The Effect of Carbon Black and Silica Fume on the Properties of Self-Compacting Concrete

Karpova, Ekaterina; Yakovlev, Grigory; Averkiev, I. K.; Volkov, M. A.; Kuzmina, Natalia V.; KNYAZEVA, S.A.

doi:10.31659/0585-430x-2022-809-12-45-51

Stroitel'nye Materialy

2022

DOI: 10.31659/0585-430x-2022-809-12-45-51

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The Effect of Carbon Black and Silica Fume on the Properties of Self-Compacting Concrete

Ekaterina Karpova

Grigory Yakovlev

I. K. Averkiev

et al.

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2024

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Cited by 2 publications

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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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Properties of concrete with brick waste aggregate

Jabbarova,

Najafova,

Gahramanly

2024

Construction Materials

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Prospects for the bottom ash from hydraulic removal use if in dry building mixtures. Part 2

Petropavlovskii,

Novichenkova,

Petropavlovskaya

et al. 2024

Construction Materials

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Improving the quality of construction gypsum mixtures will be determined by a number of their advantages, which determine their performance characteristics. This makes it possible to solve a number of problems related to creating a comfortable living environment, reducing the carbon footprint, ensuring energy efficiency of construction technologies and constructed facilities without damaging the environment. These problems can be solved by recycling waste from thermal power plants and products based on them in the production of modified gypsum general construction mixtures. The article examines the possibilities of using activated carbon fractions isolated from hydraulic ash waste to improve the performance properties of gypsum dry building mixtures. An overview of existing methods of using ash and slag waste in the production of binders and their disadvantages is presented. The need for innovative methods for assessing and selecting the granulometric composition of modified mixtures is substantiated. The granulometric composition of the original gypsum binder and isolated carbon fractions, which have a special internal structure, are studied. Experimental results show that modified gypsum mixtures with a carbon modifier and a selected granulometric composition provide high quality materials based on them. The work represents a valuable contribution to the use of carbon fractions of hydraulic ash waste in the production of building mixtures, opening up new opportunities for the effective processing of ash and slag waste from thermal power plants and protection from man-made pollution of the natural environment.

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The Effect of Carbon Black and Silica Fume on the Properties of Self-Compacting Concrete

Cited by 2 publications

References 0 publications

Properties of concrete with brick waste aggregate

Properties of concrete with brick waste aggregate

Prospects for the bottom ash from hydraulic removal use if in dry building mixtures. Part 2

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