New method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorTashima, Mauro Mitsuuchi
dc.creatorSoriano, L.
dc.creatorMonzo, J.
dc.creatorBorrachero, M. V.
dc.creatorAkasaki, Jorge Luis
dc.creatorPaya, J.
dc.date2015-03-18T15:56:24Z
dc.date2016-10-25T20:35:36Z
dc.date2015-03-18T15:56:24Z
dc.date2016-10-25T20:35:36Z
dc.date2014-01-01
dc.date.accessioned2017-04-06T07:18:45Z
dc.date.available2017-04-06T07:18:45Z
dc.identifierMateriales De Construccion. Madrid: Inst Ciencias Construccion Eduardo Torroja, v. 64, n. 316, 12 p., 2014.
dc.identifier0465-2746
dc.identifierhttp://hdl.handle.net/11449/117543
dc.identifierhttp://acervodigital.unesp.br/handle/11449/117543
dc.identifier10.3989/mc.2014.00914
dc.identifierWOS:000345866800003
dc.identifierWOS000345866800003.pdf
dc.identifierhttp://dx.doi.org/10.3989/mc.2014.00914
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/928190
dc.descriptionA 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 degrees 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.
dc.languageeng
dc.publisherInst Ciencias Construccion Eduardo Torroja
dc.relationMateriales De Construccion
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectReaction
dc.subjectCharacterization
dc.subjectSiliceous pozzolan
dc.subjectSilica fume
dc.subjectRice husk ash
dc.titleNew method to assess the pozzolanic reactivity of mineral admixtures by means of pH and electrical conductivity measurements in lime:pozzolan suspensions
dc.typeOtro


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