STUDY OF THE INFLUENCE OF TECHNOLOGICAL FACTORS ON THE DENSITY AND STRENGTH OF ASH-GAS CONCRETE
Begentayev М. Nurpeisova М. Kuldiev E. Nurlybaev R. Bek U.
2024National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2024#1Issue 46345 - 57 pp.
Study purpose is to establish influence of technological factors of production on density and strength of ash-gas concrete. Study object is ash-gas concrete with density of 700, 800 and 900 kg/m3based on Portland cement CEM I 42.5 D0 and fly ash from Ekibastuz GRES-2. Research methodology. Composition of ash-gas concretes with average density of 700, 800 and 900 kg/m3was developed in accordance with technical requirements of SN 277–80. Instructions for manufacture of products from cellular concrete. Dry mixtures with specific surface area of about 450 m2/kg are obtained by joint grinding of ash and cement (with addition of 3…5 % gypsum). Grinding was carried out in a NOAH NQM-0.4 PLANETARY BALL MILL manufactured by YANGZHOU NUOYA MACHINERY CD., LTD. Solution mixture was prepared as follows: • in working capacity of mixer with a speed of 410 rpm was poured up to 95 % of required amount of water, then mixer impeller was turned on, after which ash, cement and bassanite (semi-aqueous gypsum) were sequentially fed; • mixture was stirred for 3–4 minutes, and then, without stopping, required amount of aqueous suspension of aluminum powder was introduced, after which mixture was additionally stirred for 1–2 minutes. In the work, influence of such technological factors as grinding, composition, water temperature and water-solid ratio on density and strength of gas-ash cement was studied. Influence of technological factors on density and strength of ash-gas concrete was studied on the base composition. It has been established that technological factors of production, such as dispersion and composition of mixture, water-to-solid ratio and mixing water temperatures, have a significant impact on density and strength of ash-gas concrete, therefore, optimization of these factors makes it possible to obtain ash-gas concrete with a given density and strength. Novelty lies in establishment of regular features of influence, depending on type of technological factors, on density and strength of ash-gas concrete with average density. Practical significance lies in production of ash-gas concretes with given density and strength by adjusting parameters of technological factors.
density , dispersion composition , fly ash concrete , strength , temperature , water-to-solid ratio
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Kazakh National Research Technical University named after K.I. Satpayev, Almaty, Kazakhstan
Science Department of the National Academy of Sciences of the Republic of Kazakhstan, Almaty, Kazakhstan
Kazakh National Research Technical University named after K.I. Satpayev
Science Department of the National Academy of Sciences of the Republic of Kazakhstan
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