Effect of Ore and Finely Dispersed Fractions of Wollastonite From the Koytash Deposit on The Structure and Strength of Non-Autoclaved Foam Concrete
Abstract
The article investigates the possibility of using ore and finely dispersed fractions of Koytash wollastonite from the Jizzakh region as a structure-modifying additive in non-autoclaved cement–fly ash foam concrete. The objective of the study was to determine the effect of the fractional state and dosage of wollastonite on the aggregative stability of the mix, the density of interpore partitions, compressive strength, and thermal conductivity. Compared with the control composition, the ore fraction was found to reduce the settlement of the mix from 14 mm to 9–11 mm, while the finely dispersed fraction reduced it to the range of 6–8 mm. When 1.0–1.5% finely dispersed wollastonite was used, the 28-day compressive strength increased from 1.30 MPa to 1.78–1.92 MPa, and the 90-day strength increased to 2.05–2.25 MPa. At the same time, the thermal conductivity coefficient decreased from 0.135 to 0.128–0.130 W/(m·°C). The results were explained by the role of wollastonite as a microfiller, a nucleation center, and a factor promoting the densification of interpore partitions.
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