Increasing the Strength of Heavy Concrete With Use of Dispersed Mineral Additives

Ilina, L.; Berdov, G.I.; Gichko, N.O.

doi:10.53980/24131997_2023_1_66

Cited by 1 publication

(3 citation statements)

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“…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%

“…Due to additions should be been enough close to according to its composition, according to the type of chemical connections, physical and chemical characteristics (specific enthalpy of formations, specific entropy, etc.) in relation to binders and hydration products [3]. It should be noted that the amount of mineral additions introduced varies from a fraction of a percent to several tens of percent of the mass of the binder [4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…The addition -thinners have a weak hydraulic or pozzolanic properties under normal hardening conditions, improve the grain composition of the cement and the structure of the cement stone. The addition that fills in the space between cement grains is participated in the process of hydration and hardening of cement but interaction with the products of hydration is happened enough slowly [3].…”

Section: Introductionmentioning

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

ce papers

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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: а) B)mentioning

confidence: 99%