INFLUENCE OF GROUND BLAST-FURNACE SLAG ON THE PROPERTIES OF CEMENT-BASED COMPOSITIONS
DOI:
https://doi.org/10.31650/2786-6696-2026-17-77-84Keywords:
Portland cement, blast furnace slag, binder, exothermic heating, compressive strength.Abstract
In the production of blended mineral binders, one of the key challenges is establishing optimal proportions between Portland cement and a mineral addition. This article examines a blended binder produced by mixing Portland cement without mineral additions with ground blast-furnace slag dried to constant mass, with the slag content ranging from 0% to 35%.
This binder meets the requirements of DSTU B V.2.7-46:2010, General-Purpose Cements. Specifications, and, according to its type and composition, is classified as Portland cement with slag.
The article examines the effects of ground slag on the bulk density and true density, normal consistency, setting times, exothermic temperature rise, and compressive strength of hardened cement paste. The experimental results showed that incorporating up to 35% blast-furnace slag into Portland cement causes a slight decrease in the bulk density of the blended binder, as well as in true density, specific surface area, and the normal consistency of cement paste.
With regard to the effect of ground blast-furnace slag content on the setting times of cement paste, increasing the slag content from 0% to 35% extends both setting times: the initial setting time increases from 3 h 20 min to 4 h 50 min, while the final setting time increases from 4 h 50 min to 7 h 10 min. Increasing the amount of ground blast-furnace slag in the blended binder reduces the exothermic temperature rise from 45.6 °C, in the absence of slag, to 31 °C when the binder contains 35% blast-furnace slag.
The experimental results indicate that incorporating blast-furnace slag into Portland cement reduces the compressive strength of hardened cement paste at all tested curing ages. It should be noted that as the curing period increases from 3 to 28 days, the difference in strength between cement pastes made with cement without mineral additions and that made with cement containing 35% blast-furnace slag decreases. This indicates the high reactivity of the blast-furnace slag.
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