Extension of Powers-Brownyard Model to Pastes Containing Supplementary Cementitious Materials

Glosser, Deborah; Azad, Vahid Jafari; Suraneni, Prannoy; Isgor, O. Burkan; Weiss, Jason

doi:10.14359/51714466

Cited by 19 publications

(13 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Theoretical approaches to calculate concrete resistivity also exist using models that describe the pore structure [42][43][44][45], but these models may require some empirical approximations. While it will not be described here due to space limits, the pore partitioning model is currently being examined as a way to provide a direct calculation of resistivity that would enable the model to come closer to self-sufficient [46,47]. Therefore, this paper assumes that concrete resistivity is one of the only measured input parameters for the proposed modelling approach.…”

Section: Determination Of the Formation Factormentioning

confidence: 99%

A nearly self-sufficient framework for modelling reactive-transport processes in concrete

Isgor

Weiss

2018

Mater Struct

Self Cite

View full text Add to dashboard Cite

This paper describes a multi-species and multi-mechanism reactive-transport modelling framework for concrete. This modelling framework has the potential to be used in conjunction with performance specifications currently being developed in the US. The modelling framework is 'nearly' self-sufficient as it enables electrical resistivity to be used as the main physically measured input parameter in the simulations. The model uses thermodynamic calculations to predict pore solution composition, pore solution resistivity, pore volumes, and reactions between the solid and ionic components of the cementitious matrix such as chloride binding. The measured electrical resistivity is normalized by the calculated pore solution resistivity to compute the formation factor, which is used to predict transport properties of the ionic species. The framework allows the solution of reactive-transport equations with minimal input data to assess ionic movement, chloride ingress, and time to corrosion.

show abstract

Section: Determination Of the Formation Factormentioning

confidence: 99%

A nearly self-sufficient framework for modelling reactive-transport processes in concrete

Isgor

Weiss

2018

Mater Struct

Self Cite

View full text Add to dashboard Cite

show abstract

“…The pore partitioning model (PPM) [24], which synergistically combines thermodynamic calculations with the Powers-Brownyard model [25], to determine the amount of gel water and capillary water in the studied mixtures systems.…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

“…2, although more straetlingite is proposed in place of gibbsite. The GEMS results were then used as input in the pore partitioning model [24] to calculate the volume fractions of unreacted binder, gel solids, gel water, capillary water, and chemical shrinkage. These results are shown in Fig.…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

Factors Influencing the Electrical Properties of Ettringite Binders as Repair Materials

Tuinukuafe

Noor²,

Ideker³

et al. 2022

MATEC Web Conf.

Self Cite

View full text Add to dashboard Cite

Ettringite binders are increasingly being used as rapid-repair materials to extend the service-life of reinforced concrete where rebar corrosion has caused deterioration and spalling. The transport properties of these ettringite binders are important in assessing the longevity of such repairs. This study demonstrates how the electrical properties of such binders can be interpreted to obtain meaningful results related to the transport properties. In addition to the pore solution chemistry, the degree of saturation in calcium sulfoaluminate (CSA) cement was found to be an important factor in the electrical properties since ettringite binders can have greater self-desiccation at earlier ages than ordinary portland cement (OPC). After one day of hydration, the electrical properties suggested that the CSA containing mixtures had greater pore network connectivity than the OPC mixture and this can be attributed to the varying phase compositions. Thermodynamic modelling confirmed a high amount of ettringite formation in the CSA system and a lower capillary water and capillary porosity associated with this. The lower internal relative humidity of ettringite binders should be considered when using electrical measurements to evaluate their transport properties since it increases the total electrical resistivity.

show abstract

“…In recent work, thermodynamic calculations have been coupled with a pore partitioning model to account for the total aqueous content as well as the volume of solution that are in the 'classic' capillary and gel pores [39,40]. In this approach, the gel water is assumed to comprise two parts: the water that is released by phases upon heating to 100°C (e.g., ettringite, monosulfate, hydrotalcite, and hydrogarnet) and the portion of water on the surface of phases and in small pores, denoted by β.…”

Section: Pore Portioning Model To Determine 𝒗 𝑷𝑺𝑬 (Step 3)mentioning

confidence: 99%

Estimating Na+ and K+ concentrations of the pore solution based on ex-situ leaching tests and thermodynamic modeling

et al. 2022

View full text Add to dashboard Cite

Ex-situ leaching (ESL) methods have typically yielded higher sodium and potassium concentrations than pore solutions obtained using the conventional high-pressure extraction approach since ESL concentrations require a back-calculation to account for dilution. This paper proposes a new method for adjusting the concentrations obtained from ESL. Thermodynamic calculations were used to determine the total pore solution content, and a pore partitioning model was then used to separate the total solution into gel and capillary assignments. Using the refined pore solution volumes to adjust the concentrations from ESL improved the correlation to PSE concentrations.

show abstract

Extension of Powers-Brownyard Model to Pastes Containing Supplementary Cementitious Materials

Cited by 19 publications

References 58 publications

A nearly self-sufficient framework for modelling reactive-transport processes in concrete

A nearly self-sufficient framework for modelling reactive-transport processes in concrete

Factors Influencing the Electrical Properties of Ettringite Binders as Repair Materials

Estimating Na+ and K+ concentrations of the pore solution based on ex-situ leaching tests and thermodynamic modeling

Contact Info

Product

Resources

About