Influance of the furnance slag as a replacement addition on the process of cement hydration : bachelor thesis

Abstract

U radu je istraživan utjecaj aditiva za poboljšanje mljevenja klinkera trgovačkog naziva HEA 213 Grace ili HEA2® od proizvođača GCP Applied Technologies Inc., na procese hidratacije cementa pripravljenog na poluindustrijskom kugličnom mlinu u laboratoriju CEMEX Hrvatska d.d. U fazi priprave cementa u smjesu klinkera i gipsa dodan je aditiv HEA 213 Grace u iznosu 0,032 mas.% na masu cementa. Provedena su mjerenja ispitivanja utjecaja aditiva za poboljšanje mljevenja klinkera na početak i kraj vezanja cementa. Za mjerenje brzine vezanja cementnih pasti pripravljene paste su zadovoljavale normalnu konzistenciju i vodocementni faktor (V/C) je bio u rasponu od 0,26 do 0,27. Budući da se čisti cement vrlo često koristi u svrhu priprave miješanih cemenata u radu je ispitivan utjecaj zamjenskog dodatka troske na procese hidratacije. U tu svrhu troska je dodana u iznosu od 0, 5, 10, 15, 20, 25 i 30 mas.% kao zamjenski dodatak na masu cementa. U ovom sustavu hidratacija je praćena provedbom konduktometrijskih mjerenja električne provodnosti u pripravljenim vodenim suspenzijama (voda/cement=4 (V/C)) pri konstantnoj temperaturi od 20 o C. Na istim sustavima je napravljeno i mjerenje količine hidratacijom oslobođenih Ca 2+ iona u različitim vremenskim intervalima u periodu do 12 sati hidratacije.In this paper was analyzed the effect of additives for improving the milling cement of the trade name HEA 213 Grace or the HEA2® manufacturer of the GCP Applied Technologies Inc. on the hydration processes of cement prepared in the semi-industrial ball mill at the laboratory of the CEMEX Hrvatska d.d.. In the stage of cement preparation in a mixture of clinker and gypsum, additive HEA 213 Grace was added in an amount of 0.032% by weight on the cement mass. The influence of additives for improving the grinding on the hydration processes was performed by measuring the influence of the additive at the beginning and end of the bonding. For measuring the speed of bonding of cement paste the prepared pastes had a normal consistency and the water factor (V/C) ranged from 0.26 to 0.27. Since cement is often used for the purpose of preparing mixed cement, the impact of the substitution of the furnace slag on the hydration process is investigated. For this purpose, the furnace slag is added in the amount of 0, 5, 10, 15, 20, 25 and 30 mas. % on the cement mass. In this system hydration was monitored by conductometric measurements of electrical conductivity in prepared aqueous suspensions (water/cement = 4 (V/C)) at a constant temperature of 20°C. Hydration of free Ca 2+ ions was also performed on the same systems at different time intervals for up to 12 hours of hydration