Determination of the start and the end of binding time of portland cement pastes with the addition of the different fractions of waste container glass by electrochemical method : bachelor thesis

Abstract

U radu je ispitivan utjecaj dodatka otpadnog ambalažnog stakla različitih frakcija na vrijeme vezivanja cementnih kompozita primjenom elektrokemijske metode s Pb-Cu elektrodnim parom. Ispitivanja su provedena na portland cementnim pastama uz dodatak stakla s udjelom 20 mas.%. različitih frakcija (<45m, 125-250 m i 250-500 m) pri normalnoj konzistenciji i pri V/C=0,5 odnosno V/K=0,5. Uvođenjem otpadnog ambalažnog stakla u sustav cement-voda, reakcijski sustav se proširuje i postaje složeniji. Javljaju se nove interakcije u sustavu, a kao posljedica toga uspostavljaju se nove ravnoteže i ravnotežni sustavi. Pri V/C=0,5 odnosno V/K=0,5 otpadno ambalažno staklo značajnije usporava hidrataciju dok je za uzorke pri normalnoj konzistenciji taj utjecaj manji. Krupnije čestice otpadnog stakla više utječu na hidratacijske procese.The paper analyzes the effect of the addition of various fraction of waste container glass at the binding time of cement composites using an electrochemical method with a Pb-Cu electrode pair. Tests were carried out on portland cement paste with addition of 20 wt. % of waste glass with different fractions (<45 μm, 125-250 μm and 250-500 μm) at normal consistency and at W/C = 0.5 and W/S = 0.5 respectively. By introducing waste container glass into the cement-water system, the reaction system is expanding and becoming more complex. New interactions are occurring in the system, and as a result new equilibrium and equilibrium systems are established. At W/C = 0.5 and W/S = 0.5, the waste glass significantly slows down hydration while for samples with normal consistency this effect is smaller. Greater particles of waste glass have more effect on hydration processes