Effect of modifiers and mineral additives from industrial waste on the quality of aerated concrete products

Sabitov, Yerlan; Dyussembinov, Duman; Bazarbayev, Daniyar

doi:10.54355/tbus/1.4.2021.0010

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…The first steps in this direction were made by Japanese scientists in the 1980s. Since then, a lot of its modifications have been proposed, including the use of mineral additives from heavy industry waste [4][5]. Despite the fact that there have been many studies on CMCs, because of regional specifics, this area is still relevant, especially in Kazakhstan [6][7].…”

Section: Introductionmentioning

confidence: 99%

Study of cement binders applicable for modified cast-in-place concrete

Khonjo

Toleuov

Azbergenova

et al. 2022

tbus

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This article presents the results of experimental studies of cement binder from local raw material bases optimal for the production of cast modified concrete (CMC). Having a special self-compacting nature, as well as a sensitive cost-effectiveness for the Kazakhstan concrete mixtures manufacturer, this type of concrete requires the use of cement with stable physical and technical characteristics. The study conducted an analysis of the nomenclature of local bases of cement raw materials, testing for cement fineness of Portland cement PC 400 D20 and compressive strength. It is revealed that in Kazakhstan there is a fairly wide range of cement products available with and without additives, produced by dry and wet method. Samples of Portland cement with mineral additives were taken for testing. According to the results of tests, the best indicators of grinding fineness 94.65% and compressive strength on 28 days 42.8 MPa were obtained for Portland cement with mineral additives of Bukhtarminskaya cement company LLP, produced by wet method.

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Section: Introductionmentioning

confidence: 99%

Study of cement binders applicable for modified cast-in-place concrete

Khonjo

Toleuov

Azbergenova

et al. 2022

tbus

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The use of superplasticizers in multicomponent concrete mixtures

Stenechkina

2023

E3S Web of Conf.

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In addition to the positive effect of the introduction of a superplasticizer, there are also negative ones: an increase in the period of structure formation, a significant air entrainment and, as a result, a decrease in strength. One of the ways to reduce the negative impact on the structure and properties of concrete composites is the method of preparing a suspension, which consists in first dissolving 10% of the amount of cement in all the mixing water in a concrete mixer for 1-2 minutes. Then load the rest of the cement and aggregate. Preliminary dissolution in water mixing with superplasticizer leads to the formation of a colloidal solution containing an increased amount of micro- and nanoparticles. When a superplasticizer is introduced into a cement-water suspension, particles with a high degree of dispersion are formed, as well as calcium hydrosilicate cristolites with a size of 1-3 nm. This sharply increases the activity of the superplasticizer and, consequently, improves the mobility of the concrete mixture. For example, from P2 to P3, from P3 to P5. This allows to reduce the consumption of the additive by 1.5 - 2 times. It has been established that the superplasticizer can be adsorbed only on hydrate neoplasms. For pre-treatment, it is necessary to use special equipment with high energy consumption such as RPA, fine grinding mills, disintegrators and various activators. Obtaining a cement-water suspension can be carried out in mortar, concrete mixers, in mixers of any type. The concrete mixture consists of cement, crushed stone, sand, water and superplasticizer C-3, determination of the draft of the cone using the Abrams cone, determination of the cubic strength using a hydraulic press in accordance with GOST 10180-2012. It becomes possible to increase the grade in terms of workability as a result of preliminary hydroactivation of the plasticizing additive, which leads to a decrease in its consumption. This method of hydroactivation of superplasticizers for the manufacture of cement concretes can be used to save the consumption of a plasticizing additive.

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Effect of modifiers and mineral additives from industrial waste on the quality of aerated concrete products

Cited by 2 publications

References 6 publications

Study of cement binders applicable for modified cast-in-place concrete

Study of cement binders applicable for modified cast-in-place concrete

The use of superplasticizers in multicomponent concrete mixtures

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