A Study on Mechanical Properties and Structure of Anhydrite Binder Modified by Ultra-Dispersed Siltstone

Tokarev, Yury; Yakovlev, Grigory; Saidova, Zarina; Грахов, В П; BURYANOV, A.F.; Elrefai, Ali Elsaed Mohamed Mohamed

doi:10.3846/est.2019.11950

Cited by 3 publications

(4 citation statements)

References 16 publications

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Section: Figure 5 Demonstrates High Rheological and Strength Characteristics Of The Developed Composite Binderssupporting

confidence: 89%

“…Crystalline particles of ground quartz sand act as centers of crystallization of new formations. This is confirmed by comparing the results obtained by other authors, for example, Tokarev et al [46]. There is an increase in strength of more than 60% at a cement substitution level of more than 40%.…”

Section: Figure 5 Demonstrates High Rheological and Strength Characteristics Of The Developed Composite Binderssupporting

confidence: 86%

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Increasing the Performance of a Fiber-Reinforced Concrete for Protective Facilities

Fediuk

Amran

Klyuev

et al. 2021

Fibers

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The use of fiber in cement materials is a promising and effective replacement for bar reinforcement. A wide range of fiber-reinforced concretes based on composite binders with increased impact strength characteristics have been developed. The synthesized composites included the composite binder made of Portland cement, silica, and carbonate additives. Basalt and steel were used as fibers. The nature of the influence of the composition and manufacturing technology of cement composites on the dynamic hardening coefficient has been established, while the growth of these indicators is achieved by creating a denser interfacial transition zone between the cement paste, aggregate, and fiber as a result of improving the homogeneity of the concrete mixture and controlling the consistency. Workability indicators (slump flow up to 730 mm; spreading time up to a diameter of 50 cm is up to 3 s) allow them to be classified as self-compacting concrete mixtures. An increase in the values of the impact strength coefficient by a factor of 5.5, the dynamic hardening coefficient by almost 70% as a result of interfacial interaction between fibers and binder matrix in the concrete composite, as well as absorption of impact energy by fiber, was revealed. The formula describing the effect of the loading rate on the coefficient of dynamic hardening of fiber-reinforced concrete has been refined. The fracture processes of the obtained materials have been established: after the initiation of primary cracks, the structure of the composite absorbs impact energy for a long time, while in the inelastic range (the onset of cracking and peak loads), a large number of secondary cracks appear.

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Section: Figure 5 Demonstrates High Rheological and Strength Characteristics Of The Developed Composite Binderssupporting

confidence: 89%

Section: Figure 5 Demonstrates High Rheological and Strength Characteristics Of The Developed Composite Binderssupporting

confidence: 86%

Increasing the Performance of a Fiber-Reinforced Concrete for Protective Facilities

Fediuk

Amran

Klyuev

et al. 2021

Fibers

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“…7). The experimental results showed higher values compared both to natural and thermal anhydrite 26,27 …”

Section: Resultsmentioning

confidence: 86%

“…The experimental results showed higher values compared both to natural and thermal anhydrite. 26,27 The presented strength indicators showed that the selected types of additives contributed to the activation of the material synthesized at 45 °C (with a lamellar form of crystals) but did not activate the anhydrite obtained at 25 °C. This can lead to the conclusion that, depending on the structure, shape, and size of the crystals, the same additives-activators act differently on the material.…”

Section: Binders Based On Synthesized Anhydritementioning

confidence: 99%

Low energy synthesis of anhydrite cement from waste lime mud

Kamarou

Moskovskikh

Chan

et al. 2022

J of Chemical Tech & Biotech

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Background: The re-use of waste is the most important aspect of sustainable development for human health and environmental protection. Millions of tons of hazardous spent sulfuric acid and lime mud are produced by water treatment facilities every year. Unlike other types of waste, lime mud can sometimes be used for the thermal regeneration of lime. However, this approach requires a high energy consumption and, thus, cannot be considered a sustainable or green process. Compared to the latest research, the method presented here allowed for the production of anhydrite in one step at very low temperatures and in a short time while also bypassing the stage of gypsum phase formation.Results: Calcium sulfate anhydrite was synthesized from the water treatment waste of lime mud by a low-temperature method at temperatures of 25 and 45 °С. The resulting samples were composed of anhydrite with different crystal morphologies. This was confirmed by XRD, DTA, SEM, TEM, and thermochemical calculations. Dependences of the influence of the shape of crystals on the main technological properties of anhydrite cement and the influence of additives on the activation of the binding properties were established. Conclusion:The research shows that different types of calcium sulfate anhydrite require different additives and in different amounts. Introducing the optimal composition of additives-activators made it possible to obtain anhydrite cement with a wateranhydrite ratio of 0.25, an onset of setting no earlier than 40 min, an end of setting no later than 12 h, and a strength of 28.8 MPa.

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The Electrical Conductivity of Fluoroanhydrite Compositions Modified at the Nanoscale Level with Carbon Black

Yakovlev

Pervushin

Smirnova

et al. 2020

Environmental and Climate Technologies

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The electrical conductivity of fluoroanhydrite compositions modified with different amounts of ultrafine soot was studied. The optimal ratio of additive and binder was determined in terms of both electrical conductivity and compressive strength. The research results have showed that the addition of ultrafine carbon black in the amount of 7 % by the binder mass had a significant influence on the mechanical properties of the composition as well as its electrical conductivity. The strength of the samples with 7 % of ultrafine carbon black decreased up to 23.9 MPa at the age of 14 days whereas the reference sample strength was 40.1 MPa. At the same time the electrical resistance of the modified samples was 99.65 Ω at the age of 14 days whereas the electrical resistance of the reference samples reached 128.1 kΩ. The developed fluoroanhydrite composition was modified at the nanoscale level with carbon black and it can be used as material for the antistatic and grounding conductive flooring.

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A Study on Mechanical Properties and Structure of Anhydrite Binder Modified by Ultra-Dispersed Siltstone

Cited by 3 publications

References 16 publications

Increasing the Performance of a Fiber-Reinforced Concrete for Protective Facilities

Increasing the Performance of a Fiber-Reinforced Concrete for Protective Facilities

Low energy synthesis of anhydrite cement from waste lime mud

The Electrical Conductivity of Fluoroanhydrite Compositions Modified at the Nanoscale Level with Carbon Black

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