Innovative building materials in creation an architectural environment

Abyzov, Vadym; Pushkarova, Kateryna; Кочевих, Марина Олександрівна; Honchar, O. A.; Bazeliuk, N. L.

doi:10.1088/1757-899x/907/1/012035

Cited by 15 publications

(17 citation statements)

References 1 publication

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“…1 Константиновский А.П., к.т.н., доцент, alexandrkp@gmail.com, ОRCID: 0000-0002-7936-5699 1 Бойко О.В., аспирантка, м.н.с., olia.bojkoyt@gmail.com, ORCID: 0000-0001-7521-0166 1 Научно-исследовательский институт вяжущих материалов им. В.Д.…”

Section: повышение защитных свойств шлакощелочного бетона к стальной арматуре при затворении морской водойunclassified

Enhancement of Steel Reinforcement Propection in Alkali-Activated Slag Cement Concrete Mixed With Seawater

Krivenko¹,

Rudenko²,

Konstantynovskyi³

et al. 2021

BOSACEA

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Modern trends in construction industry in terms of efficient use of raw materials and energy, implying a responsible attitude to environment, predetermine application of alkali-activated slag cement concrete (further, AASC concrete). It’s well-known the increased risk of steel reinforcement corrosion is caused by mixing concretes with seawater, presented by chlorides and sulfates. One of the benefits of AASC concrete is possibility to be mixed with seawater. The aim of this research was the enhancement of AASC concrete’s protective properties, mixed with seawater, to steel reinforcement due to modification by complex of additives (further, CA), including portland cement, calcium aluminate cement and clinoptilolite. Kuzel’s salt (3CaO∙Al2O3∙0,5CaCl2∙0,5SO4∙10H2O) was fixed in hydration products of AASC, modified by proposed CA, after 180 d of hydration. Formation of mentioned salt is due to chemical binding of Cl- and SO42- ions by calcium hydroaluminate 3CaO∙Al2O3∙10H2O, formed by co-acting of Portland cement and calcium aluminate cement during hydration process. Clinoptilolite enhances occlusion function of hydrates presented by alkaline hydro-alumina-silicates. State of steel reinforcement, evaluated according to DSTU B V.2.6-181:2011, confirms the effectiveness of CA in plasticized AASC concrete, mixed with seawater. Mass loss of steel rebars, which were reached from AASC concrete, modified by high-plasticizing additive of sodium lignosulphonate, was in compliance with mandatory requirements (no more than 10 g/m2). This fact is evidence of corrosion absence. Obtained results confirm mitigation of steel reinforcement corrosion risk in plasticized AASC concrete, modified by CA and mixed with seawater. This phenomenon is caused by binding of Cl- and SO42- ions due to chemical adsorption by gel-like phases, chemical binding in Kuzel`s salt as well as their occluding by zeolite-containing admixture and alkaline hydro-alumina-silicates. In addition, increased strength of AASC concrete, while mixing with seawater, is caused by both water-reducing effect of salts of strong acids and densification of artificial stone microstructure under their influence.

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Enhancement of Steel Reinforcement Propection in Alkali-Activated Slag Cement Concrete Mixed With Seawater

Krivenko¹,

Rudenko²,

Konstantynovskyi³

et al. 2021

BOSACEA

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“…The actuality of green materials implementation is due to their conformity with modern tendencies in construction engineering concerning efficient consumption of raw materials and energy resources [1], as well as responsible attitude to ecology of the environment [2]. Cements, which contain inorganic additives, fully comply modern tendencies for sustainable development of mankind [3].…”

Section: Introductionmentioning

confidence: 99%

“…Content of CAD was 10.00 % by mass of AASC. Contents of CAD components, %: (portland cement + calcium aluminate cement) -5, clinoptilolite -5.The ratio between portland cement and calcium aluminate cement was 2.17:1.00 taking into account formation of 3CaO•Al 2 O 3 •10H 2 O according to reaction(1).…”

mentioning

confidence: 99%

Prevention of steel reinforcement corrosion in alkali-activated slag cement concrete mixed with seawater

et al. 2021

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Concretes mixed with seawater are characterised by enhanced performances, but action of chlorides and sulfates ensures the risk of reinforcement corrosion. Application of high consistency fresh concretes ensures changes in hardened concrete structure that causes the problem of steel reinforcement passive state ensuring. Thus mixing of plasticized concretes by seawater actualizes the search for means of steel corrosion prevention. Alkali-activated slag cements (further, AASC’s) reduce effect of ions Cl− and SO42− on steel reinforcement in concrete due to their exchange for ions OH− in the structure of zeolite-like alkaline hydroaluminosilicates. Complex additive «portland cement - calcium aluminate cement - clinoptilolite» was proposed to enhance the protective properties of AASC concretes to steel reinforcement. The results of DTA, X-ray diffraction, electron microscopy, microprobe analysis show that complex additive ensures to prevent steel reinforcement corrosion in AASC concrete mixed with seawater due to binding Cl− and SO42− ions in Kuzel’s salt in AASC hydration products and exchange of these aggressive ions with OH− ions in the structure of clinoptilolite. This effect of complex additive confirmed by surface state and the absence of mass loss of steel rebars embedded in plasticized AASC fine concrete mixed with seawater after 90 d of hardening.

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“…In accordance with the requirements of the Paris Agreement under the UN Framework Convention on Climate Change (UNFCCC) to regulate measures to reduce carbon dioxide emissions in construction, low-carbon ecocements will become increasingly important [1,2]. As a result of the ecological action of the cement industry in the direction of sustainable development, such low-carbon cements due to the choice of appropriate combinations of components become an alternative to conventional Portland cements [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Suitability of modified low carbon Roman cements for architectural restoration

et al. 2021

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Article is devoted to the investigation of suitability of low carbon Roman cement for restoration and finishing works. The history of the development of Roman cement as a natural hydraulic binder, which was commonly used to decorate building facades in the 19th and early 20th centuries, is presented. The properties of mortars based on Roman cement make it an excellent product for architectural restoration and conservation, as they are characterized by fast setting, high porosity typical for lime mortars, high resistance to weather conditions, high initial strength. At the same time, due to the high surface activity and increased water demand for cement, with the age of hardening, shrinkage deformations can develop, which leads to the formation of main cracks on the surface of the products. It is shown that the addition of gypsum is an effective regulator of the setting time of Roman cement and contributes to an increase in the strength of the cement paste. Analogs of Roman cement based on multicomponent cement binders modified with plasticizing and air-entraining additives are presented.

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Innovative building materials in creation an architectural environment

Cited by 15 publications

References 1 publication

Enhancement of Steel Reinforcement Propection in Alkali-Activated Slag Cement Concrete Mixed With Seawater

Enhancement of Steel Reinforcement Propection in Alkali-Activated Slag Cement Concrete Mixed With Seawater

Prevention of steel reinforcement corrosion in alkali-activated slag cement concrete mixed with seawater

Suitability of modified low carbon Roman cements for architectural restoration

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