimal design of the fly ash and slag mixture in blended concrete that considers the carbon pricing, material cost, strength, workability, and carbonation durability. Firstly, the carbon pricing and the material cost are calculated based on the concrete

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Accelerated Carbonation Assessment of High-Volume Fly Ash ...

The issue of concrete carbonation has gained importance in recent years due to the increase use in supplementary cementing materials (SCMs) in concrete mixtures. While there is general agreement that concrete carbonation progresses at maximum at a relative humidity of about 60%, the rate may differ in the case of cements blended with SCMs, especially with high-volume fly ash replacements.

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Analysis of carbonation behavior in concrete using neural ...

Abstract Carbonation on concrete structures in underground sites or metropolitan cities is one of the major causes of steel corrosion in RC (Reinforced Concrete) structures. For quantitative evaluation of carbonation, physico-chemo modeling for reaction with dissolved CO 2 and hydrates is necessary. Amount of hydrates and CO 2 diffusion coefficient play an important role in evaluation of ...

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Model for Simulating Carbonation of Fly Ash Concrete ...

Oct 05, 2005  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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A study on carbonation depth prediction for fly ash concrete

A study on carbonation depth prediction for fly ash concrete. Carbonation of fly ash concrete is studied by using two types of fly ash with different CaO contents. It is observed that under natural exposure environments, the carbonation rate is the highest when specimens are exposed in the city.

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Carbonation Test Study on Low Calcium Fly Ash Concrete ...

Making full use of fly ash (FA) is an important part of sustainable materials development in the word. This paper discussed the carbonation resistance of concrete with 10%, 20% and 25% fly ash replacement ratios(FA%). The process was accelerated in artificial carbonation laboratory by controlling 20% concentration of CO2, 10°C~30°C temperature and 50%~70% relative humidity(RH).

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Algorithms to measure carbonation depth in concrete ...

The second algorithm is based on artificial intelligence, more specifically on an array of Kohonen networks, but also ... fly ash. Accelerated carbonation. Carbonation depth available. 4 (Xu et al. 2010) ... Algorithms to measure carbonation depth in concrete structures sprayed with a

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Estimated Service Life of Carbonation Exposed (Cracked ...

the preference as carrier concrete for incorporation of the healing agent in exposure class XC3. Keywords: High-Volume Fly Ash (HVFA) concrete, Self-healing concrete, Cracks, Carbonation, Service life. 1.0 INTRODUCTION Nowadays, more and more attention goes to a performance-based design of steel reinforced concrete structures.

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Evaluation of CO 2 emission–absorption of fly-ash-blended ...

Oct 28, 2014  Thus, in the present study, a method for measuring CO2 absorption by fly-ash-blended concrete structures using a carbonation model based on fly-ash-blended hydration was developed and evaluated. An apartment complex in which fly-ash-blended concrete was used is evaluated for its CO2 absorption by using the developed method in this study.

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Effect of CO 2 surface treatment on penetrability and ...

The study shows that if fly ash content is limited to 20% of cementitious material and carbonation curing duration is not to exceed 12 h, fly ash concrete can be produced with higher early ...

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Degradation of Concrete - by Miguel Tomás - Scientific ...

Dec 10, 2020  [95] A. Younsi et al, “Performance-based design and carbonation of concrete with high fly ash content”, Cement and Concrete Composites 2011, in press, corrected proof [96] Apedovi S. Kodjo et al, “Impact of the alkali-silica reaction products on slow dynamics behavior of concrete”, Cement and Concrete Research 2011(41), pp. 422-428

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Fly-Ash Concrete Scientific.Net

Abstract: This manuscript makes experiments on the relation between each index and fly-ash concrete strength, such as W/B, Sa, S/A and so on. At the same time we applicate artificial neural networks into HPFC The main research is on the relationship between component material and performance of the high-performance fly ash concrete, and also on the fly ash high-performance concrete quality ...

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Carbonation of Concrete Containing Mineral Admixtures ...

Apr 02, 2003  This study deals with the carbonation of concrete incorporating ground granulated blast-furnace slag (GGBS), fly ash (FA), and silica fume (SF). It is observed that a decreased water-to-binder ratio and replacement level of GGBS, FA, or SF, or an increase in GGBS fineness and curing age in water, led to better carbonation resistance.

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Investigation of the parameters influencing progress of ...

posed model was further employed to verify the fea - sibility of using this model as an intelligent tool for studying the progress of concrete carbonation and to explore the role of key input parameters on this time-dependent concrete durability problem. 2. METHODOLOGY 2.1. Data Acquisition and Preparation. The progress of carbonation front is ...

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Analysis of carbonation behavior in concrete using neural ...

Abstract Carbonation on concrete structures in underground sites or metropolitan cities is one of the major causes of steel corrosion in RC (Reinforced Concrete) structures. For quantitative evaluation of carbonation, physico-chemo modeling for reaction with dissolved CO 2 and hydrates is necessary. Amount of hydrates and CO 2 diffusion coefficient play an important role in evaluation of ...

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Effect of Blast Furnace Slag Powder and Fly Ash on ...

In this article, the usage of seawater as a material of concrete based on the results of experimental works and deterioration prediction was discussed. Especially, the effects of by-products such as blast furnace slag or fly ash on the durability of concrete mixed with seawater were evaluated. ... Artificial seawater, designed according to ...

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