NDLI: Structurization of cement systems with nanodispersed silica stabilized with acetate ions

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Structurization of cement systems with nanodispersed silica stabilized with acetate ions

Content Provider	Scilit
Author	Lukuttsova, N. P. Golovin, S. N.
Copyright Year	2019
Description	Journal: Iop Conference Series: Materials Science and Engineering The influence of a modifying additive in the form of silica sol stabilized with acetate ions on the structure and properties of cement stone has been studied. The mechanism of structure formation in the system of “cement-nanodispersed silica (NDS) stabilized with acetate ions” is proposed. It includes two aspects. In the initial period of hydration the crystallization of calcium hydroacetoaluminates occurs, the rate of their formation being higher than the rate of ettringite formation. Their crystals have some micro-reinforcing effect on cement stone, increasing its density and strength. The nanodisperse silica in combination with the calcium hydroacetoaluminates is directly involved in the structurization of cement stone, colmataging the pores. $Si^{4+}$ atoms, building-in in the structure of portlandite phases, increase the impermeability of cement stone. The generation of calcium hydroacetoaluminates leads to the formation of the primary carcass, providing the strength development of cement stone in the early stages of hardening. It is established that adding the modifier results in pore redistribution in size: a decline in the amount of macropores and an increase in the quantity of the gel pores and submicropores (5-0.1 µm) at a constant micropore volume (0.1-20 µm).
Related Links	https://iopscience.iop.org/article/10.1088/1757-899X/687/2/022019/pdf
ISSN	17578981
e-ISSN	1757899X
DOI	10.1088/1757-899x/687/2/022019
Journal	Iop Conference Series: Materials Science and Engineering
Issue Number	2
Volume Number	687
Language	English
Publisher	IOP Publishing
Publisher Date	2019-12-01
Access Restriction	Open
Subject Keyword	Journal: Iop Conference Series: Materials Science and Engineering Building and Construction Nanodispersed Silica Acetate Ions Calcium Hydroacetoaluminates
Content Type	Text
Resource Type	Article

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