Research on the Effect of Post-alcohol Bard on the Properties of the Cement-Sand Mixture

The article shows part of the research results of the components of foam concrete made by the two-stage injection of foam, in particular the effect of post-alcohol bard (one of the components of the modified additive of foam concrete production) on the physical and mechanical characteristics. Performed a comparative study of the effect of additives on changes in setting time. The analysis suggests that the additive in the optimal amount leads to changes in the setting time compared with the reference sample. To evaluate the changes in strength, specimens were made and tested in compression and bending at 7, 14, and 28 days of normal-moist hardening. The results of the experiment showed that the introduction of additives – plasticizers (post-alcohol bard) reduce the amount of water to 35%, increasing the strength of concrete by 20%. Compressive and bending strength results of the modified samples showed the best results, which were in the range of 510.81–562.98 and 68.91–75.91 kgf/cm2, compared with the control composition. The results of the experiment showed that from the standpoint of improving the qualitative characteristics of the samples, the use of plasticizers is appropriate. The additive showed optimum positive effect, so the use of this percentage of additive (2.5–10%) is the most effective to increase the compressive and bending strength of concrete. Such high values on the strength of the specimens allow us to count on their high reliability.