The use decorative concretes with the addition of highly dispersed chalk for volumetric and spatial elements of urban space

Chepurna, Svitlana; Popova, Olha; Ryshchenko, Tetiana; Dudka, Olena

doi:10.1088/1757-899x/1164/1/012018

Cited by 1 publication

(8 citation statements)

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“…The formed dense structure with high covalent bonds is provided a decrease in the effective diffusion coefficient of aggressive ions. In addition, corrosion products are formed in the near-surface layer, which have clogged the pores and additionally prevent the penetration of aggressive substances (sulfate ions, magnesium ions, chlorine ions) are deeped into the concrete structures [8].…”

Section: Discussion Of Results Obtained In the Studymentioning

confidence: 99%

“…For create decorate concrete bright saturated colors are used mineral, synthetic or natural pigments. In decorated concrete mineral, synthetic pigments should not exceed 15% and natural pigments are no more than 0.5% [1,8,12]. Pigments should be ensured combination of lightfastness, durability, compatibility with cement, besides being economical.…”

Section: а) B)mentioning

confidence: 99%

“…Figure 2 Electron microscopic image of the surface of natural chalk ((Sloviansk field, Ukraine): а, б -increasing in 5000 [8,22] Chalk contains cations included in the composition of most clinker minerals. The surface of chalk in water dispersion has excess negative charge moreover, a smaller negative potential is matched the equipotential point of chalk which is pH from 5 to 7 [11].…”

Section: а) B)mentioning

confidence: 99%

“…The surface of chalk in water dispersion has excess negative charge moreover, a smaller negative potential is matched the equipotential point of chalk which is pH from 5 to 7 [11]. This is explained by the fact that, according to [8], the chalk surface is covered with an amorphous form of silica; therefore, the mechanism of interaction of chalk with clinker minerals and their hydration products differs significantly from the known mechanisms of interaction of other carbonate rocks.…”

Section: а) B)mentioning

confidence: 99%

“…Therefore, in order to release and start the interaction of the carbonate component of chalk, free silicic acid must be connected with stable products. Moreover, it is leaded to a displacement of strength characteristics and is provided an increase in frost resistance, sulfate resistance and water resistance [3,6,8].…”

Section: а) B)mentioning

confidence: 99%

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Increase in physical and mechanical properties of decorative concretes for the post‐war restoration of residential and public buildings in the Kharkiv region with the addition of highly dispersed calcite (chalk)

Chepurna,

Dudka,

Chepurnyi

2023

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During the war active, a huge number of residential and public buildings were destroyed not only in Kharkiv and the region, but throughout Ukraine. For the restoration of destroyed buildings, new types of cement will be needed to look for and will be created decorated concretes based on them that would provide high operational and technological properties of constrictions and will be focused on local materials. Carbonate additive such as highly dispersed calcite (chalk) can be used for as local additive for concrete due to significant reserves are located in Kharkiv region. In the article research on the impact of joint action additive of highly dispersed calcite (chalk) and natural pigment (ocher) is presented by physical and mechanical properties such as density, strength, water resistance, and frost resistance. It has been established that, depending on the percentage of highly dispersed calcite (chalk), the physical and mechanical properties are changed irregularly. On the basis of the conducted researches it was established that the optimal amount of the addition of high‐fossil chalk, which provides increased frost resistance and corrosion resistance of concrete in an aggressive environment, containing chlorides, sulfates and magnesium ions, is from 10 % to 30 %. In addition, it increases density, compressive strength, stretching strength at bending. At the same time, it should be noted at an increased amount of fine chalk to 40% leads to a decrease in physical and mechanical characteristics. But the introduction of plasticizer in the amount of 0.5% leads to increased compressive strength and, accordingly, increases the positive qualities of chalk. The concrete compositions that getting with high decorative and operational properties are allowed to use them for the restoration of the city and increase in urban space.

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Section: Discussion Of Results Obtained In the Studymentioning

confidence: 99%

Section: а) B)mentioning

confidence: 99%