Úprava jílů termickou aktivací a jejich využití v technologii výroby lehkých betonů.

Abstract

The dissertation focus on the partial or complete replacement of silica sand by thermally activated clay as filler for production of light aerated concrete mixtures and partial replacement of cement and lime by thermally activated clay, where its pozzolanic properties are used. The uniqueness of this replacement primarily lies in the low-temperature thermal activation. The thesis contains the process of thermal activation, results of individual characteristics of the resulting masses so that the conclusions reached can be directly interpreted into technical practice. Particular emphasis was placed on visual and microscopic assessment of the achieved results in addition to the typical standardized physical characteristics. Visual assessment of light porous materials is the primary and often the most accurate method of evaluating the properties of highly porous lightweight concrete if the necessary interpretative knowledge is implemented. Another important criterion described in the dissertation thesis is the chemical reaction of lightweight concrete during water exposure, where mainly crystallization or recrystallization of connective tissue that did not participate in the curing reaction are often neglected laboratory tests. These chemical reactions cause serious structural failures. The dissertation also solves the possibility of using a new type of recycled material from construction debris, where recyclates with a high content of ceramic shard are obtained on new types of sorting lines, where the goal of the dissertation was at least basically to verify their possibility in light autoclaved concrete technology.