Disperse reinforced concrete with polycarboxylate additive on a mechanically activated binder

Ksonshkevych, Liubov; Barabash, I.V.; Krantovska, Olena; Synii, Sergii; Sunak, P O

doi:10.1088/1757-899x/708/1/012092

Cited by 4 publications

(4 citation statements)

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“…Analysis of experimental data indicates that at the age of 28 days the compressive strength of concrete on an activated binder is 2.5 ... 3.5 MPa higher than the strength of concretes of similar composition, prepared using traditional technology. It should be noted that the amount of basalt fiber slightly increases the strength of concrete, which is consistent with the research results [3][4][5]. Using the experimental data shown in table 1, ES-models of the fine-grained concrete composition variables influence on its abrasion were built:…”

Section: Source: Author's Illustrationsupporting

confidence: 85%

“…The factors that hinder the widespread introduction of fine-grained concrete into construction practice are its higher cost compared to ordinary concrete, as well as relatively low mechanical characteristics: compressive strength, wear resistance, shock resistance [2]. A significant reserve for improving the mechanical characteristics of finegrained concrete is its dispersed reinforcement, as well as the mechanical activation of Portland cement due to the use of high-speed mixers in the technology of preparing concrete mixtures [3][4][5][6][7]. It has been established that the introduction of basalt fiber into a fine-grained concrete mixture leads to a decrease in its mobility, which requires an increase in the amount of mixing water [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Fine-grained Fiber Concrete on Mechanoactivated Portlandcement

Vorokhaiev

Barabash

Ksonshkevych

et al. 2021

Croatian Regional Development Journal

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This article is devoted to the study of the mechanical properties of fine-grained concrete used for flooring in industrial and civil buildings. Characterized by the well-known advantages (unlimited raw material base, manufacturability, high homogeneity), fine-grained concrete requires an increased consumption of cement to achieve the necessary mechanical characteristics - compressive strength, abrasion, impact resistance. An alternative to the known technological method is proposed an intensive separate technology (IST) for preparing fine-grained concrete mixtures using a high-speed mixer-activator in the presence of hydrophobized basalt fiber and a polycarboxylate superplasticizer Relaxol-Super PC. The use of IST leads to an increase in the strength of fine-grained concrete in compression by 1.9 times, impact resistance by a factor of 2, and a decrease in abrasion by 40... 50% in comparison with the control. The relevance of using the technology of monolithic floors for industrial and civil construction is due to a wide range of varieties of Portland cement, the grain composition of aggregates, as well as the simplicity of the technology for preparing a fine-grained concrete mixture.

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Section: Source: Author's Illustrationsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Fine-grained Fiber Concrete on Mechanoactivated Portlandcement

Vorokhaiev

Barabash

Ksonshkevych

et al. 2021

Croatian Regional Development Journal

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“…Possessing a number of positive properties associated with the preparation and placement of concrete mix, sandy concretes are characterized by relatively low compressive strength, reduced impact strength, and increased abrasion. Improving of the operating properties of concrete is achieved by reinforcing it with various types of fibers of organic or mineral origin [2][3][4][5].…”

mentioning

confidence: 99%

“…The study of the strength properties of sand concretes using basalt fiber was carried out according to a 2-factor optimal plan. The following composition factors varied: Х 1the amount of water-reducing additive Relaxol -Super PC, 0.8 ± 0.4% of the cement mass; Х 2 -the amount of basalt fiber, 1 ± 1kg/m 3 .…”

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confidence: 99%

Hydrophobization of Basalt Fiber and Its Influence on the Mechanical Characteristics of Sand Concrete

Barabash¹,

Vorokhaiev²,

Ksonshkevуch³

2020

BOSACEA

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Abstract. The materials of the proposed article are devoted to the study of mechanical properties of sand concrete with the addition of hydrophobized basalt fiber and polycarboxylate superplasticizer Relaxol-Super PC. Adding hydrophobic properties to the basalt fiber causes a decrease of water consumption of fine-grained concrete mixture, which leads to improved mechanical properties of concrete. The aim of the work was to increase the mechanical characteristics of sand concrete by introducing hydrophobized basalt fiber into its composition. The objective of the research is to study the effect of hydrophobized basalt fiber on the mechanical characteristics of sand concrete. The polycarboxylate superplasticizer Relaxol-Super PC (Budindustriya, Zaporozhye) was used to increase the mobility of the concrete mixture. Basalt fiber Bauson-basalt 12 mm long and 18 ± 2μm in diameter was used as a fibrous filler. Sand concrete mixture was prepared in a laboratory forced-action mixer. Dosing of Portland cement, quartz sand and basalt fiber was carried out by weight, water and water-reducing additive ‒ by volume, taking into account the density of the additive. The fiber was introduced into a dry cement-sand mixture. After mixing for 120 ... 150 seconds, water with a dosed amount of additive was introduced into the mixture. The hardening of samples concrete took place under normal conditions in a chamber with a temperature of 20 ± 20C and a relative humidity of at least 95%. The compressive strength of concrete was determined by testing the halves of the samples – beams 4×4×16 cm in size at 28 days of age. The abrasion of the investigated concrete was determined by testing cube specimens with an edge of 7.07 cm on an LKI-3 device in accordance with the procedure set forth in DSTU B.V.2.7-212: 2009 “Building materials. Concrete. Methods for determining abrasion “. The impact resistance of concrete was determined from the results of testing cubic specimens with an edge of 7.07 cm on a vertical dynamic laboratory test machine. Especially effective is manifested positive role hydrophobization basalt fiber in combination with the water-reducing additive Relaxol-Super PC. The introduction of hydrophobic fiber (2 kg/m3) and Relaxol – Super PC (1.2% by weight of cement) into the sand concrete mix provides an increase in the strength of sand concrete by 45 ... 48%, impact resistance by 45 ... 50%. The abrasion of concrete is reduced by 36 ... 48% compared to the control.

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