Influence of composition mineral additives on cement properties
DOI:
https://doi.org/10.15587/2312-8372.2014.25355Keywords:
cement, mineral additives (admixtures), recycling wastes, normal density, hydration, hardening, propertiesAbstract
The influence of silicate-containing materials of different origin on cement properties was studied. The selected mineral additives have significant differences in both chemical and mineralogical composition.
It was found that the condition of a silicate and component admixture affects the rate of cement hardening. The presence of amorphous silica or glass in the additive slows down the cement strengthening in early hardening periods, while the introduction of heat-treated materials with a high content of thermally-activated aluminates to cement can speed up the process significantly.
In this regard, a number of additives, containing the amorphous silica cannot be used as such in the production of composite cement. Adding them to the composition of the latter causes a significant increase in the cement paste normal density that will certainly leads to significant degradation of strength properties of hardened cement paste.
The presence of a small amount of chemically inert solid minerals in the admixture material can improve the cement strength. Such materials can act as microfillers, thereby increasing the mechanical strength of samples.
Thus, when developing the composition of composite cement, it is appropriate introducing several additives that would have a positive effect either on the strength of samples in early periods of hardening or the grade strength of cement. The wastes of recycling coal mining debris are proposed to be used as mineral additives in cement production.References
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