New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions
A very simple method based on electrical conductivity and pH measurements was proposed for assessing reactivity of pozzolans. Calcium hydroxide:pozzolan water suspensions were monitored by means of measurements of electrical conductivity and pH values. In these suspensions, Ca(OH)2 in solid state wa...
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2014-12-01
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| Series: | Materiales de Construccion |
| Subjects: | |
| Online Access: | http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1563 |
| _version_ | 1819296780498501632 |
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| author | M. M. Tashima L. Soriano J. Monzó M. V. Borrachero J. L. Akasaki J. Payá |
| author_facet | M. M. Tashima L. Soriano J. Monzó M. V. Borrachero J. L. Akasaki J. Payá |
| author_sort | M. M. Tashima |
| collection | DOAJ |
| description | A very simple method based on electrical conductivity and pH measurements was proposed for assessing reactivity of pozzolans. Calcium hydroxide:pozzolan water suspensions were monitored by means of measurements of electrical conductivity and pH values. In these suspensions, Ca(OH)2 in solid state was initially present, being them, thus, saturated in this reagent. Three testing temperatures were selected (40, 50 and 60 °C). In the experiments carried out, calcium hydroxide was suspended in deionized water for yielding a lime saturated suspension. The addition of siliceous pozzolan (two types of rice husk ash RHA and two types of densified silica fume DSF were tested) to the saturated lime suspension can produce the unsaturation of the system, depending on the testing time, testing temperature and reactivity of pozzolan. When unsaturation was reached, the loss of electrical conductivity was higher than 30% and the variation of pH was higher than 0.15 units. These threshold values were selected for characterizing the reactivity of pozzolans by means of a proposed template, classifying the pozzolan in three different reactivity levels. |
| first_indexed | 2024-12-24T05:03:33Z |
| format | Article |
| id | doaj.art-d2da7d746c254933af133f7f7391090a |
| institution | Directory Open Access Journal |
| issn | 0465-2746 1988-3226 |
| language | English |
| last_indexed | 2024-12-24T05:03:33Z |
| publishDate | 2014-12-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Materiales de Construccion |
| spelling | doaj.art-d2da7d746c254933af133f7f7391090a2022-12-21T17:13:54ZengConsejo Superior de Investigaciones CientíficasMateriales de Construccion0465-27461988-32262014-12-0164316e032e03210.3989/mc.2014.009141508New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensionsM. M. Tashima0L. Soriano1J. Monzó2M. V. Borrachero3J. L. Akasaki4J. Payá5UNESP – Univ Estadual PaulistaUniversitat Politècnica de ValènciaUniversitat Politècnica de ValènciaUniversitat Politècnica de ValènciaUNESP – Univ Estadual PaulistaUniversitat Politècnica de ValènciaA very simple method based on electrical conductivity and pH measurements was proposed for assessing reactivity of pozzolans. Calcium hydroxide:pozzolan water suspensions were monitored by means of measurements of electrical conductivity and pH values. In these suspensions, Ca(OH)2 in solid state was initially present, being them, thus, saturated in this reagent. Three testing temperatures were selected (40, 50 and 60 °C). In the experiments carried out, calcium hydroxide was suspended in deionized water for yielding a lime saturated suspension. The addition of siliceous pozzolan (two types of rice husk ash RHA and two types of densified silica fume DSF were tested) to the saturated lime suspension can produce the unsaturation of the system, depending on the testing time, testing temperature and reactivity of pozzolan. When unsaturation was reached, the loss of electrical conductivity was higher than 30% and the variation of pH was higher than 0.15 units. These threshold values were selected for characterizing the reactivity of pozzolans by means of a proposed template, classifying the pozzolan in three different reactivity levels.http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1563reactioncharacterizationsiliceous pozzolansilica fumerice husk ash |
| spellingShingle | M. M. Tashima L. Soriano J. Monzó M. V. Borrachero J. L. Akasaki J. Payá New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions Materiales de Construccion reaction characterization siliceous pozzolan silica fume rice husk ash |
| title | New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions |
| title_full | New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions |
| title_fullStr | New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions |
| title_full_unstemmed | New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions |
| title_short | New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions |
| title_sort | new method to assess the pozzolanic reactivity of mineral admixtures by means of ph and electrical conductivity measurements in lime pozzolan suspensions |
| topic | reaction characterization siliceous pozzolan silica fume rice husk ash |
| url | http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1563 |
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