Investigation of the influence of nanomodifying additives on the strength properties of concrete

Gavrish, Vladimir; Chayka, Tatyana; Baranov, Georgy; Gavrish, Olga

doi:10.1016/j.matpr.2020.08.120

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…A steady growth in the number of studies on climate change, environmental problems, and enhancing the service life of the materials [15][16][17]-especially in the manufacturing and construction sectors-has been observed over the last decade. This is because most of the above-mentioned products are manufactured based on portland cement, the production of which is associated with significant emissions of anthropogenic CO 2 into the atmosphere.…”

Section: Theorymentioning

confidence: 99%

Influence of Forced Carbonisation on the Binding Properties of Sludge with a High β-Belite Content

et al. 2021

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Alternative binders activated by forced carbonisation are regarded as one of the potential solutions to reducing greenhouse gas emissions, water, and energy consumption. Such binders, in particular those based on nepheline sludge (a by-product of alumina production), cured in carbon dioxide with subsequent hydration, are clinkerless building materials. The development of such binders contributes to the involvement of multi-tonnage solid industrial waste in the production cycle. This type of waste is capable of binding man-made CO2 and transforming it into stable insoluble compounds, having binder properties. The optimum technological parameters of the forced carbonisation of the nepheline slime binder was determined by the mathematical planning of the experiment. The novelty of the research is the expansion of the secondary raw material base that can bind the man-made CO2 with obtaining the construction products of appropriate quality. It was revealed that the process of active CO2 absorption by the minerals of nepheline slime is observed in the first 120 min of the forced carbonization. Immediately after carbonisation, the resulting material develops compressive strength up to 57.64 MPa, and at the subsequent hydration within 28 days this figure increases to 68.71 MPa. Calcium carbonate is the main binder that determines the high mechanical properties of the samples. During the subsequent hydration of the uncoated belite, gel-like products are formed, which additionally harden the carbonised matrix. Thus, after the forced carbonisation and the following 28 days of hardening, the material with compressive strength in the range 4.38–68.71 MPa and flexural strength of 3.1–8.9 MPa was obtained. This material was characterised by water absorption by mass in the range of 13.9–23.3% and the average density of 1640–1886 kg/m3. The softening coefficient of the material was 0.51–0.99. The results obtained enables one to consider further prospects for research in this area, in terms of the introduction of additional technological parameters to study the process of forced carbonisation of nepheline slime.

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Section: Theorymentioning

confidence: 99%

Influence of Forced Carbonisation on the Binding Properties of Sludge with a High β-Belite Content

et al. 2021

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“…Currently, concrete mixes with various additives of both mineral and organic origin have found wide application in construction [1][2][3][4][5][6]. The increased amount of the mortar component of concrete mixtures obtained during the preparation process affects their quality and is determined by the type and value of forces arising between the particles of the solid phase and the liquid.…”

Section: Introductionmentioning

confidence: 99%

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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“…This ceramic carbide is also used to enhance the mechanical properties of different composites due to its strength, chemical stability, rigidity, and high-temperature resistance [ 25 ]. WC is a waste product of hard alloy metals [ 26 ], while SiC can also be found as a waste product [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Silicon Carbide and Tungsten Carbide on Concrete Composite

et al. 2022

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Flexural strength of concrete is an important property, especially for pavements. Concrete with higher flexural strength has fewer cracking and durability issues. Researchers use different materials, including fibers, polymers, and admixtures, to increase the flexural strength of concrete. silicon carbide and tungsten carbide are some of the hardest materials on earth. In this research, the mechanical properties of carbide concrete composites were investigated. The silicon carbide and tungsten carbide at different percentages (1%, 2%, 3%, and 4%) by weight of cement along with hybrid silicon carbide and tungsten carbide (2% and 4%) were used to produce eleven mixes of concrete composites. The mechanical tests, including a compressive strength test and flexural strength test, along with the rapid chloride permeability test (RCPT), were conducted. It was concluded that mechanical properties were enhanced by increasing the percentages of both individual and hybrid carbides. The compressive strength was increased by 17% using 4% tungsten carbide, while flexural strength was increased by 39% at 4% tungsten carbide. The significant effect of carbides on flexural strength was also corroborated by ANOVA analysis. The improvement in flexural strength makes both carbides desirable for use in concrete pavement. Additionally, the permeability, the leading cause of durability issues, was reduced considerably by using tungsten carbide. It was concluded that both carbides provide promising results by enhancing the mechanical properties of concrete and are compatible with concrete to produce composites.

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Investigation of the influence of nanomodifying additives on the strength properties of concrete

Cited by 5 publications

References 6 publications

Influence of Forced Carbonisation on the Binding Properties of Sludge with a High β-Belite Content

Influence of Forced Carbonisation on the Binding Properties of Sludge with a High β-Belite Content

The use of superplasticizers in multicomponent concrete mixtures

Effect of Silicon Carbide and Tungsten Carbide on Concrete Composite

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