The Use of Layered Double Hydroxides in the Composition of Cement Compositions

The article presents the results of the synthesis of the layered Mg–Al double hydroxide (LDH), studied its effect on the kinetics of hardening, setting time and strength of Portland cement stone. The methods of introduction of the LDH in the composition of the cement composition are considered. It is determined that the introduction of the nano-additive LDH Mg–Al into the composition of the cement composition reduces the setting time of the cement paste and increases the strength of the cement stone both in the early and late periods of hardening. Ultrasonic dispersion of Mg–Al LDH in aqueous medium in the presence of surfactants, as well as joint introduction with superplasticizer promotes the uniform distribution of the additive in the volume of cement composition and increases the strength of cement stone. The greatest effect is achieved by the introduction of the nano-additive LDH together with superplasticizer into the composition of the cement composition, the strength of cement stone at a dosage of 0.1–1 wt.% Of LDH Mg–Al increases at the age of 1 day by 2.2–2.4 times, and 28 days – 1.2–1.6 times. Layered double hydroxide Mg–Al does not lead to the formation of new phases, but increases the number of hydrated newgrowths. Layered double hydroxide Mg–Al is a promising material and can be used as a hardening accelerator to produce fast-hardening, high-strength cement compositions.

V.V. TYUKAVKINA, Candidate of Sciences (Engineering)
V.A. MATVEEV, Doctor of Sciences (Engineering)
A.V. TSYRYATEVA, Engineer

Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials named after I.V. Tananaev, FRC, Kola Science Centre of the Russian Academy of Sciences (26a, Akademgorodok micro-district, Apatity, 184209, Russian Federation)

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