Influence of natural zeolite addition to specific electrical conductivity of portland cement suspension : bachelor thesis
| Autor: | Seletković, Klara |
|---|---|
| Přispěvatelé: | Barbir, Damir |
| Jazyk: | chorvatština |
| Rok vydání: | 2018 |
| Předmět: |
portland cement-CEM I
conductometry specifična električna provodnost zeolita TEHNIČKE ZNANOSTI. Kemijsko inženjerstvo TECHNICAL SCIENCES. Chemical Engineering natural zeolites hidratacija cementa konuktometrija Hrvatska.Donje Jesenje(Krapina) specific electrical conductivity of zeolites prirodni zeoliti cement hydration Croatia.Donje Jesenje(Krapina) |
| Popis: | U ovom radu provedeno je istraživanje specifične električne provodnosti vodene suspenzije industrijskog portland cementa, uz dodatak 0, 5, 10, 15, 20, 25 i 30 mas. % zeolitnog tufa – prirodnog zeolita iz nalazišta Donje Jesenje (Krapina), prosijanog kroz standardno sito 125 μm. Konduktometrijska mjerenja provedena su u termostatu pri 20 °C, a omjer voda/kruto bio je konstantan, V/K=4. Određivanje specifične električne provodnosti provedeno je do 25 sati konduktometrijskom metodom. Dobivene krivulje nakon eksperimentalnog rada ukazuju na ovisnost specifične električne provodnosti o vremenu i dodatku zeolitnog tufa, gdje je naglašen vrh maksimalne provodnosti. Rezultati pokazuju da povećanje dodatka prirodnog zeolita uzrokuje ukupan pad vrijednosti specifične električne provodnosti i pojavu maksimuma u kasnijim vremenima hidratacije, no poslije to nije pravilo. Dodatak zeolita ne utječe na mehanizam procesa hidratacije već na kinetičke parametre i dinamiku odvijanja procesa hidratacije cementa, budući da krivulje zadržavaju sličan oblik. In this paper, a study of the specific electrical conductivity of an aqueous suspension of the Portland cement was carried out with addition of 0, 5, 10, 15, 20, 25 and 30 wt.% of zeolite – natural zeolite from the Donje Jesenje (Krapina), sifted through 125 μm standard sifter. Conductometric measurements were carried out in a thermostat at 20 °C and at the water/cement ratio, W/C = 4. Determination of specific electrical conductivity was conducted by conductometric method up to 25 hours. The obtained curves after the experimental work indicate the dependence of the specific electrical conductance of time and the addition of the zeolite, where the peak of maximum conductivity is emphasized. The results show that the increase in the addition of natural zeolite causes a total drop in the value of specific electrical conductivity and the occurrence of the maximum in later hydration times, but after that it is not a rule. The addition of zeolite does not affect the mechanism of the hydration process but on the kinetic parameters and dynamics of the process of hydration of cement, since the curves retain a similar shape. |
| Databáze: | OpenAIRE |
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