This paper studied lime mortars containing waste brick powder. The powder originates from grinding of thermal insulating bricks. The aim of the study is to find out appropriate application of this secondary raw material. For this purpose we tried to replace silica sand by the brick powder in different quantities (10%, 30% and 50% of weight). An influence of the brick powder replacement is determined through the properties of special mortars, which were compared with a pure lime mortar (with no powder replacement). Specifically in this article experimental methods and results of basic physical properties, pore structure characterization, mechanical properties and hydric transport abilities (water vapour as well as liquid water transport) are described.

This study is aimed at the evaluation of the behaviour of Portland cement based composites reinforced by ceramic fibres when exposed to higher temperatures. The main emphasis is given on the determination of influence of ceramic fibres, which are added in order to improve the post-heating maintenance of mechanical properties of studied composites. Ceramic fibres are, thanks to its origin, predestined to have good resistance to fire and high temperatures. Their influence is investigated through the way of experimental measurement performed on three mixtures varying in the amount of used fibres. Also reference composites without reinforcement are tested. Two sets of each material are made and exposed to different temperature conditions. Loading temperatures are set as 105°C and 400°C and studied properties are basic physical properties, mechanical parameters, liquid transport properties and diffusion characteristics. Results generally prove the beneficial effects of ceramic fibres on the mechanical properties and on the overall behaviour of the composites for both prior and post heating state.