Composite Binder on the Basis of Concrete Scrap

Lesovik, R. V.; Tolypina, N. M.; Ahmed, A.; Jasim, Al-bo-ali-wathiq Saeed

doi:10.1007/978-3-030-54652-6_46

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…Полифракционный гранулометрический состав многокомпонентной смеси способствует образованию полидисперсной структуры, в которой более мелкие частицы располагаются в пустотах крупных частиц, при этом обеспечивается минимизация пустотности пылевидной фракции, что положительно влияет на прочность образцов мелкозернистого бетона [3][4][5][6][7]. На практике пористая структура бетона устраняется увеличением расхода цемента либо вводом тонкодисперсных наполнителей, что обеспечивает заполнение пор новообразованиями или тонкодисперсными частицами наполнителя [8][9][10][11]. Однако выполнение данных требований приводит к удорожанию бетонов, так как стоимость дисперсных наполни-телей может в несколько раз превышать стоимость вяжущего, поэтому поиск дешевых наполнителей является актуальной задачей [12][13][14][15][16][17][18][19][20].…”

Section: влияние полидисперсного бетонного лома 3d-печати на структурообразование бетонаunclassified

The Effect of Polydisperse Concrete Scrap of 3d Printing on the Structure Formation of Concrete

Tolypina

Tolypin

2021

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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The article considers the influence of polydisperse concrete scrap of 3D printing on the structure formation of concrete during its repeated application. It is established that the favorable effect on the strength is due to the presence of thin layers on the surface of the secondary fine aggregate in the form of hydrate phases that enhance adhesion to the forming cement matrix. At the same time, an important multifunctional role is played by a fine fraction consisting of a cement matrix with a small amount of pulverized clinker and quartz. It increases the volume of the binder part; performs the function of the centers of crystallization of hydrate phases; promotes the formation of a compact and homogeneous structure by filling the pores; increases the strength due to the hydration of the minerals alite and belite. It is shown that the minimization of the voidness of the fine-grained part of the concrete scrap is largely due to the polymodal grain composition, which contributes to the optimization of the structure of fine-grained concrete and increases the strength. The features of the microstructure of fine-grained concrete samples are established. Artificial conglomerate based on concrete scrap is characterized by a compact structure, due to the high adhesion of the fine aggregate to the cement matrix of concrete, filling the pores with hydrate phases and fine particles, in contrast to the samples of fine-grained concrete of the control composition, which structure is characterized by a weak contact zone between the aggregate and the cement matrix.

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Section: влияние полидисперсного бетонного лома 3d-печати на структурообразование бетонаunclassified

The Effect of Polydisperse Concrete Scrap of 3d Printing on the Structure Formation of Concrete

Tolypina

Tolypin

2021

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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“…Concrete and reinforced concrete products are not subjected to heat and moisture treatment during the manufacturing process, but harden under a waterproofing film to a grade strength of 28 days in atmospheric conditions (t = 35–50 °C) due to the hot dry climate of Iraq [ 66 ]. During the operation of products, the cement paste is no longer subjected to additional hydration due to the lack of the required amount of moisture [ 67 , 68 ].…”

Section: Introductionmentioning

confidence: 99%

Demolition Waste Potential for Completely Cement-Free Binders

Alani

Lesovik

et al. 2022

Materials

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Due to renovation and fighting in the world, a huge accumulation of construction and demolition waste is formed. These materials are effectively used as aggregates, but there is very little information about the use of scrap concrete to create cementless binders. The purpose of the work is to be a comprehensive study of the composition and properties of concrete wastes of various fractions with the aim of their rational use as cementless binders. The scientific novelty lies in the fact that the nature of the processes of structure formation of a cementless binder based on sandy fractions of the screening of fragments of destroyed buildings and structures, as a complex polyfunctional system, has been theoretically substantiated and experimentally confirmed. Different percentages of non-hydrated clinker minerals in concrete scrap were determined. In the smallest fraction (less than 0.16 mm), more than 20% of alite and belite are present. Waste of the old cement paste is more susceptible to crushing compared to the large aggregate embedded in it, therefore, particles of the old cement paste and fine aggregate predominate in the finer fractions of the waste. Comprehensive microstructural studies have been carried out on the possibility of using concrete scrap as a completely cementless binder using scanning electron microscopy, X-ray diffraction analysis, and differential thermal analysis. It has been established that for cementless samples prepared from the smallest fractions (less than 0.315 mm), the compressive strength is 1.5–2 times higher than for samples from larger fractions. This is due to the increased content of clinker minerals in their composition. The compressive strength of the cementless binder after 28 days (7.8 MPa), as well as the early compressive strength at the age of 1 day after steaming (5.9 MPa), make it possible to effectively use these materials for enclosing building structures.

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Thermokinetic Processes of Hydration of Binders Based on Scrap Concrete

Ahmed

Lesovik

2021

Lecture Notes in Civil Engineering

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Composite Binder on the Basis of Concrete Scrap

Cited by 9 publications

References 5 publications

The Effect of Polydisperse Concrete Scrap of 3d Printing on the Structure Formation of Concrete

The Effect of Polydisperse Concrete Scrap of 3d Printing on the Structure Formation of Concrete

Demolition Waste Potential for Completely Cement-Free Binders

Thermokinetic Processes of Hydration of Binders Based on Scrap Concrete

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