STUDY OF MODIFIED BINDER FOR PRODUCTION OF AERATED CONCRETE

Abstract

In the case of energy saving, the main direction in the technology of modern wall materials is to reduce the density in order to achieve better thermal performance while simultaneously increasing the strength characteristics, i.e. creation of effective wall materials. One of these materials is aerated concrete, which is successfully used all over the world. One of the ways to increase the physical and mechanical properties of the binder as the main component of aerated concrete and to expand the raw material base can be the use of waste from all kinds of production, as well as the secondary use of damaged building materials from destroyed buildings and structures as a result of hostilities (recycling). The purpose of the research is to obtain aerated concrete on a modified binder using recycling of destroyed building materials. At this stage, a modified binder is being studied. As a result of the research, the optimal ratio of the components of the modified binder (Portland cement, metakaolin, brick mortar) was determined. Mathematical models describing the dependence of the bending and compression strength of the binder on its composition were obtained. The results of X-ray phase and differential thermal analysis show that the introduction of methacoaline and brick mortar additives into the binder based on Portland cement, after 28 days of normal hardening, do not cause new phase and mineralogical formations compared to samples without additives, but only affect the quantitative mineralogical storage. More intensively expressed hydro-silicate phases and a decrease in crystallization calcium hydroxide are observed. The micrographs of the structure of the obtained binder clearly show the monolithic structure of the cement stone, the alkali-dispersed cement grains, sand and calcium hydro-silicate clusters are visible.