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Regulation of Persistence (Viability) of Concrete Mixtures Using Modern Plasticizing Agents

The paper presents the results of studies the role of modern chemical, mineral and micro-reinforcing additives in the process of structure formation of high-strength concrete. The paper reveals the features of the structure formation of cement stone in the presence of a superplasticizer. The paper experimentally proves that, according to the test results, the best performance on the persistence of concrete mixtures has a superplasticizer «Linamix PC» while this additive has the lowest consumption (1.1% by weight of cement). The specified grade for workability on this type of additive is maintaining for 4-5 hours, and the mixture becomes stiff after 7 hours of mixing, while the concrete grade (P5) is lost after 3 hours. It has been established that the persistence of concrete mixtures can be increased up to 810 hours by using the “Linamix RS” additive jointly with the “Linamix PC” superplasticizer slowing down the mixture hardening rate by 2 times or more, which is very important in continuous monolithic concreting at various construction sites.