Diffusivity of Binary and Ternary Concrete Mixture Blends

Burris, Lisa E.; Riding, Kyle A.

doi:10.14359/51686826

Cited by 10 publications

(9 citation statements)

References 21 publications

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“…Based on the modeled electrical resistivity measurements, the apparent and 28-day diffusion coefficients were calculated and utilized for service life estimations in Life-365, a life-cycle assessment software for concrete structures demonstrated in the literature ( 18 ). The definition of service life used in this study is the time until the initiation of corrosion of embedded steel reinforcement.…”

Section: Discussionmentioning

confidence: 99%

“…where D 28 is the normalized value of the diffusion coefficient after 28 days of curing, D a (t) is the apparent diffusion coefficient at time t, t is the curing time in days, and m is the decay coefficient based on concrete composition. The decay coefficients used in this work were derived by Burris and Riding (18) and are based on the contribution of supplementary cementitious materials to long-term chloride diffusion. Two electrically accelerated test methods have been developed to evaluate chloride migration in concrete and are in common-use: steady-state charged, NT Build 355, and non-steady-state charged, NordTest Build 492 (19,20).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Chloride Intrusion along Concrete–Grout Interfaces for Post-Tensioned Concrete Durability

Tatum

Colbert

Brenkus

2021

Transportation Research Record

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A pour-back is a critical component of a post-tensioned concrete system, affecting its durability by protecting anchorages and vents from corrosion. However, the material interface between the grout pour-back and the concrete member may serve as an accelerated pathway for chloride ion intrusion and may lead to premature corrosion of post-tensioning components. This study evaluates the vulnerability of concrete–grout interfaces through two experimental protocols: a novel electrical migration test and the standard electrical resistivity test. The results are used to predict the service life of pour-back systems using a concrete life-cycle assessment model. This research serves as a first step toward defining the chloride permeability of concrete–grout interfaces.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Chloride Intrusion along Concrete–Grout Interfaces for Post-Tensioned Concrete Durability

Tatum

Colbert

Brenkus

2021

Transportation Research Record

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“…Since silica has adequate time to react with calcium hydroxide produced by the hydration of the cement (Chowdhury et al, 2015), the replacement of the cement with enough nanosilica may consume the paste CH through an early pozzolanic reaction between CH and surface of nanosilica to form C-S-H seeds, thus significantly lowering the diffusivity (Burris and Riding, 2014). According to this hypothesis, with a higher amount of nanosilica, a suffi cient amount of the generated C-S-H seeds enables the growth of the hydration products on their surfaces and results in the formation of a dense C-S-H gel (Birgisson et al, 2012).…”

Section: Eksperimentalni Rezultatimentioning

confidence: 99%

Performance of ANN in Predicting Internal Bonding of Cement Particleboard Manufactured from Giant Reed and Bagasse

et al. 2021

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The present article investigates the microstructure of the cement matrices and the products of cement hydration by means of scanning electron microscopy, Fourier transform infrared spectroscopy and X-Ray diffraction. Then, the internal bonding strength (IB) is measured for the mixtures containing various amounts of nanosilica (NS), reed and bagasse particles. Finally, an Artificial Neural Network (ANN) is trained to reproduce these experimental results. The results show that the hardened cement paste including NS features the highest level of C-S-H. However, it has a lower level of C-S-H polymerization if reed or bagasse particles are applied. A relatively new dense microstructural degree is considered in the cement pastes containing NS, and a lower agglomeration is observed in the samples including reed or bagasse particles with NS. According to the microstructural analysis, the addition of NS to the samples containing reed or bagasse particles increases the unhydrated amount of C2S and C3S in the cement paste due to the decrease in the water needed for fully hydrated cement grains through portlandite (Ca(OH)2), C-S-H and ettringite increase. Besides, it is shown that the ANN prediction model is a useful, reliable and quite effective tool for modeling IB of cement-bonded particleboard (CBPB). It is indicated that the mean absolute percentage errors (MAPE) are 1.98 % and 1.45 % in the prediction of the IB values for the training and testing datasets, respectively. The determination coeffi cients (R2) of the training and testing data sets are 0.972 and 0.997 in the prediction of the bonding strength by ANN, respectively.

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“…While the literature is full of data on the concrete apparent diffusion coefficient for different mixtures, there is scant data on the effective chloride diffusion coefficient in concrete after chloride binding has been separated [10,11].…”

Section: Introductionmentioning

confidence: 99%

Field Validation of Concrete Transport Property Measurement Methods

et al. 2020

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Reinforcing steel corrosion, caused by chloride ingress into concrete, is the leading cause of reinforced concrete deterioration. One of the main findings in the literature for reducing chloride ingress is the improvement of the durability characteristics of concrete by the addition of supplementary cementitious materials (SCMs) and/or chemical agents to concrete mixtures. In this study, standard ASTM tests—such as rapid chloride permeability (RCPT), bulk diffusion and sorptivity tests—were used to measure concrete properties such as porosity, sorptivity, salt diffusion, and permeability. Eight different mixtures, prepared with different SCMs and corrosion inhibitors, were tested. Apparent and effective chloride diffusion coefficients were calculated using bound chloride isotherms and time-dependent decrease in diffusion. Diffusion coefficients decreased with time, especially with the addition of SCMs and corrosion inhibitors. The apparent diffusion coefficient calculated using the error function was slightly lower than the effective diffusion coefficient; however, there was a linear trend between the two. The formation factor was found to correlate with the effective diffusion coefficient. The results of the laboratory tests were compared and benchmarked to their counterparts in the marine exposure site in the Arabian Gulf in order to identify laboratory key tests to predict concrete durability. The overall performance of concrete containing SCMs, especially fly ash, were the best among the other mixtures in the laboratory and the field.

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Diffusivity of Binary and Ternary Concrete Mixture Blends

Cited by 10 publications

References 21 publications

Evaluation of Chloride Intrusion along Concrete–Grout Interfaces for Post-Tensioned Concrete Durability

Evaluation of Chloride Intrusion along Concrete–Grout Interfaces for Post-Tensioned Concrete Durability

Performance of ANN in Predicting Internal Bonding of Cement Particleboard Manufactured from Giant Reed and Bagasse

Field Validation of Concrete Transport Property Measurement Methods

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