Advances in concrete construction

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The influencing factors for the strength enhancement of composite materials made up of fine high-calcium fly ash

  • Olga M. Sharonova (Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center ) ;
  • Leonide A. Solovyov (Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center ) ;
  • Alexander G., Anshits (Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center )
  • Received : 2021.08.28
  • Accepted : 2023.12.20
  • Published : 2023.09.25
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Abstract

The aim of the study was to establish the influence of particle size, chemical and phase composition of fine microspherical high-calcium fly ash (HCFA), as well as superplasticizer content on the strength of cementless composite materials based on 100% HCFA and mixtures of HCFA with Portland cement (PC). For the initial HCFA fractions, the particle size distribution, chemical and quantitative phase composition were determined. The compressive strength of cured composite materials obtained at W/B 0.4 and 0.25 was determined at a curing time of 3-300 days. For cementless materials, it was found that a change in the particle size d90 from 30 ㎛ (fraction 3) to 10 ㎛ (fraction 4) leads to an increase in compressive strength by more than 2 times. Compressive strength increases by at least another 2.2 times with the addition of Melflux 5581F superplasticizer (0.12%) and at W/B 0.25. The HCFA-PC blends were investigated in the range of 60-90% HCFA and the maximum compressive strength was found at 80% HCFA. On the basis of 80% HCFA-20% PC blend, the samples of ultra-high strength (108 and 150 MPa at 28 and 100 days of hardening) were obtained with the addition of 0.3% Melflux 5581F and 5% silica fume. The quantitative phase composition was determined for composite materials with a curing age of 28 days. It has been established that in a sample with ultra-high strength, a more complete transformation of the initial phases of both HCFA and PC occurs as compared to their transformation separately.

Keywords

Acknowledgement

The authors are grateful to E.V. Mazurova for obtaining SEM images. This work was conducted within the framework of the budget project # FWES-2021-0013 for Institute of Chemistry and Chemical Technology SB RAS using the equipment of Krasnoyarsk Regional Research Equipment Centre of SB RAS.

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