Fine-grained self-compacting concrete with polyfunctional additive and enhanced performance properties
DOI:
https://doi.org/10.54355/tbus/5.4.2025.0089Keywords:
fine-grained self-compacting concrete, strength, calcium hydrosilicates, cement hydration, additivesAbstract
The results of experimental studies aimed at improving the strength characteristics of cement stone and fine-grained self-compacting concrete through the use of polyfunctional modifying additives based on nano-silicon dioxide (nano-SiO2) and micro-dispersed mineral components are presented. It was established that the introduction of 0.03% nano-SiO2 by weight of cement increases the compressive strength of cement stone by up to 32%, which is associated with the intensification of clinker mineral hydration processes, the formation of an additional amount of low-base calcium hydrosilicates, and an increase in the number of crystallization centers in the early stages of hardening. The effectiveness of the combined use of nano-SiO2 with microsilica and micro-calcite, which are similar in composition to cement but differ in structure and functional activity, has been experimentally confirmed. The use of two-component systems made it possible to increase the flexural strength of cement stone by up to 29% compared to the reference samples. The greatest effect was achieved by adding a polyfunctional three-component additive, including nano-SiO2, microsilica, and micro-calcite, to the composition of fine-grained self-compacting concrete. The use of this system increased the compressive strength of concrete by 44% (to class B60) and the flexural strength by up to 12.5 MPa (an increase of 53.7% relative to the reference composition). It was additionally established that the complex of additives contributes to the acceleration of self-organization processes in the early stages of hardening by increasing the density of crystallization centers and a more uniform distribution of hydration products in the cement matrix volume.
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Copyright (c) 2025 Zhanar Zhumadilova, Assel Kanarbay, Daniyar Akhmetov, Assel Aldigaziyeva
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Ministry of Education and Science of the Republic of Kazakhstan
Grant numbers AP27511185
