Application of Feldspar Sand in Non-Autoclaved Foam Concrete Technology
Saduakassov M. Lapin V. Kopzhassarov B. Tokmadzheshvili G. Кushekov E. Ibraimbayeva G.
September 2025Salehan Institute of Higher Education
Civil Engineering Journal (Iran)
2025#11Issue 93901 - 3915 pp.
The aim of this study is to determine the possibility of producing non-autoclaved foam concrete of grade M35 with a density of 900 kg/m³. A distinctive feature of this development is the testing of twin samples from the same batch: some were steamed in a chamber at 90 °C under normal atmospheric pressure, while others were autoclaved at a pressure of 8 bar and a temperature of 170 °C. It was established that ordinary natural feldspar sands with a fineness modulus ranging from 1.43 to 2.45, containing quartz below the standard-regulated levels, can be used in the production of non-autoclaved foam concrete. It is not possible to obtain non-autoclaved D900 foam concrete of grade M35 strength using only cement, sand, and foaming agent. To achieve the specified strength, it is necessary to use coarse sand with a fineness modulus (FM) greater than 3, subjected to short-term grinding to reduce the FM to recommended values, and to additionally introduce sol-gel liquid glass. The novelty lies in the experimental confirmation of the features of strength formation in cellular concrete under both non-autoclaved and autoclaved curing conditions. Comparative tests showed that high strength in cellular concrete is achieved only when a chemical bond forms between the products of cement hydrolysis and hydration with quartz sand grains—conditions made possible through autoclaving.
Autoclave , Feldspar Sand , Foam Concrete , Non-Autoclave , Quartz Sand , Sound Insulation
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Kazakh Academy of Architecture and Construction Sciences, 21 Solodovnikova, Almaty, 050000, Kazakhstan
Kazakh Research and Design Institute of Construction and Architecture Joint-Stock Company, 21 Solodovnikova, Almaty, 050000, Kazakhstan
South Kazakhstan University named after M. Auezov, 5 Tauke Khana, Shymkent, 160012, Kazakhstan
International Education Corporation (KazGASA), 28 Ryskulbekov, Almaty, 050043, Kazakhstan
Kazakh Academy of Architecture and Construction Sciences
Kazakh Research and Design Institute of Construction and Architecture Joint-Stock Company
South Kazakhstan University named after M. Auezov
International Education Corporation (KazGASA)
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