Evaluation of the chloride diffusion coefficient in blended concrete and service life prediction of RC structures
By: Nair, Krishna Gopi
.
Contributor(s): Rathod, Jashvantkumar Devabhai.
Publisher: Mumbai ACC LTD 2022Edition: Vol.97(2), Feb.Description: 21-36p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian Concrete Journal - ICJSummary: Chloride diffusion coefficient is determined in control concrete and with partial replacement of cement by fly ash, silica fume and slag in binary and ternary blended mixtures. Diffusion coefficients obtained from short and longer duration methods are compared, and the relationship between them is established. Binary/ternary blended concrete exhibits a chloride diffusion coefficient typically 6-7 times less than that for concrete without mineral admixtures. Rapid chloride ion permeability test (RCPT) gives the lowest value of the chloride diffusion coefficient whereas salt ponding test gives a substantially higher chloride diffusion coefficient among all the tests. An equation is proposed to predict chloride diffusion coefficient for binary/ ternary blended concrete from RCPT values. Nernst Plank, and Olek equations can be used for calculation of chloride diffusion coefficients from the values of Coulomb obtained in RCPT. Prediction of equivalent chloride diffusion coefficient of bulk diffusion test can be made from the rapid migration test result with highest level of confidence. Reinforced concrete structures containing binary/ternary blended concrete exhibit a service life double than that of concrete without a mineral admixture.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2023-0972 |
Chloride diffusion coefficient is determined in control concrete and with partial replacement of cement by fly ash, silica fume and slag in binary and ternary blended mixtures. Diffusion coefficients obtained from short and longer duration methods are compared, and the relationship between them is established. Binary/ternary blended concrete exhibits a chloride diffusion coefficient typically 6-7 times less than that for concrete without mineral admixtures. Rapid chloride ion permeability test (RCPT) gives the lowest value of the chloride diffusion coefficient whereas salt ponding test gives a substantially higher chloride diffusion coefficient among all the tests. An equation is proposed to predict chloride diffusion coefficient for binary/ ternary blended concrete from RCPT values. Nernst Plank, and Olek equations can be used for calculation of chloride diffusion coefficients from the values of Coulomb obtained in RCPT. Prediction of equivalent chloride diffusion coefficient of bulk diffusion test can be made from the rapid migration test result with highest level of confidence. Reinforced concrete structures containing binary/ternary blended concrete exhibit a service life double than that of concrete without a mineral admixture.
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