Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching

The high alkaline condition of concrete naturally protects embedded steel bars from corrosion by forming a passive protective film. The pH of concrete is generally high, but concrete with different mix compositions may have various pH values. The pH of concrete may decrease over time due to long-ter...

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Main Authors: Loh, Poh-Yee, Shafigh, Payam, Katman, Herda Yati, Ibrahim, Zainah
Format: Article
Published: Elsevier 2024
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Online Access:http://eprints.um.edu.my/45606/
https://doi.org/10.1016/j.heliyon.2024.e25859
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spelling my.um.eprints.456062024-11-06T02:58:19Z http://eprints.um.edu.my/45606/ Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching Loh, Poh-Yee Shafigh, Payam Katman, Herda Yati Ibrahim, Zainah TA Engineering (General). Civil engineering (General) TH Building construction The high alkaline condition of concrete naturally protects embedded steel bars from corrosion by forming a passive protective film. The pH of concrete is generally high, but concrete with different mix compositions may have various pH values. The pH of concrete may decrease over time due to long-term mechanical, chemical, biological and physical factors. Therefore, monitoring the pH value of concrete is crucial to checking if its alkalinity is within an acceptable range and ensuring that the concrete structure is in good health condition. However, the pH measurement for cementbased materials is not standardised. Ex-situ leaching, one of the recommended methods for pH measurement, is simple and practical. In this method, the sample will be crushed, leached and tested using a pH electrode probe. The lifespan of the pH electrode probe may decrease due to the existing suspended particles in the solution. Therefore, one recommendation is to filter the solution before using the probe. In this study, the effect of different filtering setups on the pH value of a cement mortar with a cement-to-sand ratio of 1:3 was evaluated. pH test results showed that filtering can produce similar outcomes to those without filtering, regardless of the type of filter paper and its pore size. However, filtering is strongly recommended for electrode protection of the pH meter. As an innovative filtering setup for cement-based materials, syringe filtering was introduced in this study because it is more economical and its operation is simpler compared to the other methods. Elsevier 2024-02 Article PeerReviewed Loh, Poh-Yee and Shafigh, Payam and Katman, Herda Yati and Ibrahim, Zainah (2024) Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching. Heliyon, 10 (4). e25859. ISSN 2405-8440, DOI https://doi.org/10.1016/j.heliyon.2024.e25859 <https://doi.org/10.1016/j.heliyon.2024.e25859>. https://doi.org/10.1016/j.heliyon.2024.e25859 10.1016/j.heliyon.2024.e25859
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TA Engineering (General). Civil engineering (General)
TH Building construction
spellingShingle TA Engineering (General). Civil engineering (General)
TH Building construction
Loh, Poh-Yee
Shafigh, Payam
Katman, Herda Yati
Ibrahim, Zainah
Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching
description The high alkaline condition of concrete naturally protects embedded steel bars from corrosion by forming a passive protective film. The pH of concrete is generally high, but concrete with different mix compositions may have various pH values. The pH of concrete may decrease over time due to long-term mechanical, chemical, biological and physical factors. Therefore, monitoring the pH value of concrete is crucial to checking if its alkalinity is within an acceptable range and ensuring that the concrete structure is in good health condition. However, the pH measurement for cementbased materials is not standardised. Ex-situ leaching, one of the recommended methods for pH measurement, is simple and practical. In this method, the sample will be crushed, leached and tested using a pH electrode probe. The lifespan of the pH electrode probe may decrease due to the existing suspended particles in the solution. Therefore, one recommendation is to filter the solution before using the probe. In this study, the effect of different filtering setups on the pH value of a cement mortar with a cement-to-sand ratio of 1:3 was evaluated. pH test results showed that filtering can produce similar outcomes to those without filtering, regardless of the type of filter paper and its pore size. However, filtering is strongly recommended for electrode protection of the pH meter. As an innovative filtering setup for cement-based materials, syringe filtering was introduced in this study because it is more economical and its operation is simpler compared to the other methods.
format Article
author Loh, Poh-Yee
Shafigh, Payam
Katman, Herda Yati
Ibrahim, Zainah
author_facet Loh, Poh-Yee
Shafigh, Payam
Katman, Herda Yati
Ibrahim, Zainah
author_sort Loh, Poh-Yee
title Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching
title_short Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching
title_full Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching
title_fullStr Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching
title_full_unstemmed Effect of filtering method on the pH measurement of cement mortar in ex-situ leaching
title_sort effect of filtering method on the ph measurement of cement mortar in ex-situ leaching
publisher Elsevier
publishDate 2024
url http://eprints.um.edu.my/45606/
https://doi.org/10.1016/j.heliyon.2024.e25859
_version_ 1816130425662210048
score 13.214268