Methods of increasing the initial strength of winter concrete

• Published in: IOP conference series. Materials Science and Engineering 2018-12, Vol.451 (1), p.12083
• Main Authors: Brzhanov, R T, Pikus, G A, Traykova, M
• Format: Article
• Language: English
• Subjects: Bonding strength; Cement hydration; Concrete; Concreting; Freezing; Hydration; Minerals; Neoplasms; Vibration
• ISSN: 1757-8981; 1757-899X; 1757-899X
• DOI: 10.1088/1757-899X/451/1/012083

The article analyses the stages of hardening and reaction of cement hydration. The relationship between the rate of hydration of cement minerals and the initial strength of concrete has been established. The initial strength of concrete plays a very important role in winter concreting. From the strength of concrete to freezing depends the course of destructive processes in solid concrete. Minerals, the products of cement hydration, have a different rate of formation and different strength. So, weak minerals are formed at the very beginning of hardening and have a low strength. And these weak minerals of cement screen inhibit the formation of stronger minerals. The technological method of destruction of weak bonds of cement minerals is re-vibrating the concrete mixture. Repeated vibration will destroy these new formations of cement, with the possibility of the formation of more durable minerals of cement. The number of weak neoplasms during the hydration of cement depends on its mineralogical composition. The period and intensity of re-vibrating to optimize the strength of winter concrete is set individually, depending on the type of cement and climatic conditions of construction. The results of comparative experiments on the influence of the amount of vibration of a concrete mixture on the strength of winter concrete are presented.