Effect of discrete fibers (mineral, polymeric) on the rheological properties of solutions based on mineral binders

Application as reinforcing components − metal and polypropylene fibers in the manufacture of mixtures for the arrangement of floor elements, which has recently received widespread, does not contribute to reducing the cost of such mixtures. The purpose of the article. To determine the influence of basalt fiber on the rheological properties of cement-sand mixture based on mineral binders. Methods of conducting research. The introduction of basalt fibers was carried out in a dry mixture, after which the mixture was stirred to a maximum homogeneous state, followed by the addition of water. As a criterion for the mobility of soluble mixtures for the flooring, two indicators are used: mobility and spreading. Given the high mobility of the soluble mixtures data, vibration of molds with a mixture was not carried out. The laying of samples took place the next day after the formation. Samples were stored in a bath with a hydraulic shutter for 28 days. The main material. In accordance with the developed planning matrix, a number of experiments were conducted. After statistical processing of the results of the research, regression equations were obtained and diagrams of the mutual influence of the components on the properties of the cement-sand solution were constructed. Water-cement ratio characterizes the mobility of the solution, which in turn determines the scope of its application. The main factors that influence the water-cement ratio are: the content of the components in the mixture, the size of sand or its granulometric composition, the humidity of the filler, as well as the specific surface of the materials. Conclusion. The maximum value of water-cement ratio reaches a maximum fiber content of 0.4 %. The smaller the length of the introduced fiber, the less the effect of the diameter of the fiber on the water-cement ratio of the cement- sand solution. An increase in the length of the basalt fiber leads to a more sharp increase in the ratio of water-cement to the sand solution. A more sharp increase of the indexes of cement-sand solution, due to the increase in the diameter of the reinforcing component, is observed with a fiber content of more than 0.2 %.