Design of slag cement, activated by Na (K) salts of strong acids, for concrete reinforced with steel fittings

Kryvenko, Pavlo; Rudenko, Igor; Konstantynovskyi, Oleksandr

doi:10.15587/1729-4061.2020.217002

Cited by 17 publications

(10 citation statements)

References 64 publications

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“…Compressive strength of AASC concrete, based on sodium metasilicate and mixed with seawater, is on 10.9 % greater comparing with one mixed with water (45.8 and 41.3 МPа agreeably). Enhancement of AASC fine concrete strength while mixing with seawater comparing with one mixed with water is caused by effect of SSA's [30,33,34].…”

Section: Effectiveness Of Complex Additive In Alkaliactivated Slag Cement Plasticized Fine Concretementioning

confidence: 99%

“…Seawater can be used as an activator of GBFS's hydraulic properties [26,27,28]. This phenomena is caused by salts of strong acids (further, SSA's), like chlorides and sulfates, dissolved in seawater [29,30]. At that, seawater ensures increasing of AASC concrete consistency [31] and concrete strength [32] that is explained by effect of SSA's [33,34].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effectiveness Of Complex Additive In Alkaliactivated Slag Cement Plasticized Fine Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Production of high-quality materials, determination of their properties today special attention is paid [1][2][3][4][5][6]. The full technological cycle is characteristic feature of the production of hardwood timber blanks in Ukraine -from round timber to finished intermediate products of final moisture content, since the manufacturing of such products from industrial wood is low cost-effective.…”

Section: Introductionmentioning

confidence: 99%

Ways to increase the production efficiency of hardwood blanks

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The article presents the main results of experimental studies on the identification of the main grade defects of oak lumber by the thermal non-destructive testing method. Regressional dependences of wood defects temperature display from the main factors for the studied grade defects are proposed. Indicators of infrared radiation (temperature range) of the main visible oak grade defects obtained as a result of experimental studies are presented. A conceptual scheme for the line control methods of identification of the main grade defects in lumber are proposed.

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“…Increasing the durability of building structures is a relevant global trend in modern materials science. Numerous studies on improving the durability of brick [1], steel [2], wooden [3], concrete [4], reinforced concrete [5] structures, etc. are a confirmation of this trend.…”

Section: Introductionmentioning

confidence: 99%

Comparison of influence of surfactants on thermokinetic characteristics of alkali-activated slag cement

Kryvenko

Rudenko

Konstantynovskyi

2021

EEJET

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Increasing the durability of concrete and reinforced concrete structures according to the criterion of crack resistance is a relevant task of construction materials science. To solve this task, this paper proposes effective solutions for adjusting thermofinite characteristics of alkali-activated slag cement (ASC) by using surfactants of various chemical nature in order to control the thermally-stressed state of concrete based on it (ASC concrete). The method of calorimetry was applied to show that the problematic issue is to adjust the structure formation of ASC by anion-active surface-active substances based on complex polyesters. This is predetermined by the instability of the molecular structure of surfactants in the hydration environment of ASC due to the destruction of complex ester bonds as a result of alkaline hydrolysis. Thermokinetic analysis has demonstrated the effectiveness of using anion-active surfactants, which do not contain ester bonds, as regulators of crack resistance of ASC concrete. Simple polyesters and multi-atom alcohols provide the ability to adjust the duration of the induction period while ensuring the required completeness of ASC hydration within a time frame. The effectiveness of cation-active surface-active substances has been shown, which are characterized by the stability of the molecular structure in the hydration environment of ASC and an increased level of adsorbing capacity. The decrease in the effectiveness of surface-active substances has been shown, in terms of the effect on the heat release of ASC, in the following series: alkaline salt of carboxylic acid>salt of the quaternary ammonium compound>simple polyester> polyalcohol>complex polyester. The reported results are important in view of the possibility of effective adjustment of ASC heat release by influencing the structure formation of surfactant with a certain molecular arrangement in order to predictably reduce crack formation in a thermally-stressed state and a corresponding increase in the durability of structures

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Design of slag cement, activated by Na (K) salts of strong acids, for concrete reinforced with steel fittings

Cited by 17 publications

References 64 publications

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

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

Ways to increase the production efficiency of hardwood blanks

Comparison of influence of surfactants on thermokinetic characteristics of alkali-activated slag cement

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