Naslov
ASSESSMENT OF THE APPROVED ADDITION OF ZEOLITE SATURATED WITH ZINC IONS IN CEMENT PASTES, CEM I, WITH MONITORING OF SPECIFIC ELECTRICAL CONDUCTIVITY AND Pb-Cu ELECTRODE POTENTIAL

Autori
Dabić, Pero ; Barbir, Damir ; Lovrić, Josipa

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
CONFERENCE PROCEEDINGS: 20th International Conference on Materials, MATRIB 2019 / Šolić, Sanja ; Schauperl, Zdravko ; Pugar, Daniel - Zagreb : University North – University Center Varaždin Center for Digital Printing, 2019, 127-136

Skup
20th International Conference on Materials (MATRIB 2019)

Mjesto i datum
Vela Luka, Hrvatska, 27.06.2019. - 29.06.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
cement paste, saturated zeolite, binding time, conductometry, Pb-Cu electrode potential

Sažetak
According to the Croatian standard HRN EN 196-3 it is necessary to carry out the testing of the start time and the end of the binding of the cement material carried out by the Vicat apparatus. The exact starting time is difficult to determine because the method is based on the occasional release of the needle through the cement paste. A practical solution is the use of continuous measurements of certain properties of cement paste that change at the start of the binding of the cement paste. Such measurements enable conductometry and measurement of the electrode potential of the Pb-Cu electrode. The paper investigated the effect of zeolite saturated with Zn2+ ions at the binding time of cement paste prepared from CEM I by measuring specific electrical conductivity and electrode potential of Pb-Cu electrodes. Cement pastes were prepared with 0, 5, 10, 15, 20, 25 and 30 wt.% of zeolite saturated with Zn2+ ions and with water/solid ratio, W/S=0.5. The measurements were carried out at a constant temperature of 20 °C. Specific electrical conductivity curves obtained in dependance of time have a characteristic maximum conductivity after which the conductivity drops quickly. The appearance of the maximum conductivity corresponds to the start of binding of the cement pastes. Similarly, it can be seen in the curves of changing the electrode potential of the Pb-Cu electrode over time. Mathematical dependence on the occurrence of maximum specific conductivity and potential of the Pb-Cu electrode was determined with respect to the amount of added saturated zeolite.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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