Development of the theory of the early strength of cement stone and concrete and mechanisms of their primary structure
DOI:
https://doi.org/10.15587/1729-4061.2012.4638Keywords:
concrete, cement stone, the early strength, superplasticizer, structure.Abstract
On the basis of the fundamental positions of colloid chemistry and physical and chemical mechanics of disperse systems the theoretical substantiation of increase of early strength of concrete using the optimal composition with addition of superplasti-cizer and complex accelerator of hardening was done. The analysis of influence of the complex additive to a primary structure of the cement stone and nature of the contacts between products of cement hydration was done. That was also found out that superplasticizer selectively adsorbed on the surfaces of C3A of cement particles, provides water-reducing effect, on the initial stage of hardening prevents the forma-tion of ettringite and increases the number of contacts between electroheteroheneous contacts between crystallohydrates of portlandite and hydrosilicate gel. In a result of the research it was developed concrete composition that provides the producing of concrete sleepers without steaming with obtaining transfer strength of 32 MPa in 12−16 hours of hardening in natural conditions.References
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Copyright (c) 2014 Александр Валерьевич Романенко, Андрей Аркадьевич Плугин, Аркадий Николаевич Плугин, Олег Анатольевич Калинин, Алексей Андреевич Плугин
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