Abstract
The article presents studies of cement-ash binder in the composition of concrete with the use of complex modified additive (CMD). The research aims to improve the conditions of concrete works production, in particular, to improve the workability of concrete mixture based on ash-cement binders. The main evaluation criterion of the research was the change in the viscosity of the composition when changing the water-binder ratio. The measurements were made in two phases: the first one evaluated the effect of the ash component on the water-binder ratio and the second one dealt with the viscosity change over time. Laboratory tests were carried out with the adapted methods for measuring the flow of the mixture and the determination of the setting time. According to the results of the first stage, patterns of changes in the viscosity of the mixture by changing the water content were obtained, the optimum ratio of water to binder depending on the percentage of the ash component was obtained. According to the results of the second stage, patterns of viscosity changes (from liquid to solid state) of the mixture according to curing time, depending on the same percentage ratio of ash are obtained. In conclusion, data on the optimum water-binder ratio are given from the conditions of ash-cement mixture displaying textotropic properties corresponding to the classical cement mixture without ash inclusion