Determination of time dependent diffusion coefficient aging factor of HPC mixtures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27120%2F20%3A10244808" target="_blank" >RIV/61989100:27120/20:10244808 - isvavai.cz</a>

Result on the web

<a href="https://www.scientific.net/KEM.832.11" target="_blank" >https://www.scientific.net/KEM.832.11</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/KEM.832.147" target="_blank" >10.4028/www.scientific.net/KEM.832.147</a>

Result language

angličtina

Original language name

Determination of time dependent diffusion coefficient aging factor of HPC mixtures

Original language description

This study investigates computation and distribution of the diffusion coefficient using fundamentals of electrochemistry for various concrete mixtures. The instrument utilized is a bulk conductivity meter which provides the bulk conductivity data for computation of the diffusion coefficient. Thirty three mixtures are investigated, where majority of them are ternary mixtures along with Ordinary Portland Cement (OPC) and binary mixtures. They are categorized in several groups based on the supplementary cementitious material (SCM) as a second component in ternary and binary based concrete mixtures. The variation and distribution of the diffusion coefficient in individual group is investigated from 7 days to 161 days. In addition, a new methodology is proposed to determine the aging factor of the diffusion coefficient of each concrete mixture. Aging of concrete is related to chloride ingress which leads to significant decrease of the diffusion coefficient with time. If this effect is not taken into account, considerable questions can be raised while predicting reliable and accurate service life of reinforced concrete structures. Further, aging factor is validated using a statistical analysis method based on published literature of Fisher Test permutation approach. Results show that diffusion coefficient in each group varies significantly and the addition of SCM and its varying replacement level influences the reduction of the diffusion coefficient remarkably over extended time period. Overall, this study could provide promising options for computation of the diffusion coefficient and its aging factor in light to its ease of measurement and shorter amount of time than conventional Rapid Chloride Permeability Test (RCPT) and other long term migration tests.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

20102 - Construction engineering, Municipal and structural engineering

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Key Engineering Materials

ISSN

1013-9826

e-ISSN

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Volume of the periodical

832

Issue of the periodical within the volume

February 2020

Country of publishing house

CH - SWITZERLAND

Number of pages

11

Pages from-to

11-20

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85081622318