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a study on carbonation depth prediction for fly ash concrete

A study on carbonation depth prediction for fly ash

Nov 01, 2006· However, for the mixtures with 50% fly ash, the carbonation coefficients of mortar are much higher than those of the concrete. This finding suggests that the carbonation test of mortars provides worse result of the use of fly ash than that of concrete specimens when cement is replaced by fly ash at high content (50%).

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A study on carbonation depth prediction for fly ash

A study on carbonation depth prediction for fly ash concrete. when compared at an equal strength, the effect of the type of fly ash on carbonation becomes insignificant. When comparing the carbonation results of concrete and mortar specimens, results of mortar show similar trends as those of concrete. the test results on mortar are

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A study on carbonation depth prediction for fly ash

Request PDF 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

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A study on carbonation depth prediction for fly ash

Request PDF On Jan 1, 2009, J. Khunthongkeaw and others published A study on carbonation depth prediction for fly ash concrete Find, read and cite all the research you need on ResearchGate

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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 Depth Model and Prediction of Hybrid Fiber Fly

Research Article Carbonation Depth Model and Prediction of Hybrid Fiber Fly Ash Concrete Jing-shuang Zhang ,1,2 Meng Cheng,1,2 and Jian-hua Zhu1,2 1Engineering Research Center of Underground Mine Construction, Ministry of Education, Anhui University of

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Prediction of Carbonation Depth of Concrete With Fly Ash

Depth of carbonation can be evaluated by compressive strength of concrete cured in water for 28 days, irrespective of the fly ash content of concrete. Carbonation depth of concrete with and without fly ash naturally exposed indoors can be predicted by the equation obtained by the accelerated carbonation

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Carbonation Depth Model and Prediction of Hybrid Fiber Fly

The average increase rate of carbonation depth of concrete with various fly ash contents at 3 d, 7 d, 14 d, and 28 d can be obtained; compared with concrete without fly ash, the average increase rate of carbonation depth of concrete with fly ash contents of 5%, 10%, 20%, and 30% is 6.4%, 14.9%, 59.8%, and 73.5%.

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Model for practical carbonation depth prediction for high

The main objective of this study was to evaluate the application of widely used models for carbonation depth prediction—defined for ordinary Portland cement concrete with natural aggregate (NAC)—to high volume FA concrete (HVFAC) and recycled aggregate concrete (RAC). The research presented in this paper was conducted in two steps.

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Deep Learning Modelling and Generalisation of Carbonation

Dec 21, 2020· An accurate concrete carbonation predictive model is needed to ensure effective structural health monitoring of concrete, as a result of nonlinear behaviour of concrete carbonation and uncertainties of environmental factors affecting the progress of carbonation. In reality, the performance of a developed predictive model lies on its ability to accurately generalise (simulate) the input

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Carbonation Depth Model and Prediction of Hybrid Fiber

Research Article Carbonation Depth Model and Prediction of Hybrid Fiber Fly Ash Concrete Jing-shuang Zhang ,1,2 Meng Cheng,1,2 and Jian-hua Zhu1,2 1Engineering Research Center of Underground Mine Construction, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, Anhui, China

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Experimental study on the carbonation of fly ash concrete

Based on fly ash concrete carbonation test, the impacts of water-binder ratio, fly ash proportion and pouring side to concrete carbonation depths was studied. With the help of the influence coefficient K<sub>s</sub> of steel bar existence, the carbonation situations of concrete specimen with steel bar existence are analysed. The research results indicate that steel bar

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A model for predicting the carbonation depth of concrete

Carbonation of cement blended with fly ash is much more complex than ordinary Portland cement because of the pozzolanic activity in an aluminosilicate glass phase of fly ash. In this paper, based on multi-component concept, a numerical model that can predict carbonation of low-calcium fly ash contained concrete was built.

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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

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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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(PDF) INTELLIGENT PREDICTION OF CONCRETE CARBONATION DEPTH

Table 1 .1Groups of factors influencing concrete carbonation and relevant input parameters belonging to these groups that are used in this study.Influencing Factors Relevant Input Parameters Group-1 Cement Composition 4 parameters= CaO, SiO2, Fe2O3, Al2O3 contents Group-2 Fly Ash Composition 4 parameters= CaO, SiO2, Fe2O3, Al2O3 contents Group

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Model for practical carbonation depth prediction for high

The main objective of this study was to evaluate the application of widely used models for carbonation depth prediction—defined for ordinary Portland cement concrete with natural aggregate (NAC)—to high volume FA concrete (HVFAC) and recycled aggregate concrete (RAC). The research presented in this paper was conducted in two steps.

More

Deep Learning Modelling and Generalisation of Carbonation

Dec 21, 2020· An accurate concrete carbonation predictive model is needed to ensure effective structural health monitoring of concrete, as a result of nonlinear behaviour of concrete carbonation and uncertainties of environmental factors affecting the progress of carbonation. In reality, the performance of a developed predictive model lies on its ability to accurately

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Carbonation Test Study on Low Calcium Fly Ash Concrete CORE

The depth of carbonation could be observed by spraying phenolphthalein solution on the fresh broken concrete surface. The test results show that adding fly ash into concrete results in the decrease of cement consumption and calcium hydroxide, so carbonation rate increases.

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Performance Based Evaluation of Carbonation Resistance of

Dec 07, 2017· A study on carbonation depth prediction for fly ash concrete. Construction and Building Materials, 20 (9), 744–753. Article Google Scholar

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PAPER OPEN ACCESS Related content A review on

Hence it was found that carbonation depth is directly proportional to water/binder ratio[11]. Slump values also had a tremendous impact on carbonation depth, increase in slump increases depth of carbonation. Fly Ash (FA) has also had a greater effect on carbonation depth and strength of concrete. High levels of

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Carbonation-Porosity-Strength Model for Fly Ash Concrete

Mar 25, 2002· The study involves two replacement ratios of fly ash, various water-to-cement ratios, use of superplasticizer, two curing conditions, and four concrete ages. Statistical models that relate accelerated carbonation depth to strength and porosity are presented.

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Carbonation of fly ash concrete: laboratory and field data

The present study consists of investigating the carbonation resistance of two series of concrete mixtures designed for three classes of concrete (25, 35, and 45 MPa compressive strength at 28 d) and using American Society for Testing and Materials (ASTM) type I Portland cement and two commercially used fly ashes meeting the ASTM standards at the level of 20%, 35%, and 50%

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Study on Carbonation Resistance of High-Performance

Based on the mechanism of concrete carbonation, the effects of content of fly ash in the binder, the water to binder ratios, compound activator, and long-term curing on the carbonation depth of fly ash high-performance concrete are investigated. Experiment results are analyzed and compared with compressive strength development characteristic of fly ash high-performance concrete

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