THERMAL ANALYSIS OF PORTLANDSEMENT OBTAINED ON THE BASIS OF FLOTATION WASTE FROM THE ENRICHMENT FACTORY “HONJIZA”

Abstract

Currently, various types of Cements are produced in the world - hydrophobic, sulfate, acid, alkali and salt-resistant, adapted to different conditions[1]. A thermal analysis has been performed to study the effect of additives on cement properties and the properties of phase changes in cement stone depending on the time of hydration of the cement. In thermal analysis, an endoeffect was detected at 200°C [2]. It has been reported that calcium hydroxide is converted to calcium hydroalyumosilicate, while exoeffet at 900°C corresponds to the crystallization of calcium silicate and aluminate. The established properties of the hydration of cement with active mineral additives cause it to undergo complex physicochemical changes in the solidification process [3]. To study these, the properties of modified cement, cement pastes and the concretions obtained on their basis are determined [4]. This study found that the rational amount of additive added to portlandsement should be 10-20% relative to the mass of cement. It has been noted that the high pressure force is 54.5 MPa, equal to 7.7 MPA for bending, and on average 10% more than regular cement [5].