Additive for Autoclave Aerated Concrete with Quick-Slaking Lime

Кузнецова, Г. В.; Морозова, Н Н

doi:10.31659/0585-430x-2020-784-9-4-8

Cited by 3 publications

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“…В России в настоящее время получила широкое распространение традиционная технология с использованием известково-кремнеземистого вяжущего и песка. Производство обладает высокой степенью автоматизации и возможностью применения различных сырьевых материалов, в том числе отходов промышленности [1,2,3,4,5,6]. В качестве отходов в основном используют силикатную составляющую -золошлаковое вторичное сырье, в качестве известковой составляющей -различные виды извести.…”

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“…1), которая позволяет систематизировать научные данные о его составе, свойствах с целью направленного использования в технологиях производства строительных материалов, в том числе для производства силикатных изделий. Правильный выбор исходного сырья и разработка инновационных технологических процессов изготовления строительных материалов вносят заметный вклад в решение проблемы ресурсо-и энергосбережения в строительной отрасли России [10,11,12].…”

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Silicate brick production using anhydrite raw material

Anikanova

2024

Vestnik Tomskogo gosudarstvennogo arhitekturno-stroitelnogo uni

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Purpose: The aim of this work is to substantiate recycling of anhydrite raw materials for the production of silicate products and the development of methods for preparing source materials, compositions and process modes.Methodology/approach: Selection and research of basic materials, methods of their preparation for the production of silicate products; justification of process methods and assessment of quality parameters of materials with the required properties.Research findings: The possibility of utilizing acid fluoride during the synthesis of calcareous-siliceous binder used to produce silicate bricks during autoclave processing. The obtained sand-lime brick samples possess the following physical and mechanical properties: 1750 to 1900 kg/m3 average density, 10 to 12.5 MPa compressive strength, 16 or 17 % water absorption. The samples meet the requirements for sand-lime bricks, namely strength, density, water absorption and correspond to grades 100 and 125.Practical implications: The process modes of autoclaving are detected and the main operational characteristics of sand-lime brick are determined. Methods proposed for preparing raw materials and process conditions of silicate wall materials allow solving environmental problems and saving natural limestone raw materials.Novelty: Sand-lime brick production is based on anhydrite raw materials; suggested dependencies make it possible to control the composition and properties of silicate materials.

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Silicate brick production using anhydrite raw material

Anikanova

2024

Vestnik Tomskogo gosudarstvennogo arhitekturno-stroitelnogo uni

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Cementless concretes, based on anthropogenic wastes of the Irkutsk Oblast

Vabishevich,

Makarenko,

Khokhryakov

et al. 2024

jour

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The accepted global trend of transition from a linear economy to a closed-loop one stimulated the development of regulatory documents, such as “Strategy for the development of building materials in the Russian Federation and Irkutsk Oblast”, Decree of the Government of the Russian Federation dated 08/02/2023 No. 2094, both at federal and regional levels. Further, the Baikal interregional scientific and educational centre was established. All this aims at obtaining technologies for developing effective building materials, based on technogenic wastes, and establishing the production. It is planned to obtain effective building materials, based on the accumulated high-tonnage waste of the Usolye-Sibirskoye priority development area, such as ash and slag mixtures of the combined heat and power plant (90 million tons) and lime-containing waste, generated during the production of acetylene at the Khimprom PJSC (more than nine million tons). The paper represents a fundamentally new approach to obtaining artificially synthesised newgrowths of cementless concrete, based on technogenic wastes, which meets the requirements of regulatory standards in terms of frost and water resistance and allows using this concrete in enclosing structures. At a rationally selected ratio between lime-containing wastes and an ash-slag mixture, subject to the pre-established principles of technological preparation in terms of their mechanical activation, mixing technology, conditions and synthesis duration, it is possible to obtain high-quality cementless concrete that meets the basic requirements of regulatory documents for quality indicators.

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Properties of concrete with brick waste aggregate

Jabbarova,

Najafova,

Gahramanly

2024

Construction Materials

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The properties of concrete with brick waste aggregate are considered and it is established that as the amount of large aggregates - brick waste - increases, an increase in the water-cement ratio is observed. The mobility of concrete with a brick waste content of 50% corresponds to class P1, at 40% – P2, at 35% – class P3. Increased water consumption is necessary due to the effect of water absorption of porous brick chips, as well as maintaining the mobility of the concrete mixture, which changes significantly quickly over time. The initial settlement of the concrete mixture cone is 14–15 cm, after 40 minutes it decreases to 3–6 cm, and after 1 hour the mixture completely hardens. An increase in the content of coarse fillers leads to a decrease in the compressive strength of ceramic concrete. Thus, concrete samples with a filler content of 35% can be classified as class B27.5, samples with 40% – to B25, and 50% – to class B22.5. Electron microscopy was used to study the contact zone “cement stone – aggregate” on samples with crushed stone from brick waste and crushed granite aggregate. The results revealed that the adhesion strength of the aggregate to the cement stone is significantly higher than the strength of the aggregate itself, and the high surface roughness of lightweight secondary aggregates from broken bricks ensures good adhesion between the cement stone and the aggregate. In addition, the increased deformability of the aggregate reduces the negative impact on the shrinkage of cement stone, which has a positive effect on the structure of concrete, preventing the appearance of shrinkage microcracks.

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Additive for Autoclave Aerated Concrete with Quick-Slaking Lime

Cited by 3 publications

References 0 publications

Silicate brick production using anhydrite raw material

Silicate brick production using anhydrite raw material

Cementless concretes, based on anthropogenic wastes of the Irkutsk Oblast

Properties of concrete with brick waste aggregate

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