The waste tire textile fibers from tires are generated as a by-product and are classified as special waste. To avoid landfilling and incineration of this waste, it is necessary to focus on its further use. This article describes an experimental study of the use of waste tire textile fibers for plaster mixtures. Waste fibers were added in different amounts of 2.9%, 3.6%, and 4.3% related to the weight of cement, the effect of fibers on selected properties was monitored. The results of the experimental work show that the lower addition of waste fibers (2.9% and 3.6%) had a predominantly positive effect on mechanical properties. By exceeding of the optimal dose of fibers, the tested properties of the plasters got worse.
With the growing number of realized thermal insulation systems, fast growing number of buildings with facades attacked by microorganisms occurs. Such surface attack can occur even in the first years after thermal insulation completion, and it can be a serious problem in a very short time. Problem is both in realization and maintaining of thermal insulation, and directly in the used material. The paper presents results of laboratory experiments on resistance to biological attack, carried out for five commercial materials available on the Czech market. Before the experiments, materials were subjected to accelerated ageing for 4 and 10 years. Resistance testing comprises regulated application of algae and mould strains on samples and incubation in a defined environment. Materials resistant after ageing simulation of the longer time period were found as well as materials susceptible to attack already after completion of a facade set.
The paper brings current results of a project that places emphasis on comparison of different fine-grained concrete resistance to influence of aggressive solutions of biogenic or biological origin. For laboratory testing, there were preferentially selected aggressive environments, to which concrete constructions of agricultural structures or sewage networks are exposed. Basic physical-mechanical parameters of concrete samples exposed to aggressive solutions for 1 year are stated in the paper.
Molds attack buildings on a broad scale, cause significant damage and carry a number of negative effects on human health. The design of the methodology is based on EN 60068-2-10 “Environmental Impact Testing – Parts 2-10: Tests – Test J and Instructions: Mold Growth” and ČSN 72 4310 “Testing the Resistance of Building Products and Materials against Mold”. However, the first of these standards is intended for electrical industry and the other was published in 1975 with no later revisions. The design of the new methodology aims at simplifying and updating and, last but not least, imitating the success of already implemented methodology for testing resistance to green algae growth. The proposed methodology was successfully verified on both standards and real samples.
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