Alkali-aggregate reaction in alkali-activated cement concretes

Kryvenko, Pavlo; Gelevera, Oleksandr; Kovalchuk, Oleksandr; Būmanis, Ģirts; Korjakins, Aleksandrs

doi:10.1088/1757-899x/660/1/012002

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…У роботах [10][11][12] у результаті теоретичних та експериментальних досліджень доведено, що завдяки особливому пульсуючому синхронному руху поїздів, режиму струму бетон залізничних споруд також зазнає електрокорозії, яка полягає в його електроміграційному вилуговуванні. Крім того, показано, що такий пульсуючий однонаправлений електричний потенціал (ПОЕП) pf може інтенсифікувати за рахунок електроміграційного перенесення внутрішню корозію бетону від взаємодії луг цементу з реакційно здатними заповнювачами (Alkali-Silica Reaction ASR) [12][13][14][15][16]. Проте в зазначених експериментальних дослідженнях впливу електричного струму піддавали зразки лише бетону.…”

Section: вступunclassified

Experimental Studies of the Influence of Electrical Potentials on Corrosion Processes in Reinforced Concrete Sleeves

Plugin,

Murygin,

Krykun

et al. 2024

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Experimental studies of the influence of electric potentials on the intensity of corrosion processes in reinforced concrete structures of under-rail foundations have been conducted.A research methodology has been developed that involves the creation of these influences on models and the assessment of their consequences. The effects of capillary rise, evaporation, diffusion, crystallization of salts, electric potential have been created, and the impact of electric potential on the acceleration of transfer processes and manifestations of corrosion signs has been estimated.Models and experimental installations were made, research was conducted. The exposure of the models was carried out in an aqueous environment and in a sodium chloride solution without electrical influence (as a control) and under the influence of a pulsating unidirectional electric potential of the PUEP. It was established that the current through the models decreases under the influence of PUEP, and the specific electrical resistance of the models increases. PUEP accelerates the penetration of ions into the model by 4.43 times, and also causes stronger manifestations of signs of electrocorrosion of the armature. As a result of the exposure of the models without electrical influence in the water environment, weak corrosion of the armature outlets was noted, no corrosion of the armature was observed inside the model; in the sodium chloride solution, strong corrosion of the armature outlets and weak corrosion inside the model was observed. As a result of the influence of PUEP in the water environment, weak corrosion of the fittings was observed, inside the model, no corrosion of the fittings was observed; in the sodium chloride solution, weak corrosion of the armature outlets and strong corrosion was observed inside the model. It has been confirmed that the influence of PUEP significantly accelerates the transfer of ions in concrete and intensifies the corrosion processes of reinforcement. Acceleration of ion transport should also accelerate corrosion processes in concrete, but it is advisable to conduct their research with longer exposure periods of models and with the use of physicochemical methods. Means of draining the currents flowing from the rails through the sleepers were recommended and it was suggested to eliminate the armature discharges from their ends.

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Section: вступunclassified

Experimental Studies of the Influence of Electrical Potentials on Corrosion Processes in Reinforced Concrete Sleeves

Plugin,

Murygin,

Krykun

et al. 2024

ЗНПУкрДУЗТ

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“…Assessment of the environmental impact of binders is an important criterion when developing compositions of these binders and selecting the components [39][40][41][42]. The technology of clinker-free cements should combine issues such as saving Portland cement clinker, recycling industrial wastes, and obtaining concrete with new and improved properties [43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Concrete Based on Clinker-Free Cement: Selecting the Functional Unit for Environmental Assessment

et al. 2020

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Improving the environmental situation and obtaining cement composites with new properties for various operating conditions is possible with the use of secondary resources. The paper is devoted to the criteria for evaluating the impact of clinker-free cement on the environment. The methodological approach to the selection of a functional unit for comparative assessment of the ecological footprint of clinker-free cements is justified. The results of studying the properties determining the concrete durability in the aggressive environment of livestock farms and in transport construction are given. The results will contribute to the development of an ecological approach to the components selection for clinker-free cements and to the adoption of design decisions in construction, as well as to the expansion of the field of using clinker-free cements in transport and industrial construction.

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