Development of a complex additive for bored pile production

The article presents the results of the effect of the additive on water resistance, frost resistance and workability, which are one of the main indicators of the physical and mechanical properties of concrete. In the presented work the authors used a complex additive containing alkali (caustic soda), post-alcohol bard and hardening regulator (gypsum) in different % ratios. It is shown that the use of a complex additive in the composition of concrete significantly increases the water resistance and frost resistance compared with the control samples. The influence of the complex additive on the workability of concrete mixture has been studied. It has been established that the complex additive allows obtaining highly workable concrete mixtures and reducing their water separation, providing high preservation of concrete mixtures. The water impermeability of concrete is also significantly improved - the water impermeability grade increases by 4 steps in comparison with the concrete without additive. The proposed method speeds up the process of determining the concrete water impermeability grade and allows you to determine the water resistance grade and the degree of permeability of concrete on the basis of the obtained dependencies. When adding a complex additive in an amount of up to 7 % of the weight of cement increases the brand on frost resistance. It is found that the concrete with the studied complex additive has high physical and mechanical properties. The optimum dosages of the considered additive were found and used in the present work.

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