The mortar mixes should have certain rheological properties such as fluidity, stability, and viscosity, which affect and define the workability, pumpability, self-leveling, and compacting. This work is a part of an extended study of, and its purpose is to better understand the behavior of lightweight mortars containing lightweight aggregates and admixtures in order to optimize mortars properties. It is shown how the composition complying with specified requirements-and the best based on several properties-has been found. This porous filler increases the strength while decreasing the density of the mortars. The fine perlite has turned out to have the greatest positive effect on the properties. The obtained models have allowed the individual and synergetic effects of mix components to be evaluated. The effective viscosity and thixotropy of the mix, compression, tensile, adhesive strength, frost resistance, and density of hardened mortars were determined for 18 compositions according to the experiment design. The quantities of fine limestone and perlite as well as of the hydroxyethyl methyl cellulose and dispersible polymer were varied in the experiment.
The purpose of this study was to obtain the experimental–statistical models based on the results of the designed experiment, allowing the influence of light fillers and polymer admixtures on the properties of the mortars to be evaluated and analysed the compositions complying with specified requirements and compromised optimally by a number of properties should be found. The influence of the components of plaster mortars on their properties is considered in a lot of studies at a qualitative level without searching for optimal compositions of these multicomponent composite materials.
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