Abstract
This paper discusses studies regarding the impact of fine-ground glass additives on the hydration and properties of alumina cement pastes and mortars. Fine-ground glass was added to pastes and mortars instead of high-alumina cement and calcium aluminate cement in quantities of 5% and 10%. The findings are inconclusive as to the impact of glass on the properties of tested alumina cement types. The effect produced via the addition of glass instead of cement depends on the type of alumina cement used. Adding fine-ground glass to high-alumina cement enhances the paste’s density while improving paste and mortar strength. Using the same additive for calcium aluminate cement reduces its density and strength. The addition of glass to high-alumina cement adversely affects its strength at higher temperatures.
Highlights
Alumina cement is a type of cement characterized by very high early-stage hydration heat and demonstrates a rapid gain of strength
High-alumina cement is more susceptible to conversion than calcium aluminate cement (CAC) due to its higher mineral monocalcium aluminate and dicalcium
Based on the analysis of the obtained research results, the following conclusions can be drawn: be drawn: The effect of glass on the properties of alumina cement types depends on the cement The effect of glass on the properties of alumina cement types depends on the ceused, with the impact on paste and mortar properties being proportional to the mono- and ment used, with the impact on paste and mortar properties being proportional to the dicalcium aluminate content in the cement
Summary
Alumina cement is a type of cement characterized by very high early-stage hydration heat and demonstrates a rapid gain of strength. The increased hydration heat characteristic of alumina cement ( known as self-heating) allows for the pouring of concrete at low temperatures. A disadvantage of alumina cement is the conversion process, in which unstable low-density calcium aluminate hydrates turn into durable, high-density hydrates. Such an increase in density may reduce the strength of the products. These density changes are considered inevitable and irreversible but necessary to achieve alumina cement’s desired properties [6,7]. Conversion needs to occur as the cement paste is hardening, not later [6,12,13,14]
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